P0251

Test 1 - 3:

Test 4 - 6:

SYMPTOM
P0251-CP3 PUMP REGULATOR CONTROL

WHEN MONITORED
When the ignition is on.

SET CONDITION
The ECM detects a discrepancy between the PWM supplied to the Electronic Fuel Control Actuator and the PWM returned from the Electronic Fuel Control Actuator.

POSSIBLE CAUSES
- Intermittent condition
- Fuel control actuator
- (K31) return circuit open from FCA to ECM
- (K65) 5-volt supply circuit open from FCA to ECM
- (K65) 5-volt supply circuit shorted to voltage
- ECM