P1687

Tests 1 - 4:

Tests 5 - 8:

Test 9:

SYMPTOM
P1687 - NO CLUSTER BUS MESSAGES

POSSIBLE CAUSES
- Instrument cluster
- Open CCD(+) circuit
- Open CCD(-) circuit
- Wiring harness intermittent problem
- PCM CCD bus circuit open
- PCM CCD bus shorted to B+
- PCM internal CCD bus open