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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1673 (Hybrid Energy Storage System - 2.4L (Hp7)) >> Diagnostic Information and Procedures >> DTC P1A0E or P1A0F >> 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.
WARNING: 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.
WARNING: 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.
NOTE: In order to avoid damaging BECM X1 and X2 connector terminals, the proper test probes should be used. The proper test probes are as follows:

P1A0E

  1. Remove the generator battery disconnect control module cover. Refer to Hybrid Battery Service Disconnect/Connect .
  2. Measure and record the voltage at Main Contactor Relay X2 to ground.
  3. Depress and hold the service disconnect switch and measure the voltage at Main Contactor Relay X1 to ground. The voltage should read the same as in step 2.
    • If no voltage was measured at Main Contactor Relay X1 with service disconnect switch depressed, replace the BECM.
  4. Disconnect connectors X1 and X2 from the BECM.
  5. Test for less than 6.5 volts between X1 terminal 1 and X2 terminal 1, while depressing the service disconnect switch.
    • If greater than the specified range, replace the BECM.
  6. Remove the generator battery cover. Refer to High Current Battery Temperature Sensor Replacement .
  7. Measure the resistance between X2 terminal 1 and Main Contactor Relay X1. Should measure between 1.3-1.7 k ohms.
    • If not within specified range, replace the BECM.
  8. Measure the resistance between X1 terminal 1 and Generator Battery 1 X1. Should measure between 1.3-1.7 k ohms.
    • If not within specified range, replace the harness assembly.

P1A0F

  1. Remove the generator battery disconnect control module cover. Refer to Hybrid Battery Service Disconnect/Connect .
  2. Measure and record the voltage at Main Contactor Relay X2 ground. Should read pack voltage.
  3. Measure the voltage at Main Contactor Relay X1 to ground. Should read no voltage.
    • If greater than the specified range, replace the BECM.
  4. Disconnect connectors X1 and X2 from the BECM.
  5. Remove the generator battery cover. Refer to High Current Battery Temperature Sensor Replacement .
  6. Measure the resistance between X2 terminal 1 and Main Contactor Relay X1. Should measure between 1.3-1.7 k ohms.
    • If not within specified range, replace the BECM.
  7. Measure the resistance between X1 terminal 1 and Generator Battery 1- X1. Should measure between 1.3-1.7 k ohms.
    • If not within specified range, replace the harness assembly.
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