P0651

DTC P0651: 5 Volt Reference 2 Circuit

Circuit Description
The Engine Control Module (ECM) provides 5 volts to the following sensors through the 5 Volt Reference 2 Circuit:
^ Manifold Absolute Pressure (MAP) sensor
^ Exhaust Gas Recirculation position sensor
^ Accelerator Pedal Position (APP) sensor
^ A/C Pressure (ACP) sensor
^ Rough Road sensor
^ Fuel Tank Pressure (FTP) sensor

A circuit condition on one sensor 5 volt reference circuit may affect the other sensor 5 volt reference circuits. The ECM monitors the voltage on the 5 volt reference circuit. If the ECM detects that the voltage is out of tolerance, a DTC sets.

Conditions for Setting the DTC
^ Ignition ON.
^ The 5 volt reference 2 voltage is greater than 5.5 V or less than 4.5 V for a certain period of time.

Action Taken When the DTC Sets
^ The Malfunction Indicator Lamp (MIL) will illuminate.
^ The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
^ A history DTC is stored.

Conditions for Clearing the MIL/DTC
^ A history DTC will clear after 40 consecutive warm up cycles without a fault.
^ The DTC(s) can be cleared by using the scan tool.
^ Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids
For an intermittent condition, refer to Intermittents. Intermittents

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Step 3 (Continued) - 10:

Troubleshooting