FixVault
Home › GMC › 2002 › Jimmy 2D Utility, Part Time, Automatic › Repair and Diagnosis › External Pages › Different car › Section 1848 (Hybrid Energy Storage System) › Diagnostic Information and Procedures › DTC P0AF8, or P0AFB › Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: To help avoid personal injury, additional precautions must be taken prior to working on the generator control module or the generator starter. After removing the 36V battery cables from the generator battery, remove both engine wiring harness connectors from the generator control module. Wait at least 5 minutes and then remove the generator control module cover. Verify voltage levels at all 36V, 12V, and 3-phase connections, are less than 3 volts using a DMM before proceeding.
CAUTION: To help avoid personal injury, be careful when working in the vicinity of the generator battery disconnect control module. Internal components will still be live, 36V potential, even when the cover has been opened or removed.

P0AF8

  1. If DTC is history, refer to Testing for Intermittent Conditions and Poor Connections .
  2. Ignition ON, observe the scan tool Hybrid Battery System Voltage parameter in the BECM data list and the Hybrid System Voltage parameter in the SGCM data list. The voltage should not differ by more than 5 volts.
    • If greater than the specified range, replace the BECM.

P0AFB

  1. If DTC is history, refer to Testing for Intermittent Conditions and Poor Connections .
  2. Ignition ON, observe the scan tool Hybrid Battery System Voltage parameter in the BECM data list. The voltage should be less than 50 volts.
    • If greater than the specified range, replace the SGCM.
About FixVault