• | 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 | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
B+ | 1 | 1 | -- | -- |
Coolant Pump Relay Coil Side Supply Voltage | 1 | 1 | 1 | -- |
Coolant Pump Relay Control | 1 | 1 | 1 | -- |
Coolant Pump Relay Coil Side Ground | -- | 1 | -- | -- |
1. Coolant Pump Malfunction |
The APM and PIM are fastened together and are referred to as the drive motor/generator control module assembly. The drive motor/generator control module assembly is cooled with pre-mixed DEX-COOL® circulating through a cooling system that is separate from the engine cooling system. The power electronics cooling system utilizes a heat exchanger at the front of the vehicle and two electric pumps to circulate the coolant. The engine control module (ECM) monitors a temperature sensor in the power electronics cooling system and operates the radiator fan and the power electronics coolant pump in response to power electronics cooling system temperature.
Be sure DTC's P0C11, P0C12, P0C13, P0C14, P0C15 or P0C16 are not set. If any of these codes are set diagnose these first.
Air Delivery Description and Operation
Control Module References for scan tool information
⇒ | If the test lamp illuminates, test the relay controlled output circuit for a short to voltage. |
⇒ | If the test lamp does not illuminate, test the relay coil B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the relay coil B+ circuit fuse is open, test the relay controlled output circuit for a short to ground. If the circuit tests normal, test or replace the coolant pump relay. |
⇒ | If the test lamp does not illuminate, test the relay switch B+ circuit for an open/high resistance. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If the coolant pump does not activate, test the relay controlled output circuit for an open/high resistance. If the circuit tests normal, test or replace the coolant pump. |
⇒ | If the test lamp is always ON, test the relay coil control circuit for a short to ground. If the circuit tests normal, replace the ECM. |
⇒ | If the test lamp is always OFF, test the relay coil control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |