Automatic Transaxle Diagnosis - 4T65-E: Wiring Chevrolet Venture I

Wiring Diagrams

PCM connector colors and terminal identification may vary with vehicle model and engine size. When using diagnostic procedures, see appropriate wiring diagram to determine which PCM connector(s) to disconnect during test procedure. Locate component being tested and trace specified circuit to determine PCM connector and terminal related to that component.

TRANSAXLE WIRING HARNESS

1. Install Jumper Harness (J-39775) on transaxle 20-pin connector (transaxle harness side). Using a DVOM and Connector Test Adapter Kit (J-35616), measure resistance between transaxle 20-pin connector terminals "A" and "E" (1-2 shift solenoid). see scheme 3 If resistance is 24-31 ohms at 190°F (88°C), go to step 3. If resistance is not 24-31 ohms at 190°F (88°C), go to next step.
2. Disconnect transaxle wiring harness connector at 1-2 shift solenoid. see scheme 1 Measure resistance between 1-2 shift solenoid terminals. If resistance is not 24-31 ohms at 190°F (88°C), replace 1-2 shift solenoid. If resistance is 24-31 ohms at 190°F (88°C), go to step 16.
3. Measure resistance between transaxle 20-pin connector terminals "B" and "E" (2-3 shift solenoid). see scheme 3 If resistance is 24-31 ohms at 190°F (88°C), go to step 5. If resistance is not 24-31 ohms at 190°F (88°C), go to next step.
4. Disconnect transaxle wiring harness connector at 2-3 shift solenoid. see scheme 1 Measure resistance between 2-3 shift solenoid terminals. If resistance is not 24-31 ohms at 190°F (88°C), replace 2-3 shift solenoid. If resistance is 24-31 ohms at 190°F (88°C), go to step 16.
5. Measure resistance between transaxle 20-pin connector terminals "E" and "T" (TCC PWM solenoid). see scheme 3 If resistance is 13-15 ohms at 190°F (88°C), go to step 7. If resistance is not 13-15 ohms at 190°F (88°C), go to next step.
6. Disconnect transaxle wiring harness connector at TCC PWM solenoid. see scheme 1 Measure resistance between solenoid terminals. If resistance is not 13-15 ohms at 190°F (88°C), replace TCC PWM solenoid. If resistance is 13-15 ohms at 190°F (88°C), go to step 16.
7. Measure resistance between transaxle 20-pin connector terminals "C" and "D" (pressure control solenoid). see scheme 3 If resistance is 5-6 ohms at 190°F (88°C), go to step 9. If resistance is not 5-6 ohms at 190°F (88°C), go to next step.
8. Disconnect transaxle wiring harness connector at pressure control solenoid. see scheme 1 Measure resistance between solenoid terminals. If resistance is not 5-6 ohms at 190°F (88°C), replace pressure control solenoid. If resistance is 5-6 ohms at 190°F (88°C), go to step 16.
9. Measure resistance between transaxle 20-pin in-line connector terminals "S" and "V" (input speed sensor). see scheme 3 If resistance is 1132-1428 ohms at 190°F (88°C), go to step 11. If resistance is not 1132-1428 ohms at 190°F (88°C), go to next step.
10. Disconnect transaxle wiring harness connector at input speed sensor. see scheme 1 Measure resistance between sensor terminals. If resistance is not 1132-1428 ohms at 190°F (88°C), replace input speed sensor. If resistance is 1132-1428 ohms at 190°F (88°C), go to step 16.
11. Measure resistance between transaxle 20-pin in-line connector terminals "L" and "M" (TFT sensor). see scheme 3 If resistance is 225-285 ohms at 190°F (88°C), go to step 13. If resistance is not 225-285 ohms at 190°F (88°C), go to next step.
12. Disconnect transaxle wiring harness connector at TFT sensor. see scheme 1 Measure resistance between sensor terminals. If resistance is not 225-285 ohms at 190°F (88°C), replace TFT sensor. If resistance is 225-285 ohms at 190°F (88°C), go to step 16.
13. Using DVOM and Connector Test Adapter Kit (J-35616), measure resistance between transaxle case and transaxle 20-pin in-line connector terminals "A", "B", "C", "D", "E" and "T". see scheme 3 If resistance is more than 250 k/ohms at each terminal, go to next step. If resistance is 250 k/ohms or less at each terminal, replace transaxle wiring harness.
14. Using DVOM and connector test adapter kit, measure resistance between transaxle case and transaxle 20-pin in-line connector terminals "L" and "M". see scheme 3 If resistance is more than 10 megohms at each terminal, go to next step. If resistance is 10 megohms or less at each terminal, replace transaxle wiring harness.
15. Using DVOM and connector test adapter kit, measure resistance between transaxle case and transaxle 20-pin in-line connector terminals "S" and "V". see scheme 3 If resistance is more than 250 k/ohms at each terminal, problem is intermittent. If resistance is 250 k/ohms or less at each terminal, replace transaxle wiring harness.
16. Inspect for high resistance. Check transaxle wiring harness for poor electrical connections at transaxle 20-pin in-line connector and at each component connector. Check for bent, backed out, deformed or damaged terminals. Check for weak terminal tension. Repair as necessary. After repairs, go to step 1. If no problem was found, problem is intermittent.

Transaxle Electronic Control System Wiring Diagram (Bonneville & LeSabre). Scheme 73

Transaxle Electronic Control System Wiring Diagram (Century). Scheme 74

Transaxle Electronic Control System Wiring Diagram (Grand Prix). Scheme 75

Transaxle Electronic Control System Wiring Diagram (Impala & Monte Carlo). Scheme 76

Transaxle Electronic Control System Wiring Diagram (Intrigue). Scheme 77

Transaxle Electronic Control System Wiring Diagram (Lumina). Scheme 78

Transaxle Electronic Control System Wiring Diagram (Montana, Silhouette & Venture). Scheme 79

Transaxle Electronic Control System Wiring Diagram (Park Avenue). Scheme 80

Transaxle Electronic Control System Wiring Diagram (Regal). Scheme 81