P1491

Test 1 - 4:

Test 5 - 7:

SYMPTOM
P1491-COOLING FAN RELAY CONTROL CIRCUIT

POSSIBLE CAUSES
- Good trip equal to zero
- (A16) fused B+ circuit
- (K173) cooling fan relay control circuit open
- (K173) cooling fan relay control circuit short to ground
- (Z307) ground circuit open
- Radiator fan relay
- PCM