P0A06
DTC P0A06 or P0A07
Circuit Description
The following DTC's are for the starter/generator control module (SGCM) coolant pump relay:
^ P0A06 is for the SGCM coolant pump relay control circuit low voltage condition.
^ P0A07 is for the SGCM coolant pump relay control circuit high voltage condition.
The SGCM controls the coolant pump operation by applying voltage to the coolant pump relay control circuit with an internal solid state device called a driver. When the SGCM is commanding the relay ON, the voltage of the control circuit should be low, near 0 volts. When the SGCM is commanding the relay OFF, the voltage potential of the control circuit should be high, near 12 volts.
The SGCM monitors the relay control circuit for the following conditions:
^ Short to ground
^ Short to voltage
^ An open circuit
If the SGCM detects an improper voltage level on the coolant pump control circuit, then DTC P0A06 or P0A07 will set and the driver will be disabled.
DTC Descriptors
This diagnostic procedure supports the following DTC's:
^ DTC P0A06 Battery Energy Control Module Read Only Memory (ROM)
^ DTC P0A07 Battery Energy Control Module 5-Volt Reference Circuit
Conditions for Running the DTC
^ The engine has been running for 30 seconds.
^ The SGCM has received voltage on the ignition 0 voltage circuit.
^ The SGCM has turned ON and no configuration DTC are present.
^ For DTC P0A06 the SGCM coolant pump is commanded OFF.
^ For DTC P0A07 the SGCM coolant pump is commanded ON.
Conditions for Setting the DTC
^ For DTC P0A06 the SGCM detects a low voltage condition on the SGCM coolant pump relay control circuit.
^ For DTC P0A07 the SGCM detects a high voltage condition on the SGCM coolant pump relay control circuit.
Action Taken When the DTC Sets
^ The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
^ The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the 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.
Diagnostic Aids
If condition is not present, refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. During the SGCM coolant pump relay operation, listen for an audible click. Command the ON and the OFF states. Repeat the commands as necessary.
3. Verifies that the SGCM is providing voltage to the SGCM coolant pump relay.
4. Tests for an open in the ground circuit to the SGCM coolant pump relay.
5. Tests for constant voltage to the SGCM coolant pump relay.
