Diagnostic Aids
Perform this test when instructed during QUICK TEST or another SYSTEM TEST. This test is used to diagnose the following:
- ISO communication harness circuit.
- GND and B+ harness circuit.
- Faulty PCM.
- Faulty Transmission Control Module (TCM).
PCM-TO-TCM COMM CIRCUIT IDENTIFICATION
| PCM Terminal No. | Circuit | Wire Color | TCM Connector & (Terminal No.) |
|---|---|---|---|
| 7 | COMM | Green/Black | C277a (15) |
| 22 | COMM | Gray/Red | C277a (14) |
| 24 | COMM | Green/White | C277a (5) |
| 25 | COMM | White | C277a (6) |
| 31 | COMM | Pink/Black | C277a (7) |
| 33 | COMM | Red/Green | C277b (17) |