Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1987HI-CUBE 6.2 J, 475/M40REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 45 (DIAGNOSIS - A/T)
1987 Chevrolet Hi-Cube 6.2 J, 475/M40
Section 45 (Diagnosis - A/T)
1987 Chevrolet Hi-Cube 6.2 J, 475/M40SECTION Section 45 (Diagnosis - A/T)
WARNING: This page does not describe the selected car, but rather 138 other vehicles, including the 1992 Saturn SL2, 1992 Saturn SL1, 1992 Saturn SL, 1992 Saturn SC, and 1992 Pontiac Trans Sport. However, it is still accessible from the selected car via links, so may be relevant.
- Application
- Diagnostic Flow
- Description
- Trouble Shooting
- Testing & Diagnosis (Exc. REATTA, Riviera, TORONADO & TROFEO)
- Testing & Diagnosis (REATTA, Riviera, TORONADO & TROFEO)
- Service Bulletins
- 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
- Grounding "D" Wire At Transmission Using ALDL
- Diagnostic Flow Charts (Cars)
- Self-Diagnostic System Check REATTA & Riviera
- Chart A-1, No Service Engine Soon Light - REATTA & Riviera
- Chart A-2, Service Engine Soon Light Won't Go Out Or Flash (REATTA & Riviera)
- Chart A, Blank Odometer Display - REATTA & Riviera
- Chart B, Odometer Displays Error (LOS Of Serial Data) (REATTA & Riviera)
- Chart B-1, BCM Power & Grounds - REATTA & Riviera
- Chart C, ECCP Display Problems (Loss Of ECCP Communications) (REATTA & Riviera)
- Chart D-1, Grounded Serial Data Circuit - REATTA & Riviera
- Chart D-2, Serial Data Circuit Shorted To Voltage - REATTA & Riviera
- Code B556, Odometer (Ee) Prom Error - REATTA & Riviera
- Chart A-1, No Service Engine Soon Light - TORONADO & TROFEO
- Chart A-2, Service Engine Soon Light Will Not Go Out Or Flash - TORONADO & TROFEO
- Self-Diagnostic System Check (Non-CRT TORONADO & TROFEO)
- Chart A, Loss Of IPC Display (Non-CRT Equipped) TORONADO & TROFEO
- Chart B, Loss Of Serial Data (Non-CRT Equipped 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-1, Grounded Serial Data Circuit (Non-CRT Equipped TORONADO & TROFEO)
- Chart D-2, Serial Data Circuit Shorted To Voltage (Non-CRT Equipped TORONADO & TROFEO)
- Self-Diagnostic System Check (CRT Equipped TORONADO & TROFEO)
- Chart A, Loss Of IPC Display (CRT Equipped TORONADO & TROFEO)
- Chart B, Color CRT Blank With Ignition On (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 D-2, Serial Data Circuit Shorted To Voltage (CRT Equipped TORONADO & TROFEO)
- Chart E, Color CRT Abnormalities (CRT Equipped TORONADO & TROFEO)
- Code B127, Gear Selector Switch Circuit
- Code 23, Mat Sensor Signal Voltage High
- Code 24, Vehicle Speed Sensor (A, F, J, L, N, W & Y Bodies)
- Code 24, Vehicle Speed Sensor (VSS) 2.2L J Body (1991)
- Code 24, Vehicle Speed Sensor (VSS) 5.0L & 5.7L TBI B, D & F Bodies
- Code 24, Vehicle Speed Sensor (VSS) SATURN (1991-92)
- Code 25, Mat Sensor Signal Voltage Low
- Code 26, Diagnostic Circuit Check
- Service Engine Soon Light Inoperative
- Service Engine Soon Light Won't Go Out Or Flash Code 12
- Code 26, Quad-Driver Circuit 3.8L W Body
- Code 26, Quad-Driver Circuit - 3.8L H Body
- Code 26, Quad-Driver Circuit - 3.3L A & N Bodies
- Code 26, Quad-Driver Circuit 3.8L C & E Bodies
- 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 27, 28 Or 29 Gear Switch Circuits - 3.8L
- Code 31, Park/Neutral Switch Circuit - 3.3L & 3.8L
- Code 31, Park/Neutral Switch Circuit - 3.8L PFI (VIN L)
- Code 31, Park/Neutral Switch Circuit - 3.3L PFI (VIN N)
- Code 36, Shift Control Problem - 3.8L C & E Bodies W/4T60E Transaxle
- Code 38, Brake Switch Circuit - 3.3L & 3.8L
- Code 39, TCC Circuit 3.3L With 3T40 Transaxle
- Code 39, TCC Circuit 3.3L & 3.8L With 4T60 (440-T4) Transaxle
- Code 38, Brake Switch Circuit - 3.3L PFI N Body
- Chart C-1A, Park/Neutral Switch 1.6L TBI T Body
- Chart C-1A, Park/Neutral Switch - 2.0L & 2.5L TBI & PFI A, J & N Bodies
- Chart C-1A, Park/Neutral Switch - 2.5L TBI W Body
- Chart C-1A, Park/Neutral Switch 2.2L, 2.3L, 3.1L, 3.4L, 5.0L & 5.7L PFI 4.3L, 5.0L & 5.7L TBI A, B, F, J, L, N, W & Y Bodies
- Chart C-8A, Torque Converter Clutch 1.6L & 2.2L TBI T & J Bodies
- Chart C-8A, Torque Converter Clutch Electrical Diagnosis - 2.0L & 2.2L PFI J Bodies
- Chart C-8A, 3T40 Torque Converter Clutch Electrical Diagnosis 2.3L PFI N & W Bodies
- Chart C-8A, Torque Converter Clutch Electrical Diagnosis - 2.5L TBI A & N Bodies
- Chart C-8A, Torque Converter Clutch Electrical Diagnosis 2.5L TBI W Body
- Chart C-8, Torque Converter Clutch Electrical Diagnosis - 3.1L PFI A, J & L Bodies (1 Of 2)
- Chart C-8, Torque Converter Clutch Electrical Diagnosis - 3.1L PFI A & J Bodies (2 Of 2)
- Clutch C-8B, 4T60 Torque Converter Clutch Electrical Diagnosis, 3.1L PFI A & W Bodies
- Chart C-8A, Torque Converter Clutch - 3.1L PFI F Body
- Chart C-8A, 3T40 Torque Converter Clutch Electrical Diagnosis - 3.1L PFI W Body
- Chart C-8A, 3T40 Torque Converter Clutch, 3.3L PFI A Body
- Chart C-8B, 4T60 Torque Converter Clutch Electrical Diagnosis - 3.3L PFI A Body
- Chart C-8A, 3T40 Torque Converter Clutch, 3.3L PFI N Body
- Chart C-8B, 4T60 Transaxle Mode Switch Electrical Diagnosis - 3.4L PFI W Body
- Chart C-8C, 4T60 Transaxle 1ST Gear Switch Electrical Diagnosis - 3.4L PFI W Body
- Chart C-8A, Torque Converter Clutch Electrical Diagnosis - 3.8L PFI C Body
- Chart C-8A, Torque Converter Clutch Electrical Diagnosis - 1991 E Body (Except ELDORADO) 3.8L PFI (VIN L)
- Chart C-8B, 4T60 Transaxle Shift Solenoid Functional Check - 1991 E Body (Except ELDORADO) 3.8L PFI (VIN L)
- Chart C-8A, Torque Converter Clutch Functional Check - 1992 3.8L PFI (VIN L & 1)
- Notes
- Diagnostic Aids
- 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
- Notes
- Diagnostic Aids
- 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-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)
- Chart C-8A, Torque Converter Clutch Electrical Diagnosis - 3.8L PFI (VIN L) W Body
- Chart C-8A, Torque Converter Clutch Electrical Diagnosis - 4.3L, 5.0L & 5.7L TBI B & D Bodies
- Chart C-8A, Torque Converter Clutch Electrical Diagnosis - 5.0L & 5.7L PFI F Body
- Chart C8-A, Torque Converter Clutch Electrical Diagnosis - 1991 5.7L PFI Y Body
- Chart C-8A, Torque Converter Clutch Electrical Diagnosis - 1992 5.7L PFI Y Body
- Diagnostic Code Charts (Trucks)
- Code 23, Mat Sensor Temp. Low - 1991 2.5L & 4.3L Turbo
- Code 23 Mat Sensor Temp. Low - 1992 2.5L & 4.3L Turbo
- Code 24, Vehicle Speed Sensor - Except 3.1L, C & K Series & Models With 4L80-E Transmission
- Code 24, Vehicle Speed Sensor - 1992 Except 4L80-E Trans.
- Code 24, Vehicle Speed Sensor - C & K Series Except W/4L80-E Transmission
- Code 24, Vehicle Speed Sensor - C & K Series 2WD With 4L80-E Transmission
- Code 24, Vehicle Speed Sensor - 1992 With 4L80-E Transmission
- Code 24, Vehicle Speed Sensor - 2WD With 4L80-E Transmission Except C & K Series
- Code 24, Vehicle Speed Sensor - 4WD With 4L80-E Transmission
- Code 24, Vehicle Speed Sensor - 3.1L
- Code 24, Vehicle Speed Sensor - 1991 Diesel
- Code 24, Vehicle Speed Sensor - 1992 6.2L Diesel
- 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 28, Pressure Switch Manifold Fault (LT. Truck)
- Code 39, Torque Converter Clutch Stuck In "Off" Position - LT. Truck
- Code 53, System Voltage High - LT. Truck
- Code 58, Transmission Temperature Sensor Circuit (High Temperature Indicated) - LT. Truck
- Code 59, Transmission Temperature Sensor Circuit (Low Temperature Indicated) - LT. Truck
- Code 68, Overdrive Ratio Error - LT. Truck
- Code 73, Force Motor Current (Current Error) - LT. Truck
- Code 75, System Voltage Low - LT. Truck
- Code 81, QDM Fault Solenoid "B" - LT. Truck
- Code 82, QDM Fault Solenoid "A" - LT. Truck
- Code 83, TCC QDM Fault - LT. Truck
- Code 85, Undefined Ratio - LT. Truck
- Code 86, Shift Solenoid "B" Stuck "On" - LT. Truck
- Code 87, Shift Solenoid "B" Stuck "Off" - LT. Truck
- Park/Neutral Switch Test (Trucks)
- Torque Converter Clutch Charts (Trucks)
- Chart C-8, Torque Converter Clutch - 2.5L & 2.8L LT. Trucks & Vans
- Chart C-8 Torque Converter Clutch - 3.1L Vans
- Chart C-8 Torque Converter Clutch - 4.3L Turbo PFI
- Chart C-8, Torque Converter Clutch - 4.3L, 5.0L, 5.7L LT. Trucks & Vans
- Torque Converter Clutch Electrical Diagnosis - Diesel Electronic Control System
- Component Check Charts (Trucks)
- Output Speed Sensor Circuit Check - 2WD Except "C" & "K" Series
- Output Speed Sensor Circuit Check - 2WD - "C" & "K" Series
- Output Speed Sensor Circuit Check - 4WD Vehicles
- Input Speed Sensor Circuit Check - LT. Truck
- Brake Signal Circuit Check - All Engines, 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)
- Wiring Diagrams
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.