P0652

P0652-LOW VOLTAGE AT THE #1 SENSOR SUPPLY CIRCUIT

P0652 - Low Voltage At The #1 Sensor Supply Circuit:

WHEN MONITORED
With the key on.

SET CONDITION
Voltage detected on the sensor supply is below a calibrated value.

POSSIBLE CAUSES
- ECM
- (F855) #1 5-Volt supply shorted to ground
- (F855) #1 5-Volt supply shorted
- Fuel rail pressure
- A/C Pressure sensor
- MAP sensor
- Camshaft position sensor
- Intermittent condition

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test

1. ECM





Turn the ignition off.
Disconnect the ECM 60 pin harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.
Measure the voltage between the Sensor (F855) #1 5-volt Supply and the Sensor (K916) #1 Return pin at the ECM.

Q: Is the voltage between 4.5 and 5.5 volts?

YES: Go To 2
NO: Replace and program the ECM in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1

2. (F855) #1 5-VOLT SUPPLY SHORTED TO GROUND





Disconnect the Pressure sensors harness connectors and the engine position sensor.
Measure the resistance between the (F855) #1 sensor supply circuits at the ECM harness connector and battery negative.

Q: Is the resistance greater than 100K Ohms?

YES: Go To 3
NO: Repair the harness. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1

3. FUEL RAIL PRESSURE
Reconnect the ECM harness connector.
While monitoring with the scan tool, disconnect the fuel rail pressure sensor.

Q: Is DTC P0652 set?

YES: Go To 4
NO: Replace the Fuel rail pressure sensor. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1

4. A/C PRESSURE SENSOR
While monitoring with the scan tool, disconnect the A/C pressure sensor.

Q: Is DTC P0652 set?

YES: Go To 5
NO: Replace the A/C pressure sensor. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1

5. MAP SENSOR
While monitoring with the scan tool, disconnect the map sensor.

Q: Is DTC P0652 set?

YES: Go To 6
NO: Replace the MAP sensor. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1

6. CAMSHAFT POSITION SENSOR
While monitoring with the scan tool, disconnect the Camshaft position sensor.

Q: Is DTC P0652 set?

YES: Go To 7
NO: Replace the Camshaft position sensor. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1

7. (F855) #1 5-VOLT SUPPLY SHORTED





Measure the resistance between the (F855) #1 sensor supply circuit of the ECM harness connector and all other circuits in both ECM harness connectors.

Q: Is the resistance greater than 100K Ohms?

YES: Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
NO: Repair the shorted circuit. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1