Clutch Switch Signal Circuit Troubleshooting
Clutch Switch Signal Circuit Troubleshooting1. Turn the ignition switch ON (II).
2. Measure voltage between ECM connector terminals B14 and B20.
Is there approx. 5 V?
YES - Go to step 3.
NO - Go to step 5.
3. Press the clutch pedal.
4. Measure voltage between ECM connector terminals B14 and B20.
Is voltage less than 1.0 V?
YES - Clutch switch signal is OK.
NO - Go to step 12.
5. Turn the ignition switch OFF.
6. Disconnect the clutch switch 2P connector.
7. Turn the ignition switch ON (II).
8. Measure voltage between ECM connector terminals B14 and B20.
Is there approx. 5 V?
YES - Replace the clutch switch.
NO - Go to step 9.
9. Turn the ignition switch OFF.
10. Disconnect ECM connector B (25P).
11. Check for continuity between ECM connector terminal B14 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECM (B14) and the clutch switch.
NO - Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.
Diagnostic Strategies
12. Turn the ignition switch OFF.
13. Disconnect the clutch switch 2P connector.
14. Check for continuity between the clutch switch 2P connector terminals No.1 and No.2 with the clutch pedal pressed.
Is there continuity?
YES - Go to step 15.
NO - Adjust the clutch switch.
15. Turn the ignition switch ON (II).
16. Measure voltage between the clutch switch 2P connector terminal No.2 and body ground with the clutch pedal pressed.
Is there approx. 5 V?
YES - Repair short in the wire between the clutch switch and G402.
NO - Repair open in the wire between the ECM (B14) and the clutch switch.