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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1967 (Hybrid Energy Storage System - 2.4L (Hp7)) >> Diagnostic Information and Procedures >> DTC P0AF8 or P0AFB >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

P0AF8

  1. Verify the DTC is set as current.
  2. Ensure the hood is fully closed. Ignition ON, observe and record the scan tool Hybrid Battery System Voltage parameter in the SGCM data list.
  3. Ignition ON, observe and record the scan tool Hybrid Battery System Voltage parameter in the BECM data list, the SGCM and BECM voltage parameters should not differ by more than 5 volts.
    • If greater than the specified range, visually inspect the 36 volt cable from the hybrid battery pack to SGCM for damage or an open/high resistance.
    • If the 36 volt cable damaged replace the 36 volt cable. Refer to 36-Volt Battery Positive Cable Replacement .
  4. Ignition OFF, remove the generator battery disconnect control module cover. Refer to Hybrid Battery Service Disconnect/Connect . Inspect the 36 volt and ground cable connections of the hybrid battery pack.
  5. Depress and hold the service disconnect for 20 seconds and measure the voltage at the hybrid battery pack the 36 volt terminal to ground. The voltage should not differ by more than 3 volts from the voltage measured in step 3.
  6. Note some vehicles have a plastic cover over this area to be measured that must be removed. Measure the voltage at the hybrid battery pack the 36 volt terminal pack side of contactor to ground. The voltage should not differ by more than 3 volts from the scan tool parameter display in step 5.
    • If greater than specified value inspect the hybrid battery pack ground cable for being loose or an open/high resistance, the generator battery fuse for an open.
  7. If the ground circuit tests normal, the fuse was not open and voltage differs by more than 3 volts, replace the generator battery disconnect control module.
  8. Gain access to the 36 volt output cable and connections at the SGCM refer to 175 Amp Mega Fuse Replacement .
  9. Inspect the 36 volt output cable and 36 volt connections for being loose, damaged or arcing.
  10. If all connections and circuits test normal, replace the SGCM.
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