Component Inspection

Engine

Engine Control - P0504 Brake Switch 'A' / 'B' Correlation - Component Inspection

Component Inspection

1. Ignition "OFF".
2. Disconnect ECM harness connector.
3. Ignition "ON".
4. Measure voltage between Brake Light Switch terminal of ECM harness connector and chassis ground.
5. Measure voltage between Brake Test Switch terminal of ECM harness connector and chassis ground.
6. Step on the brake pedal.
7. Measure voltage between Brake Light Switch terminal of ECM harness connector and chassis ground.
8. Measure voltage between Brake Test Switch terminal of ECM harness connector and chassis ground.
Specification









9. Is voltage within specification?