TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the MAF Sensor harness connector.
Turn the ignition on.
Measure the voltage of the Sensor Reference Voltage A circuit.
Is the voltage above 4.8 volts?
All
Yes
→ Replace the Mass Air Flow Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the Accelerator Pedal Position Sensor harness connector.
Turn the ignition on.
Measure the voltage of the Sensor Reference Voltage A circuit.
Is the voltage above 4.8 volts?
All
Yes
→ Replace the Accelerator Pedal Position Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the MAF Sensor and Accelerator Pedal Position Sensor harness connec-
tors.
Measure the resistance between ground and the Sensor Reference Voltage A circuit.
Is the resistance above 100 kohms?
All
Yes
→ Go To 6
No
→ Repair the Sensor Reference Voltage A circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
6
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the MAF Sensor harness connector.
Measure the resistance between the Sensor Reference Voltage A circuit and the MAF
Sensor Ground circuit.
Disconnect the Accelerator Pedal Position Sensor harness connector.
Measure the resistance between the Sensor Reference Voltage A circuit and both
Accelerator Pedal Position Sensor Ground circuits.
Is the resistance above 100 kohms for each measurement?
All
Yes
→ Go To 7
No
→ Repair the Sensor Reference Voltage A circuit for a short to the
Sensor Ground circuit that measured below 100 kohms.
Perform ROAD TEST VERIFICATION - VER-2.
140
DRIVEABILITY - DIESEL
P0641-SENSOR REFERENCE VOLTAGE A CKT VOLTAGE TOO LOW —
Continued