• | 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 |
---|---|---|---|---|---|
Battery Supply Voltage - Coil | -- | P023A | P023A | -- | -- |
Battery Supply Voltage - Armature/Switched Side | -- | P023A | P023A | -- | -- |
CAC Pump Relay Control Circuit | P023A | P023A | P023A | P023A | -- |
CAC Pump Voltage Supply | P023A | -- | -- | -- | -- |
The supercharger intercooler relay is a normally open relay. The relay armature is held in the open position by spring tension. The ignition 1 voltage is supplied directly to the relay coil and to the armature contact when the ignition is ON, or the engine is running. The engine control module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an output driver module (ODM). When the engine is running , the ECM commands the relay ON, and the relay coil creates an electromagnetic field. This electromagnetic field overcomes the spring tension and pulls the armature contact into the stationary contact of the relay load circuit. The closing of the relay contacts allow current to flow from the battery to the supercharger intercooler pump. When the ignition switch is turned to the OFF position, power is interrupted to the output driver module in the ECM and the relay electromagnetic field collapses. This allows the spring tension to separate the relay armature contact from the relay load circuit contact, which interrupts current flow to the supercharger intercooler pump.
If the ECM detects an improper voltage on the supercharger intercooler pump relay control circuit this DTC sets.
• | The intake air temperature (IAT) sensor 2 is greater than 0°C (32°F). |
• | The battery voltage is between 9-18 volts. |
• | The engine run time is greater than 10 seconds. |
• | The charge air cooler (CAC) pump relay has been commanded ON. |
• | The IAT is greater than -25°C (-13°F). |
• | This DTC runs continuously when the above conditions are met. |
The ECM detects an improper voltage on the supercharger (SC) intercooler pump relay circuit for greater than 30 seconds.
DTC P023A is a Type B DTC.
DTC P023A is a Type B DTC.
• | A slight resistance of 1-4 ohms on the CAC pump ground circuit or the CAC pump or pump relay B+ circuits may cause this DTC to set. |
• | This test procedure assumes that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test . |
• | When disconnecting electrical connectors or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the mating electrical terminals for correct tension. |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
J 43244 Relay Puller Pliers
⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. |
⇒ | If the test lamp does not illuminate, test the B+ coil supply circuit for a short to ground or an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the B+ switch supply circuit for an open/high resistance. If the circuit tests normal and the B+ switch supply circuit fuse is open, test the CAC pump voltage supply circuit for a short to ground. |
⇒ | If greater than the specified range, repair the ground circuit for an open/high resistance. |
⇒ | If the CAC coolant pump does not activate, test the CAC coolant voltage supply circuit for an open/high resistance. If the circuit tests normal, test the CAC coolant pump motor. Refer to Component Testing. |
⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM. |
⇒ | If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If the resistance is not within the specified range, replace the relay. |
• | 30 and 86 |
• | 30 and 87 |
• | 30 and 85 |
• | 85 and 87 |
⇒ | If not the specified value, replace the relay. |
⇒ | If greater than the specified range, replace the relay. |
⇒ | If the CAC pump does not activate, replace the CAC pump |
Perform the Diagnostic Repair Verification after completing the repair.
• | Control Module References for ECM replacement, setup, and programming |