Diagnostic Procedure (TCU)
- The TCU will store up to 7 fault codes. These codes are displayed by an LED light in the cover of TCU.
- To access trouble codes, turn ignition on. Signal codes 2 and 6 (stored in memory) are displayed. Depress accelerator fully and let return. Signal code 6 is cleared. Start engine. Signal code 2 is cleared. Any trouble codes stored in TCU will not be displayed. See Fig 1 .
- To clear codes after repair. Repeat step 2).
TCU TROUBLE CODE IDENTIFICATION
| Code | Problem | Test |
|---|---|---|
| 1 | Faulty Knock Sensor Signal | TCU CODE 1 |
| 2 | Interruption of Ignition Signal | TCU CODE 2 |
| 3 | Short or Open Coolant Sensor | TCU CODE 3 |
| 4 | Faulty Stepping Motor | TCU CODE 4 |
| 5 | Shorted TPS | TCU CODE 5 |
| 6 | No Signal From TPS | TCU CODE 6 |
| 7 | Improper Voltage Supply | TCU CODE 7 |