P0652
DTC P0652
CIRCUIT DESCRIPTION
The engine control module (ECM) provides 5 volts to the following sensors:
- The boost sensor
- The accelerator pedal position (APP) 2 sensor
- The turbocharger vane position sensor
- The A/C refrigerant pressure sensor
- The barometric pressure (BARO) sensor
These 5-volt reference circuits are independent of each other outside the ECM, but are bussed together inside the ECM. Therefore, 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 a low voltage condition, DTC P0652 sets.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0652 5-Volt Reference 2 Circuit Low Voltage
CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- DTC P0652 runs continuously.
CONDITIONS FOR SETTING THE DTC
- The ECM detects the 5-volt reference circuit 2 voltage is less than 4.7 volts.
- The above condition is present for 2 seconds.
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
