P0652-SENSOR REFERENCE VOLTAGE 2 TOO LOW
For a complete wiring diagram Refer to Section 8W
Possible Causes
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INTERMITTENT DTC
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ACCELERATOR PEDAL POSITION SENSOR
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EXHAUST DIFFERENTIAL PRESSURE SENSOR
|
INLET AIR PRESSURE SENSOR
|
OIL PRESSURE SENSOR
|
MASS AIR FLOW SENSOR
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5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
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ENGINE CONTROL MODULE (ECM)
|
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
Theory of Operation
The ECM contains 3 internal 5–Volt Sensor Supply sources and one 8–Volt source. Each 5–Volt Supply source is split into parallel circuits to provide 5 volts to multiple sensors.
Sensor Supply 2 provides 5 volts to the Inlet Pressure Sensor, Exhaust Differential Pressure Sensor, Engine Oil Pressure Sensor, and the Accelerator Pedal Position Sensor 2 and 8 volts to the Mass Air Flow
Sensor.
Diagnostic Test
1.
CHECK FOR ACTIVE DTC
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Turn the ignition off for 10 seconds.
Turn the ignition on.
With the scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
No
2.
ACCELERATOR PEDAL POSITION SENSOR
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (F856) Accelerator Pedal Position Sensor No. 2 5 Volt Supply circuit at the APP Sensor harness connector.
Is the voltage above 4.6 volts?
Yes
No
3.
EXHAUST DIFFERENTIAL PRESSURE SENSOR
Turn the ignition off.
Disconnect the Exhaust Differential Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (K354) Exhaust Differential Pressure Sensor 5 Volt Supply circuit.
Is the voltage above 4.6 volts?
Yes
No
4.
INLET AIR PRESSURE SENSOR
Turn the ignition off.
Disconnect the Inlet Air Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (K668) Inlet Air Pressure Sensor 5 Volt Supply circuit.
Is the voltage above 4.6 volts?
Yes
No
5.
ENGINE OIL PRESSURE SENSOR
Turn the ignition off.
Disconnect the Engine Oil Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (K357) Engine Oil Pressure Sensor 5 Volt Supply circuit.
Is the voltage above 4.6 volts?
Yes
No
6.
MASS AIR FLOW SENSOR
Turn the ignition off.
Disconnect the MAF Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (F888) MAF Sensor 5 Volt Supply circuit.
Is the voltage above 4.6 volts?
Yes
No
7.
5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the (F856) Accelerator Pedal Position Sensor No. 2 5 Volt Supply circuit.
Measure the resistance between ground and the (K354) Exhaust Differential Pressure Sensor 5 Volt Supply circuit.
Measure the resistance between ground and the (K668) Inlet Air Pressure Sensor 5 Volt Supply circuit.
Measure the resistance between ground and the (K357) Engine Oil Pressure Sensor 5 Volt Supply circuit.
Measure the resistance between ground and the (F888) MAF Sensor 8 Volt Supply circuit.
Is the resistance above 1000 ohms for each circuit?
Yes
No
8.
ENGINE CONTROL MODULE (ECM)
Turn the ignition off.
Inspect the (F856) Accelerator Pedal Position Sensor No. 2 5 Volt Supply circuit between the Accelerator Pedal Position Sensor and the ECM.
Inspect the (K354) Exhaust Gas Pressure Sensor 5 Volt Supply circuit between the Exhaust Differential Pressure Sensor and the ECM.
Inspect the (K668) Inlet Air Pressure Sensor 5 Volt Supply circuit between the Inlet Air Pressure Sensor and the ECM.
Inspect the (K357) Oil Pressure Sensor 5 Volt Supply circuit between the Engine Oil Pressure Sensor and the ECM.
Inspect the (F888) MAF Sensor 8 Volt Supply circuit between the MAF Sensor and the ECM.
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Refer to any Technical Service Bulletins that may apply.
Were any problems found?
Yes
No