Power & Ground Circuits
- If time control function for ignition key warning or seat belt warning operates, TCU power and ground circuits are okay. If time control function for these systems is inoperative, turn ignition off.
- Check continuity between ground and TCU connector terminal No. 15. See Fig 1 . If there is no continuity, repair ground circuit. If there is continuity, check voltage between TCU connector terminal No. 15 and terminal specified in TIME CONTROL UNIT POWER CIRCUIT TEST table. If voltage is not as specified, repair appropriate circuit.
TIME CONTROL UNIT POWER CIRCUIT TEST
| Terminal Number & Ignition Switch Position | Volts | |
|---|---|---|
| 2 | ||
| OFF | 0 | |
| ACC | Battery | |
| ON | Battery | |
| 5 | ||
| OFF | 0 | |
| ACC | 0 | |
| ON | Battery | |
| 9 | ||
| OFF | Battery | |
| ACC | Battery | |
| ON | Battery | |