Repair manual
Wiring diagrams
Chevrolet Forward Control P30 Repair Manual
Step-by-step repair and maintenance instructions for the Chevrolet Forward Control P30 (1985–1999): removal, installation, adjustment, diagnostics and parameter checks with illustrations.
- APPLICATION
- VEHICLE CODE DESIGNATION
- DESCRIPTION
- OPERATION
- PCM/TCM
- SENSORS & SWITCHES
- Shift Solenoids "A" & "B"
- Force Motor
- TCC Solenoid
- SELF-DIAGNOSTICS
- ELECTRONIC SELF-DIAGNOSTICS
- RETRIEVING CODES (WITH "SCAN" TOOL)
- TROUBLE CODE DEFINITION
- HARD OR INTERMITTENT TROUBLE CODE DETERMINATION
- CLEARING TROUBLE CODES
- DIAGNOSTIC CHARTS
- Diagnostic Aids
- CODE 15 - COOLANT TEMPERATURE SENSOR LOW TEMPERATURE INDICATED (SIGNAL VOLTAGE HIGH)
- CODE 22 - THROTTLE POSITION SENSOR SIGNAL VOLTAGE LOW
- Intermittents
- ELECTRONIC TESTING
- CLUTCH & BAND APPLICATION CHART
- THM 3T40 APPLICATION
- THM 4L60/700-R4 APPLICATION (1991-92)
- THM 4T60 & 4T60-E APPLICATION (1991-92)
- THM 4L80-E APPLICATION
- THM 4L80-E SERIES CODE DESIGNATION
- MP6 & MP7 APPLICATIONS (1991-92)
- DIAGNOSTIC FLOW
- DESCRIPTION
- TCC CONTROL COMPONENTS
- Brake Switch
- Coolant Temperature Sensor
- Electronic Control Module (ECM)
- TCC Solenoid Assembly
- Throttle Position Sensor (TPS)
- Vacuum Sensor
- Vehicle Speed Sensor (VSS)
- 3rd & 4th Gear Switches
- TROUBLE SHOOTING
- Problem In Electronic Control Module
- Electrical Problems
- Valve Body Assembly
- Oil Pump Assembly
- CONVERTER CLUTCH APPLY SLIPS, ROUGH OR SHUDDERS
- CONVERTER CLUTCH DOES NOT RELEASE
- DIAGNOSTIC TOOLS
- RETRIEVING TROUBLE CODES
- CLEARING TROUBLE CODES (EXCEPT SATURN)
- CLEARING TROUBLE CODES (SATURN)
- ENTERING SELF-DIAGNOSTICS
- EXITING SELF-DIAGNOSTICS
- DISPLAYING TROUBLE CODES
- CLEARING TROUBLE CODES
- SYSTEM SELECTION
- TEST TYPE SELECTION
- CLEAR CODES
- DATA
- INPUTS
- OUTPUTS
- OVERRIDE
- SNAPSHOT
- EXPLANATION OF SPECIFIC TEST SELECTION
- SPECIFIC TEST SELECTION
- BCM Snapshot
- ECM Snapshot
- STATUS LIGHT INDICATORS
- ECM
- HIGH
- MED
- LOW
- OFF or VENT
- Left-Side AUTO
- °C
- Upper Arrow (Icon)
- BCM
- Lower Arrow (Icon)
- TCC LOCK-UP PROBLEMS
- NO LOCK-UP CONDITION
- BRAKE SWITCH TEST
- CHECKING SELF-DIAGNOSTIC SYSTEM
- TCC APPLY SOLENOID TEST
- NO TCC RELEASE CONDITION
- CHECKING VOLTAGE TO TERMINAL "A" AT TRANSMISSION USING ALDL
- CHECKING VOLTAGE TO TERMINAL "A" AT TRANSMISSION
- CHECKING FOR GROUND AT TERMINAL "D" AT TRANS. USING ALDL
- CHECKING FOR GROUND AT TERMINAL "D" AT TRANSMISSION
- COOLER LINE PRESSURE TEST
- ELECTRICAL SWITCHES TEST
- Single Terminal Switch (8642473) & 2 Terminal Switch
- Single Terminal Switch (8642569 & 8634475) & 2 Terminal
- GROUNDING "D" WIRE AT TRANSMISSION USING ALDL
- SELF-DIAGNOSTIC SYSTEM CHECK REATTA & RIVIERA
- Always Start Electrical Or Electronic Diagnosis Here
- Diagnostic Aids
- CHART A-2, SERVICE ENGINE SOON LIGHT WON'T GO OUT OR FLASH (REATTA & RIVIERA)
- CHART B-1, BCM POWER & GROUNDS - REATTA & RIVIERA
- CHART C, ECCP DISPLAY PROBLEMS (LOSS OF ECCP COMMUNICATIONS) (REATTA & RIVIERA)
- CHART D-2, SERIAL DATA CIRCUIT SHORTED TO VOLTAGE - REATTA & RIVIERA
- CHART A-2, SERVICE ENGINE SOON LIGHT WILL NOT GO OUT OR FLASH - TORONADO & TROFEO
- SELF-DIAGNOSTIC SYSTEM CHECK (NON-CRT TORONADO & TROFEO)
- CHART C, LOSS OF ECCP COMMUNICATIONS (NON-CRT EQUIPPED TORONADO & TROFEO)
- CHART D, LOSS OF COMMUNICATIONS (NON-CRT EQUIPPED TORONADO & TROFEO)
- CHART D-2, SERIAL DATA CIRCUIT SHORTED TO VOLTAGE (NON-CRT EQUIPPED TORONADO & TROFEO)
- CHART C, COLOR CRT UNABLE TO CONTROL ECCP (CRT EQUIPPED TORONADO & TROFEO)
- CHART D, SERIAL DATA CIRCUIT OPEN (CRT EQUIPPED TORONADO & TROFEO)
- CHART D-1, GROUNDED SERIAL DATA CIRCUIT (CRT EQUIPPED TORONADO & TROFEO)
- CHART E, COLOR CRT ABNORMALITIES (CRT EQUIPPED TORONADO & TROFEO)
- Note On Intermittents
- CODE 23, MAT SENSOR SIGNAL VOLTAGE HIGH
- CODE 26, DIAGNOSTIC CIRCUIT CHECK
- SERVICE ENGINE SOON LIGHT INOPERATIVE
- SERVICE ENGINE SOON LIGHT WON'T GO OUT OR FLASH CODE 12
- Hot Light Diagnosis
- QDM CIRCUITS
- Hot Light Diagnosis (C Body)
- CODE 27 OR 28, GEAR SWITCH CIRCUITS - 3.3L WITH 3T40 TRANSAXLE
- CODE 28 OR 29, GEAR SWITCH CIRCUITS - 3.3L A BODY WITH 4T60
- CODE 31, PARK/NEUTRAL SWITCH CIRCUIT - 3.3L & 3.8L
- Poor Connection or Damaged Harness
- Intermittent Test
- CODE 39, TCC CIRCUIT 3.3L WITH 3T40 TRANSAXLE
- CODE 39, TCC CIRCUIT 3.3L & 3.8L WITH 4T60 (440-T4) TRANSAXLE
- CHART C-8, TORQUE CONVERTER CLUTCH ELECTRICAL DIAGNOSIS - 3.1L PFI A & J BODIES (2 OF 2)
- 1st Gear
- 2nd Gear
- 3rd Gear
- CHART C-8C, 4T60 TRANSAXLE 1ST GEAR SWITCH ELECTRICAL DIAGNOSIS - 3.4L PFI W BODY
- CHART C-8B, 4T60 TRANSAXLE SHIFT SOLENOID FUNCTIONAL CHECK - 1991 E BODY (EXCEPT ELDORADO) 3.8L PFI (VIN L)
- Transaxle Prefunctional Check
- No Indicator Lights On Or Ignition Indicator Light Only On
- Battery Indicator Light On, All Other Indicator Lights Off
- Brake Indicator Light Not On
- Shift "A" And/Or Shift "B" Indicator lights Not On
- Converter Clutch Apply Indicator Light On All The Time
- Converter Clutch MOD Indicator Light On All the Time
- CHART C-8B, 4T60 TRANSAXLE SHIFT SOLENOID FUNCTIONAL CHECK - 3.8L PFI (VIN L & 1) 1992
- CHART C-8A, TORQUE CONVERTER CLUTCH FUNCTIONAL CHECK - 1992 3.8L PFI (VIN 1)
- CHART C-8B, 4T60 TRANSAXLE SHIFT SOLENOID FUNCTIONAL CHECK - 1992 3.8L PFI (VIN 1)
- Diagnostics Aids
- CODE 23, MAT SENSOR TEMP. LOW - 1991 2.5L & 4.3L TURBO
- CODE 25, MAT SENSOR TEMP. HIGH - 1991 2.5L & 4.3L TURBO
- CODE 25, MAT SENSOR TEMP. HIGH - 1992 2.5L & 4.3L TURBO
- CODE 53, SYSTEM VOLTAGE HIGH - LT. TRUCK
- Notes On Intermittents
- CODE 59, TRANSMISSION TEMPERATURE SENSOR CIRCUIT (LOW TEMPERATURE INDICATED) - LT. TRUCK
- CODE 75, SYSTEM VOLTAGE LOW - LT. TRUCK
- CODE 83, TCC QDM FAULT - LT. TRUCK
- CODE 86, SHIFT SOLENOID "B" STUCK "ON" - LT. TRUCK
- CODE 87, SHIFT SOLENOID "B" STUCK "OFF" - LT. TRUCK
- TORQUE CONVERTER CLUTCH CIRCUIT CHECK - LT. TRUCK
- SHIFT SOLENOID "A" CIRCUIT CHECK - LT. TRUCK
- SHIFT SOLENOID "B" CIRCUIT CHECK - LT. TRUCK
- FORCE MOTOR CIRCUIT CHECK (LT. TRUCK)