## Idle Control System

#### Electrical Power Steering (EPS) Signal Circuit Troubleshooting

11-422

1. Turn the ignition switch ON (II).

2. Measure voltage between ECM/PCM connector terminals A24 and E16.

ECM/PCM CONNECTORS

Wire side of female terminals

Is there battery voltage?

YES | - Go to step 6.
NO | - Go to step 3.

3. Start the engine.
4. Turn the steering wheel to the full lock position.
5. Measure voltage between ECM/PCM connector terminals A24 and E16.

Is there battery voltage momentarily?

YES | - The EPS signal is OK.
NO | - Go to step 10.

6. Turn the ignition switch OFF.
7. Disconnect the EPS control unit 20P connector.
8. Turn the ignition switch ON (II).

9. Measure voltage between the EPS control unit terminal No.17 and body ground.

EPS CONTROL UNIT 20P CONNECTOR

Wire side of female terminals

Is there battery voltage?

YES | - Substitute a known-good EPS control unit and recheck.
NO | - Repair open in the wire between the ECM/PCM (E16) and the EPS control unit.

10. Turn the ignition switch OFF.
11. Disconnect the EPS control unit 20P connector.
12. Turn the ignition switch ON (II).