P0651-SENSOR SUPPLY 2 VOLTAGE TOO LOW

For a complete wiring diagram Refer to Section 8W

• When Monitored:

  With the ignition on.

• Set Condition:

  The ECM detects a low voltage for 0.1 second on the Sensor Supply #2 circuit which supplies 5-volts to the MAF Sensor, Fuel Pressure Sensor and Boost Pressure Sensor.

Diagnostic Test

NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.

NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

• Go To2

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

• Replace the Mass Air Flow Sensor.
• Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

• Go To3

• Replace the Fuel Pressure Sensor.
• Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

• Go To4

• Replace the Boost Pressure Sensor.
• Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

• Go To5

• Go To6

• Repair the 5-Volt Supply circuit for a short to ground.
• Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

• Repair shorted circuit as necessary.
• Perform the ECM Verification Test Ver. 1 (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 Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).