Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0652: 5-Volt Reference 2 Circuit Low VoltageDTC P0653: 5-Volt Reference 2 Circuit High Voltage
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
APP Sensor 2 - 5-Volt Reference | P0117, P0462, P0522, P0652, P011A, P2454 | P2138 | P2127 | P0118, P0653, P011A, P244B, P2455 | -- |
Oil Pressure Sensor - 5-Volt Reference | P0117, P0462, P0522, P0652, P011A, P2454 | P0522 | P0522 | P0118, P0522, P0653, P011A, P244B, P2455 | -- |
Fuel Rail Pressure Sensor - 5-Volt Reference | P0117, P0462, P0522, P0652, P011A, P2454 | P0087, P0192 | P0193 | P0118, P0653, P011A, P2455 | -- |
DPF Differential Pressure Sensor | P0117, P0462, P0652, P011A P2454 | P2453, P244B | P2454 | P0118, P0653, P011A P2455 | -- |
Circuit/System Description
The engine control module (ECM) supplies 5 volts to components through 5-volt reference circuits. These 5-volt reference circuits are independent of each other outside the ECM, but are bussed together in three reference groups inside the ECM. Therefore, a circuit condition on one sensor 5-volt reference circuit may affect multiple components. The ECM monitors voltage on the 5-volt reference circuits.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The diagnostics run continuously. |
Conditions for Setting the DTC
P0652
| • | The ECM detects the 5-volt reference 2 circuit voltage is less than 4.7 volts. |
| • | The above condition is present for 2 seconds. |
P0653
| • | The ECM detects the 5-volt reference 2 circuit voltage is more than 5.2 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. |
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
| • | The engine starts and runs. |
| • | Observe the 5-Volt Reference 2 Circuit Status parameter with a scan tool. The parameter should display OK. |
Circuit/System Testing
Important: Additional DTCs will set when disconnecting the components.
- Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC.
- Ignition ON, measure for 4.8-5.2 volts between one of the 5-volt reference circuits and ground.
- Connect each component associated with the 5-volt reference circuit, one at a time, while monitoring the voltage. The voltage should not change more than 1 volt.
Important: A short to voltage on the signal circuit of certain components may cause this DTC to set.
| ⇒ | If the voltage is less than the specified range, test for a short to ground on all the 5-volt reference circuits. If all circuits test normal, replace the ECM. |
| ⇒ | If the voltage is greater than the specified range, test for a short to voltage on all the 5-volt reference circuits. If all circuits test normal, replace the ECM. |
| ⇒ | If the voltage display increases greater than the specified value when a component is connected, test the signal circuit for a short to voltage. If all circuits test normal, replace the ECM. |
| ⇒ | If the voltage display decreases more than the specified value when a component is connected, replace the component. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
