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E4OD Controls & Solenoids (4R70W similar)
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Powertrain Control Module (PCM) 12A650
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Description: On vehicles equipped with gasoline engines, the operation of the E4OD automatic transmission is controlled by the EEC-IV powertrain control module. Many input sensors provide information to the powertrain control module, which then controls the actuators that affect transmission operation.
On vehicles equipped with diesel engines, the operation of the E4OD automatic transmission is also controlled by the powertrain control module. However, some of the input sensors are different.

Air Conditioning (A/C) Clutch 2884:

Description: The air conditioning clutch is an electromagnetic clutch that is energized when the clutch cycling A/C pressure cut-off switch closes. The A/C pressure cut-off switch is located on the suction accumulator-drier. The closing of the A/C pressure cut-off switch completes the circuit to the clutch and draws it into engagement with the compressor driveshaft. Used as an input to determine electronic pressure control when the air conditioning clutch is engaged to compensate for the additional load on the engine.
Symptoms: Failed on - electronic pressure control slightly low with A/C off. Failed off - electronic pressure control slightly high with A/C on.
Diagnostic Trouble Codes: 539, P1460, P1463, P1464.

Brake On/Off (BOO) Switch 13480:
Description: The brake on/off switch tells the powertrain control module when the brakes are applied. The switch is closed when the brakes are applied and open when they are released. The PCM uses this signal to disengage torque converter clutch when brake is applied.
Symptoms: Failed on or not connected or all LED bulbs or all bulbs removed/burned out - Torque converter clutch will not engage at less than 1/3 throttle. Failed off - Torque converter clutch will not disengage when brake is applied.
Diagnostic Trouble Codes: 536, P1703.

Distributor Ignition (DI) System:
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Description: On gasoline engines, the profile ignition pickup sensor sends a signal to the powertrain control module indicating the engine rpm and the crankshaft position.
Symptoms: Engine will stall or miss.
Diagnostic Trouble Codes: 211, P0340, P0341, P0344.

Camshaft Position (CMP) Sensor 7.3L DI Diesel Only:
Description: On the 7.3L DI diesel engines, the CMP sensor provides engine rpm information to the PCM. This rpm input is used to determine shift scheduling and EPC pressure.
Symptoms: No start.
Diagnostic Trouble Codes: P0340, P0341, P0344

4x4 Low (4x4L) Switch:

Description: The low range switch is located on the transfer case cover. It provides an indication of when the 4x4 transfer case gear system is in the LOW range. Modifies shift schedule for 4x4L transfer case gear ratio.
Symptoms: Failed on - Early shift schedule in 4x2 and 4x4H. Failed off - Shifts delayed in 4x4L. If the 4x4 low indicator light fuse is blown, the transmission will shift according to 4x4 low shift schedule regardless of transfer case position.
Diagnostic Trouble Codes: 633, 691, P1729, P1781.

Mass Air Flow (MAF) Sensor 12B579:

Description: The mass air flow sensor directly measures the mass of air flowing into the engine. The sensor output is a D.C. (analog) signal ranging from 0.5 volt to 5 volts used by the processor to calculate injector pulse width. Used as an input to determine electronic pressure control.
Symptoms: High electronic pressure, firm shifts and engagements.
Diagnostic Trouble Codes: 157, 158, 159, 184, 185, P0102, P0103, P1100, P1101.

Manifold Absolute Pressure (MAP) Sensor Gasoline Engines:
Description: On gasoline engines, the manifold absolute pressure (MAP) sensor senses atmospheric pressure to produce an electrical signal. The frequency of this signal varies with intake manifold pressure. The powertrain control module monitors this signal to determine altitude. The PCM then adjusts the E4OD shift schedule and EPC pressure for altitude.
On diesel engines, the MAP sensor measures boost pressure. The PCM monitors this signal and adjusts EPC pressure.
Symptoms: Firm shift feel, late shifts at altitude.
Diagnostic Trouble Codes: 126-129, P0235-P0237.

Barometric Pressure (BARO) Sensor 7.3L DI Diesel Only:
Description: The barometric pressure sensor operates similarly to the manifold absolute pressure sensor. It measures barometric pressure instead of intake manifold pressure. The powertrain control module uses the signal from the barometric pressure sensor to determine the altitude at which the vehicle is operating. The powertrain control module then adjusts the E4OD shift schedule and EPC pressure for the altitude.
Symptoms: Firm shift feel, late shifts at altitude.
Diagnostic Trouble Codes: P0107, P0108.

Programmable Speedometer/Odometer Module (PSOM):

Description: The programmable speedometer/odometer module receives input from the rear brake anti-lock sensor (ABS), which is mounted on the rear axle differential housing. The PSOM processes this input signal information and relays it as a vehicle speed signal (VSS) to the powertrain control module and the speed (cruise) control module. This signal tells the powertrain control module the vehicle speed in miles per hour (mph). Used as an input in determining shift scheduling and electronic pressure control.
Symptoms: Harsh engagements, firm shift feel, abnormal shift schedule, unexpected downshifts may occur at closed throttle, abnormal torque converter clutch operation or engages only at wide-open throttle (WOT). May flash transmission control indicator lamp.
Diagnostic Trouble Codes: 452, P0500, P1500, P1501, P0503.

Transmission Control Switch (TCS) and Transmission Control Indicator Lamp (TCIL):
Description: The transmission control switch (TCS) is a momentary contact switch. When the switch is pressed, a signal is sent to the powertrain control module. The powertrain control module then energizes the transmission control indicator lamp and the coast clutch solenoid, applying the coast clutch to provide engine braking and cancels fourth gear operation. The TCIL indicates overdrive cancel mode activated (lamp on), electronic pressure control circuit shorted or monitored sensor failure (lamp flashing).
Sensor: Transmission Control Switch.
Symptoms: No overdrive cancel when switch is cycled.
Diagnostic Trouble Codes: 632, P1780, tested during Key On Engine Off (KOEO) On-Board Diagnostic only.
Actuator: Transmission Control Indicator Lamp.
Symptoms: Failed on overdrive cancel mode always indicated, no flashing for electronic pressure control circuit shorted. Failed off overdrive cancel mode never indicated, no flashing for electronic pressure control circuit shorted, also may be due to a bad fuse. Erratic operation (flashing) may be due to a wiring concern.
Diagnostic Trouble Codes: 631, P1779.

Throttle Position (TP) Sensor 9B989:

Description: The throttle position sensor is a potentiometer that is mounted on the throttle body on gas applications and on the fuel injection pump lever on diesel applications. The throttle position sensor detects the position of the throttle plate or lever and sends this information as a voltage signal to the powertrain control module.
If a malfunction occurs in the throttle position sensor circuit, the powertrain control module will recognize that the throttle position sensor signal is out of specification. The powertrain control module will then operate the E4OD transmission at a higher line pressure to prevent transmission damage. This high line pressure causes harsh upshift and engagements. Used as an input to determine shift scheduling and electronic pressure control.
Symptoms: Harsh engagements, firm shift feel, abnormal shift schedule, abnormal or no torque converter clutch operation. May flash transmission control indicator lamp.
Diagnostic Trouble Codes: 121, 122, 123, 124, 125, 167, P0121, P0122, P0123, P1120, P1121, P1124, P1125.

Accelerator Pedal (AP) Sensor 7.3L DI Diesel Only:

Description: The accelerator pedal (AP) sensor is mounted on the accelerator pedal on 7.3L DI diesel engines. The AP sensor detects the position of the accelerator pedal and sends this information as a voltage signal to the PCM.
If a malfunction occurs in the AP sensor circuit, the powertrain control module will recognize that the AP sensor signal is out of specification. The powertrain control module will then operate the E4OD transmission at a higher line pressure to prevent transmission damage. This high line pressure causes harsh upshift and engagements. Used as an input to determine shift scheduling and electronic pressure control.
Symptoms: Harsh engagements, firm shift feel, abnormal shift schedule, abnormal or no torque converter clutch operation. May flash transmission control indicator lamp.
Diagnostic Trouble Codes: 122, 123, P0122, P0123

Antilock Brake Sensor (ABS) 9E731:
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Description: The antilock brake sensor is a variable reluctance sensor that sends an AC/frequency signal to the programmable speedometer/odometer module (PSOM) which uses the signal to calculate vehicle speed in mph and output a vehicle speed signal (VSS) used by other systems. Used as an input in determining shift scheduling and electronic pressure control.
Symptoms: Harsh engagements, firm shift feel, abnormal shift schedule; unexpected downshifts may occur at closed throttle, abnormal torque converter clutch operation or torque converter clutch engages only at wide-open throttle. May flash transmission control indicator lamp.
Diagnostic Trouble Codes: 452, P0500, P1500, P1501, P0503.

Transmission Fluid Temperature (TFT) Sensor:
Description: The transmission fluid temperature sensor is located on the solenoid body assembly in the transmission sump. It is a temperature-sensitive device called a thermistor. The resistance value of the transmission fluid temperature sensor will vary with temperature change. The powertrain control module monitors voltage across the transmission fluid temperature sensor to determine the temperature of the transmission fluid. The powertrain control module uses this signal to determine whether a cold start shift schedule is necessary. The cold start shift schedule lowers shift speeds to allow for the reduced performance of cold engine operation. The powertrain control module also uses the transmission fluid temperature sensor input to adjust electronic pressure control pressure for temperature effects and inhibit torque converter clutch operation during the warm-up period.
Symptoms: Torque converter clutch and stabilized shift schedule happens too soon after a cold start. Codes P1783 or 657 indicate transmission fluid temperature exceeds 132%uFFFDC (270%uFFFD F), results in increased EPC pressure and torque converter clutch engagement. May flash transmission control indicator lamp.
Diagnostic Trouble Codes: 636, 637, 638, 657, P0712, P0713, P1711, P1783.

Transmission Range (TR)/Manual Lever Position (MLP) Sensor 7A247:
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Description: The powertrain control module sends voltage to the Transmission Range (TR) sensor (aka MLPS). The TR sensor incorporates a series of step-down resistors which act as a voltage divider. The powertrain control module monitors this voltage which corresponds to the position of the gearshift selector lever (P, R, N, (D), 2 or 1). The powertrain control module uses this information to determine the desired gear and electronic pressure control pressure. The TR sensor is located on the outside of the transmission at the gearshift selector lever.
Symptoms: Harsh engagements, firm shift feel.
Diagnostic Trouble Codes: 634, 654, 667, 668, P0705, P0707, P0708, P1705.

Transmission Solenoid Body:
Description: The powertrain control module controls the E4OD transmission operation through four on/off solenoids and one Variable Force Solenoid. These solenoids and transmission fluid temperature sensor are housed in the transmission solenoid body assembly. All are part of the transmission solenoid body and are not serviced individually. Additionally, in 1995, the protection diodes that were on the solenoid body have been moved to the PCM. Refer to the following information for the functions of these solenoids.

The four on/off solenoids operate in the following manner:
When the solenoid is off, the fluid pressure feed is blocked by a check ball. The check ball is held in place by the solenoid piston.
When the solenoid is turned on by the PCM, the piston is pulled up, releasing the check ball and allowing fluid pressure to be applied to the check valves and/or other components controlled by the solenoid.

Electronic Pressure Control (EPC) Solenoid:
Description: The Electronic Pressure Control solenoid is a variable force solenoid. The variable-force type solenoid is an electro-hydraulic actuator combining a solenoid and a regulating valve. It supplies electronic pressure control which regulates transmission line pressure and line modulator pressure. This is done by producing resisting forces to the main regulator and the line modulator circuits. These two pressures control clutch application pressures.
Symptoms: Failed on minimum electronic pressure control pressure (minimum transmission torque capacity). Limit engine torque (partial fuel shut-off, heavy misfire). Flashing transmission control indicator lamp.
Failed off maximum electronic pressure control pressure, harsh engagements and shifts. May flash transmission control indicator lamp.
Diagnostic Trouble Codes: 624,* 625,* P1746,* P1747.*
CAUTION: The electronic pressure control pressure output from the variable force solenoid is NOT adjustable. Any modification to the electronic pressure control solenoid will affect the transmission warranty. (*Output circuit check, generated only by electrical condition.)

Torque Converter Clutch (TCC) Solenoid:
Torque converter clutch solenoid provides torque converter clutch control by shifting the converter clutch control valve to apply or release the torque converter clutch. Early on-off solenoids have ~20 Ohms resistance; later (~'98-up) PWM solenoids have ~2 Ohms.
Symptoms: Failed on engine stalls in drive at idle low speeds with brake applied or manual 2. Failed off converter clutch never engages. May flash transmission control indicator lamp.
Diagnostic Trouble Codes: 629,* P0741,** P0743,** P1743, P1742, P1744. (*Output circuit check, generated only by electrical condition. **May also be generated by other non-electronic related transmission hardware condition.)

Coast Clutch Solenoid (CCS) 7M107:
The Coast Clutch Solenoid provides coast clutch control by shifting the coast clutch shift valve. The solenoid is activated by pressing the transmission control switch or by selecting the 1 or 2 range with the transmission gearshift selector lever. In manual 1 and 2, the coast clutch is controlled by the solenoid and also hydraulically as a fail-safe to ensure engine braking. In reverse, the coast clutch is controlled hydraulically and the solenoid is not on. NOTE: On certain applications, the coast clutch is controlled by the PCM in the overdrive position (TCS OFF) in gears 1, 2, and 3.
Symptoms: Failed on Third gear engine braking with (D) range selected. Failed off No third gear engine braking in overdrive cancel.
Diagnostic Trouble Codes: 626,* 628,** 643,* 652,* P0741,** P0743,* P1754.*
(*Output circuit check, generated only by electrical conditions. **May also be generated by other non-electronic related transmission hardware condition.)

Shift Solenoids 1 and 2:
Shift solenoids 1 and 2 provide gear selection of first through fourth gears by controlling the pressure to the three shift valves.

Shift Solenoid 1:
Symptoms: Improper gear selection depending on failure mode and manual lever position; refer to the Shift Solenoid Operation Chart. May flash transmission control indicator lamp.
Diagnostic Trouble Codes: 617,** 618,** 619,** 621,* P0750,* P0751, P0781,** P0782,** P0783.** (*Output circuit check, generated only by electrical conditions. **May also be generated by other non-electronic related transmission hardware condition.)

Shift Solenoid 2:
Symptoms: Improper gear selection depending on failure mode and manual lever position; refer to the Shift Solenoid Operation Chart. May flash transmission control indicator lamp.
Diagnostic Trouble Codes: 617,** 618,** 619,** 622,* P0755,* P0781,** P0782,** P0783,** P0756. (*Output circuit check, generated only by electrical conditions. **May also be generated by other non-electronic related transmission hardware condition.)
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See also:


According to one of the original E4OD/4R100 engineers: "With the solenoids unplugged you'll have max line pressure. With the shift handle in OD you will only have fourth gear with the torque converter unlocked. If you move the shifter to 2 or 1 you will have second gear. Reverse also works."
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TSB 89-09-18 Introduction to the E4OD

LIGHT TRUCK:
1989 E-250, E-350, F SUPER DUTY, F-250, F-350

ISSUE: The E4OD is a new 4-speed automatic overdrive transmission. The E4OD transmission was derived from the C-6 automatic (3-speed) transmission.

ACTION: Use the following information to familiarize yourself with the various E4OD components. This information can help you explain the operation of the transmission to the customer.

The E4OD uses electronic controls to control shift points, pressure regulation and torque converter clutch control. This provides high quality shifts, good fuel economy and overall performance. The engine and transmission are monitored with diagnostic testing available through the EEC-IV Quick Test. The E4OD operations are provided by both operator selected positions of the manual selector lever and with an overdrive cancel switch located on the instrument panel.

FUNCTIONS

P (Park), R (Reverse), and N (Neutral) are the same as other Ford automatic transmissions.

D (Overdrive - normal driving position) provides all automatic shifts through fourth gear (overdrive) along with application and release of the converter clutch. The transmission may also be shifted manually between all forward ranges.

D (Overdrive - with overdrive cancel switch activated, amber light on. This position is selected by pushing the button on the instrument panel, or shift stalk on later models.) provides all automatic shifts, including the application and release of the converter clutch, except the shift into overdrive. It is used to provide additional engine braking for descending grades.

2 (Manual second) provides only second gear operation regardless of vehicle speed. It is useful for start-up on slippery surfaces or to provide engine braking on downgrades.

1 (Manual low) provides only low (1st) gear at start-ups. At higher speeds it results in a downshift to second gear followed by an automatic downshift to low which occurs when vehicle speed decreases enough. Once in low, the transmission will stay in low until the selector is moved to another position.

ELECTRONIC CONTROL
The E4OD is electronically controlled by a microprocessor known as the EEC-IV processor (electronic control assembly, ECA). The EEC-IV processor controls both the engine and the transmission on gasoline engine applications in the same microprocessor. On diesels the ECA controls the transmission only. Electronic control also provides powertrain system diagnostic capabilities which will result in earlier and more accurate resolution of E4OD malfunctions. Service technicians can detect many types of transmission concerns if they occur during the standard EEC-IV "Quick Test" on both gas and diesel use. Additionally, the overdrive cancel switch indicator light will flash during certain conditions which will inform the driver to go to a Ford dealer for servicing.

The processor gathers information from sensors located throughout the vehicle which are monitoring vehicle operating conditions. Using this information, the processor determines the best operating state for the transmission. A solenoid body assembly, containing five solenoids, receives the processor signals which in turn produces the desired mode of operation.

Altitude compensation for shift quality and cold ambient warm-up strategy are also provided in the electronic controls. This eliminates the need for changes to the transmission for operating in mountainous regions. It also allows the E4OD to operate effectively even in extreme cold.

An overdrive cancel switch allows lockout of overdrive with the push of a button. The switch is located on the instrument panel and is useful for providing increased engine braking on downhill grades. Depressing the switch will lock out overdrive (amber light turns on). Pressing it again, will change the system back to normal operation. Whenever the ignition key is turned on, the vehicle will automatically provide overdrive operation regardless of the switch position the last time the vehicle was running.

FUNCTIONAL COMPONENTS
Components from the intermediate brake drum rearward to the output shaft and extension housing seal are similar to the C-6 automatic transmission. However, the E4OD planetary gears have a higher contact ratio for quieter operation. Forward of the intermediate brake drum, the E4OD components are new. These new parts are:
> Center support assembly
> Overdrive ring gear
> Coast clutch
> Overdrive sun gear and planet gear assembly
> Pump and support assembly
> Converter and clutch/damper assembly

The E4OD has wider forward gear ratios than the C-6 as shown below.

Gear - C6 - E4OD
1st - 2.46 - 2.71
2nd - 1.46 - 1.538
3rd - 1.00 - 1.00
OD - NA - 0.712
Rev - 2.18 - 2.18

Currently there are 12 E4OD models for use in F-250/350 (4x2 and 4x4), Econoline (5.8L/7.3L Diesel/7.5L) and F Super Duty (7.3L Diesel/7.5L). For details in diagnosing, testing, disassembling and assembling, see Section 17-09 of the 1989 Truck Shop Manual. Also see the E4OD Theory and Diagnosis Technical Training Manual (Order No. 1710-012). The E4OD, like the C-6, is filled with Mercon fluid. The fluid should be changed every 30,000 miles for severe service use. See this PDF for proper fluid application.
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E4OD TSBs:

98-16-08 TRANSMISSION - E4OD/4R100 - 1989-99 - MAIN CONTROLS, SEPARATOR PLATES AND SEPARATOR PLATE GASKETS USAGE CHART

98-16-07 TRANSMISSION - E4OD - NO 2-3 UPSHIFT

98-13-21 TRANSMISSION - E4OD - SERVICE CASE REPLACEMENT SERVICE TIPS FOR 7.3L DIESEL VEHICLE APPLICATIONS

98-04-19 LAMP - FLASHING TRANSMISSION CONTROL INDICATOR LAMP (TCIL) WITH DIAGNOSTIC TROUBLE CODES (DTCS) 62, 628 AND/OR 1728 STORED IN MEMORY
TRANSMISSION - E4OD - FLASHING TRANSMISSION CONTROL INDICATOR LAMP (TCIL) WITH DIAGNOSTIC TROUBLE CODES (DTCS) 62, 628 AND/OR 1728 STORED IN MEMORY

97-19-20 TRANSMISSION - E4OD - MAIN REGULATOR BOOSTER VALVE AND SLEEVE SERVICE KIT - SERVICE TIP

97-12-13 TRANSMISSION - C6, E4OD, AOD, 4R70W - LOW TRANSMISSION FLUID LEVEL AND/OR SHIFT AND/OR ENGAGEMENT CONCERNS - 4X4 AND AWD VEHICLES ONLY

96-07-28 TRANSMISSION - E4OD - REVERSE CLUTCH PISTON AND PISTON SEAL USAGE - SERVICE TIP

95-25-13 TRANSMISSION - E4OD - DIRECT CLUTCH PLATE USAGE CHART - SERVICE TIP

95-23-14 TRANSMISSION - E4OD - NEW DESIGN INTERMEDIATE BAND APPLY SERVO ASSEMBLY

95-16-19 TRANSMISSION - E4OD - INTERMEDIATE BRAKE DRUM ASSEMBLY USAGE - SERVICE TIP

95-13-07 TRANSMISSION - E4OD - HARSH AND/OR DOUBLE BUMP ON REVERSE ENGAGEMENT - VEHICLES WITH 4.9L ENGINE ONLY

95-11-13 TRANSMISSION - E4OD - DELAYED FORWARD ENGAGEMENT AND/OR HEAT STAINED FORWARD CLUTCH PLATES AFTER INSTALLING CENTER SUPPORT SERVICE KIT F4TZ-7A130-B

95-11-12 TRANSMISSION - E4OD - REVISED REAR CASE BUSHING

95-06-19 TRANSMISSION - E4OD - NEW DESIGN TRANSMISSION RANGE SENSOR (TR) AND CONNECTOR INCLUDED WITH ALL E4OD REMANUFACTURED TRANSMISSIONS

95-06-18 TRANSMISSION - E4OD - OVERDRIVE ONE-WAY CLUTCH - SERVICE TIPS

95-02-12 TRANSMISSION - E4OD - DIAGNOSTIC TROUBLE CODES - WATER INTRUSION OF THE MLP/TR SENSOR
TRANSMISSION - E4OD - POSSIBLE WATER INTRUSION INTO THE MLP/TR SENSOR CAUSING SHIFT CONCERNS AND/OR HARSH ENGAGEMENT CONCERNS
TRANSMISSION - E4OD - SHIFT CONCERNS AND/OR HARSH ENGAGEMENT CONCERNS DUE TO WATER INTRUSION OF THE MLP/TR SENSOR

94-24-15 TRANSMISSION - E4OD - UPGRADE - BALL BEARING CENTER SUPPORT SERVICE KIT

94-23-18 TRANSMISSION - E4OD - EXCESSIVE BUSHING WEAR - LOW ONE-WAY CLUTCH MALFUNCTION
TRANSMISSION - E4OD - FORWARD CLUTCH WEAR
TRANSMISSION - E4OD - OVERHEATING - CONVERTER COVER DISCOLORATION, CLUTCHES BURNED, BURNT FLUID
TRANSMISSION - E4OD - UPGRADED COMPONENTS TO BE INSTALLED DURING TEARDOWN

94-21-14 TRANSMISSION - E4OD - VEHICLE DOES NOT MOVE - DIAGNOSIS AND SERVICE TIPS

94-21-13 TRANSMISSION - E4OD - UPGRADED OVERDRIVE PLANET ASSEMBLY AND INPUT SHAFT WHEN REPLACEMENT OF EITHER BECOMES NECESSARY

94-11-08 E4OD TRANSMISSION/ATX TRANSAXLE - EXCHANGE REQUIRED WHEN REPAIR COST EXCEEDS $1,300 FOR E4OD OR $1,100 FOR ATX
TRANSMISSION - E4OD/ATX - EXCHANGE PROGRAM INCREASES AVAILABILITY OF REMANUFACTURED UNITS - E & F SERIES LIGHT TRUCKS EQUIPPED WITH E4OD TRANSMISSIONS, TAURUS WITH 2.5L ENGINES, TEMPO/TOPAZ WITH 2.3L HSC/HSO ENGINES

94-09-13 HEATER - "GURGLING" NOISE FROM CORE AT COLD START - VEHICLES WITH E4OD TRANSMISSION
NOISE - "GURGLING" SOUND FROM HEATER CORE AT COLD START - VEHICLES WITH E4OD TRANSMISSION

94-08-20 TRANSMISSION - E4OD AND C-6 - INSTALLATION INSTRUCTIONS FOR "NEW UNITIZED PLASTIC CAGE" LOW ONE-WAY CLUTCH - 1989-94 MODELS WITH E4OD AND ALL MODEL YEARS WITH C-6
TRANSMISSION - E4OD AND C-6 - NO FORWARD ENGAGEMENT - SERVICE TIPS FOR INSTALLING "NEW UNITIZED PLASTIC CAGE" LOW ONE-WAY CLUTCH - 1989-94 MODELS WITH E4OD AND ALL MODEL YEARS WITH C-6

94-02-25 TRANSMISSIONS - C-6, E4OD, AOD - DIFFICULT OR IMPOSSIBLE TO SHIFT - CABLE BINDS DUE TO ENVIRONMENTAL EXPOSURE

93-19-11 SHEET METAL - CAB BACK PANEL "BOOM" NOISE - VEHICLES WITH 4.9L ENGINE AND E4OD OR C6 TRANSMISSION
NOISE - "BOOM" FROM CAB BACK PANEL - VEHICLES WITH 4.9L ENGINE AND E4OD OR C6 TRANSMISSION

93-12-16 NOISE - "CLUNK" - WHEN MOVING THE E4OD TRANSMISSION SELECTOR LEVER TO ENGAGE TRANSMISSION RANGES
TRANSMISSION - E4OD - "CLUNK" NOISE WHEN MOVING THE TRANSMISSION SELECTOR LEVER TO ENGAGE TRANSMISSION RANGES

93-08-14 LAMP - "MALFUNCTION INDICATOR LAMP" - ON AND CODE 41 (HEGO INDICATING RICH/LEAN) IN CONTINUOUS MEMORY - 7.5L WITH E4OD TRANSMISSION

93-07-07 SURGE - 5.0L - ON ACCELERATION OR STEADY SPEED BELOW 35 MPH (56 KMH) - CALIFORNIA CALIBRATIONS WITH E4OD

92-22-05 BRAKES - REAR ANTI-LOCK BRAKE SYSTEM ELECTRONICS INOPERATIVE - VEHICLES WITH E4OD TRANSMISSION
INSTRUMENT CLUSTER - LOSS OF INSTRUMENTATION GAUGES - VEHICLES WITH E4OD TRANSMISSION
LAMP - TRANSMISSION CONTROL LIGHT CYCLES ON/OFF OR CONTROL SWITCH INOPERATIVE - VEHICLES WITH E4OD TRANSMISSION
WIRING - E4OD TRANSMISSION CONTROL SWITCH - SHORTS IN STEERING COLUMN AND BLOWS #17 FUSE
TRANSMISSION - E4OD - CONTROL SWITCH WIRING SHORTS IN STEERING COLUMN AND BLOWS #17 FUSE
TRANSMISSION - E4OD - EARLY SHIFTS, LOSS OF POWER, POOR ACCELERATION AND 3-4 SHIFT CYCLING

92-18-12 LAMP - "MALFUNCTIONING INDICATOR LAMP" - ON AND CODE 173 (HEGO INDICATING RICH) IN CONTINUOUS MEMORY - 5.8L WITH E4OD TRANSMISSION

92-15-13 LAMP - "CHECK ENGINE" MALFUNCTION INDICATOR LIGHT (MIL) LIT - SERVICE CODE 173 IN CONTINUOUS MEMORY - VEHICLES WITH 5.0L AND E4OD

92-09-13 MISS - 4.9L - RANDOM MISFIRE - VEHICLES WITH AUTOMATIC OR MANUAL TRANSMISSION
STALL - 4.9L - DURING TRANSMISSION GEAR ENGAGEMENT - E4OD ONLY
LATE GEAR SHIFTS AND ENGINE MISS

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