P0641

DTC P0641

CIRCUIT DESCRIPTION
The engine control module (ECM) provides a 5-Volt reference to the following sensors:
- The manifold absolute pressure (MAP) sensor
- The accelerator pedal position (APP) sensor 1
- The fuel level sensor 2

The ECM monitors voltage on the 5-Volt reference circuit. If the ECM detects that the voltage on the 5-Volt reference circuit is outside a calibrated range, DTC P0641 will set.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0641 5-Volt Reference 1 Circuit

CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- DTC P0641 runs continuously once the above condition is met.

CONDITIONS FOR SETTING THE DTC
The ECM detects a voltage that is out of range on the 5-Volt reference circuit for more than 1 second.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

TEST DESCRIPTION

Step 1 - Step 10:

Step 11 - Step 12:

The number below refers to the step number on the diagnostic table.
5. This step will determine if the APP sensor 1 is at fault, or if another device or circuit condition is at fault.