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 0.16 second.

Possible Causes

INTERMITTENT CONDITION

(K853) CRANKSHAFT POSITION SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

(K854) BOOST PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

(K854) ACCELERATOR PEDAL POSITION SENSOR NO. 2 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

(F855) MASS AIRFLOW 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 2 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 Crankshaft Position Sensor, the Boost Pressure Sensor, Accelerator Pedal Position Sensor No. 2, and the Mass Airflow Sensor.

Diagnostic Test

1.CHECK FOR ACTIVE DTC

Is the status Active for this DTC?

Yes

Go To2

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

2.(K853) CRANKSHAFT POSITION SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Is there any voltage present?

Yes

Repair the (K853) Crankshaft Position Sensor 5 Volt Supply circuit for a short to voltage.
Perform the ECM VERIFICATION TEST. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Go To3

3.(K854) BOOST PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Is there any voltage present?

Yes

Repair the (K854) Boost Pressure Sensor 5 Volt Supply circuit for a short to voltage at the Intake Air Temperature/Boost Pressure Sensor harness connector.
Perform the ECM VERIFICATION TEST. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Go To4

4.(K854) ACCELERATOR PEDAL POSITION SENSOR NO. 2 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Is there any voltage present?

Yes

Repair the (K854) Accelerator Pedal Position Sensor No. 2 5 Volt Supply circuit for a short to voltage at the Accelerator Pedal Position Sensor harness connector.
Perform the ECM VERIFICATION TEST. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Go To5

5.(F855) MASS AIRFLOW SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Is there any voltage present?

Yes

Repair the (F855) Mass Airflow Sensor 5 Volt Supply circuit for a short to voltage at the Mass Air Flow Sensor harness connector.
Perform the ECM VERIFICATION TEST. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Go To6

6.ENGINE CONTROL MODULE (ECM)

Were any problems found?

Yes

Repair as necessary.
Perform the ECM VERIFICATION TEST. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM VERIFICATION TEST. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)