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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 P1A22, P1A23, P1A29, P1A2A, P1A30, or P1A33 >> 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:
  1. If there are any other DTCs set as current, diagnose those first, including any clearing of codes.
  2. Verify that the DTC is set as current.
  3. Scan and record the hybrid battery voltage parameters for battery 1, battery 2, and battery 3.
  4. Measure the voltage of the battery that set the DTC and compare it to the parameter scanned value. Refer to High Current Battery Temperature Sensor Replacement .
    • If the voltages are within 0.5 volt, replace the battery pack.
  5. Disconnect harness connector X2 from the BECM. Refer to Hybrid Battery Service Disconnect/Connect .
  6. Test for 1.3-1.7k ohms between the following circuits:
    • X2 terminal 1 to Generator Battery 1-X1
    • X2 terminal 11 to Generator Battery 1-X2
    • X2 terminal 2 to Generator Battery 2- X2
    • X2 terminal 12 to Generator Battery 3- X2
    • If not within specified range, replace the harness assembly.
  7. If all circuits test normal, replace the BECM.
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