Circuit/System Verification

P0A8E 

If the DTC is set, replace the K59 starter generator control module.

P0A8D

1. Ignition OFF, measure and record the battery voltage at the C1 12V battery terminals. The battery voltage should stabilize between 12.4 and 12.8 V within a few minutes of turning the ignition OFF.
   • If not within the specified range, refer to Battery Inspection/Test for Hybrid (HP6).
2. Ignition ON, observe the scan tool Ignition 1 Signal parameter in the 14V Power Module data list. The parameter should be within 4.5 volts of the Low Voltage Circuit Voltage measured at the C1 12V battery.
   • If the voltage is not within the specified range, check the ignition circuit to the K59 starter generator control module for high resistance.
3. Remove the B+ terminal at the K59 starter generator control module.
4. Connect a test lamp between C1 12-volt positive battery post and the K59 starter generator control module terminal at the module.
5. Ignition ON, observe the scan tool parameter Low-Voltage Circuit Voltage in the 14V Power Module data list. The parameter should be within 0.5 volt of the actual 12-volt battery voltage.
   • If the voltage is not within the specified range, replace the K59 starter generator control module.
6. Ignition OFF, remove the positive connection at the C1 12-volt battery.
7. Measure the resistance of the 14 V Power Module positive harness between the X10 connector at the K59 starter generator control module and the X50A Fuse block-Underhood connection.
   • If the resistance is greater than 1.0 Ω, repair the open/high resistance condition in the 12-volt circuit.
   • If the resistance is less than 1.0 Ω, Test the 175 amp fuse in the X50A fuse block-underhood. If the fuse tests good, replace the K59 starter generator control module.