## Idle Control System

#### Electrical Power Steering (EPS) Signal Circuit Troubleshooting (cont'd)

11-123

#### Brake Pedal Position Switch Signal Circuit Troubleshooting

13. Measure voltage between EPS control unit terminal No. 17 and the 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 | - Go to step 14.

14. Turn the ignition switch OFF.
15. Disconnect the ECM/PCM connector E (31P).
16. Check for continuity between body ground and ECM/PCM connector terminal E16.

ECM/PCM CONNECTORS E (31P)

Wire side of female terminals

Is there continuity?

YES | - Repair short in the wire between the ECM/PCM (E16) and the EPS control unit.
NO | - Substitute a known-good ECM/PCM and recheck (see page 11-6). If prescribed voltage is now available, replace the original ECM.

1. Check the brake lights.

Are the brake lights on without pressing the brake pedal?

YES | - Inspect the brake pedal position switch (see page 19-10).
NO | - Go to step 2.

2. Press the brake pedal.

Do the brake lights come on?

YES | - Go to step 3.
NO | - Go to step 4.

3. Measure voltage between ECM/PCM connector terminals A24 and E22 with the brake pedal pressed.

ECM/PCM CONNECTORS

Wire side of female terminals

Is there battery voltage?

YES | - The brake pedal position switch signal is OK.
NO | - Repair open in the wire between the ECM/PCM (E22) and the brake pedal position switch.