P0653-SENSOR REFERENCE VOLTAGE 2 TOO HIGH

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on.
Set Condition:
The ECM detects a short to voltage on the Sensor Supply 2 circuit for 0.10 seconds.

Possible Causes

INTERMITTENT CONDITION

(F856) ACCELERATOR PEDAL POSITION SENSOR NO. 2 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

(K354) EXHAUST DIFFERENTIAL PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

(K668) INLET AIR PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

(K357) ENGINE OIL PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

(F888) MASS AIR FLOW SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

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. 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, Mass Air Flow Sensor, and the Accelerator Pedal Position Sensor 2.

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

Go To 2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2. (F856) ACCELERATOR PEDAL POSITION SENSOR NO. 2 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Turn the ignition off.
Disconnect the Accelerator Pedal Position Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the TIPM.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay 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 there any voltage present?

Yes

Repair the (F856) Accelerator Pedal Position Sensor No. 2 5 Volt Supply circuit for a short to voltage.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To3

3. (K354) EXHAUST DIFFERENTIAL PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Turn the ignition off.
Disconnect the Exhaust Differential Pressure Sensor harness connector.

NOTE: The jumper wire should still be in place.

Turn the ignition on.
Measure the voltage of the (K354) Exhaust Differential Pressure Sensor 5 Volt Supply circuit at the Exhaust Differential Pressure Sensor harness connector.

Is there any voltage present?

Yes

Repair the (K354) Exhaust Differential Pressure Sensor 5 Volt Supply circuit for a short to voltage.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To4

4. (K668) INLET AIR PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Turn the ignition off.
Disconnect the Inlet Air Pressure Sensor harness connector.

NOTE: The jumper wire should still be in place.

Turn the ignition on.
Measure the voltage of the (K668) Inlet Air Pressure Sensor 5 Volt Supply circuit at the Inlet Air Pressure harness connector.

Is there any voltage present?

Yes

Repair the Inlet Air Pressure Sensor 5 Volt Supply circuit for a short to voltage.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To5

5. (K357) ENGINE OIL PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Turn the ignition off.
Disconnect the Engine Oil Pressure Sensor harness connector.

NOTE: The jumper wire should still be in place.

Turn the ignition on.
Measure the voltage of the (K357) Engine Oil Pressure Sensor 5 Volt Supply circuit at the Oil Pressure Sensor harness connector.

Is there any voltage present?

Yes

Repair the Engine Oil Pressure Sensor 5 Volt Supply circuit for a short to voltage.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To6

6. (F888) MASS AIR FLOW SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Turn the ignition off.
Disconnect the MAF Sensor harness connector.

NOTE: The jumper wire should still be in place.

Turn the ignition on.
Measure the voltage of the (F888) MAF Sensor 5 Volt Supply circuit at the MAF Sensor harness connector.

Is there any voltage present?

Yes

Replace the MAF Sensor 5 Volt Supply circuit for a short to voltage.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To7

7. 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 Differential 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) Engine Oil Pressure Sensor 5 Volt Supply circuit between the Engine Oil Pressure Sensor and the ECM.
Inspect the (F888) MAF Sensor 5 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

Repair as necessary.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)