• | 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. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
CKP Sensor 5-Volt Reference | P0652, P0335, P2127 | P0335 | P0335 | P0335, P0653, P2128 | -- |
APP Sensor 2 - 5-Volt Reference | P0335, P0652, P2127 | P2138 | P2127 | P0653, P2128 | -- |
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.
• | DTC P0653 is not set. |
• | The ignition is ON for more than 2 seconds . |
• | The battery voltage is between 10-16 volts. |
• | DTC P0652 is not set. |
• | The ignition is ON for more than 2 seconds . |
• | The battery voltage is between 10-16 volts. |
The ECM detects the 5-volt reference 2 circuit voltage is less than 4.5 volts.
The ECM detects the 5-volt reference 2 circuit voltage is more than 5.5 volts.
DTC P0652 and P0653 are Type A DTCs.
DTC P0652 and P0653 are Type A DTCs.
Control Module References for scan tool information
• | The engine starts and runs. |
• | Observe the 5-Volt Reference 2 Circuit Status parameter with a scan tool. The parameter should display OK. |
⇒ | If the voltage measures 4.7-5.2 volts, replace the APP sensor. |
⇒ | If voltage changes when one of the above components is disconnected, replace the component. Refer to the appropriate replacement procedure. |
⇒ | If no problem was found in the 5-volt reference 2 circuit , replace the ECM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |