5 VOLT-REFERENCE "A" CIRCUIT
PCM uses 5-volt reference "A" circuit as a sensor feed for
EGR valve pintle position, fuel tank pressure (VIN K), MAP, and TP
sensors. PCM monitors voltage on this circuit. If PCM senses voltage
out of tolerance, DTC P1635 sets.
You likely won't notice any drivability problems.
- PCM detects an out of tolerance condition on the 5-volt
- Check for faulty connections or damaged harness, MAP, MAF, TPS, etc