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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1994 (Automatic Transmission - 6T75 - DTC P0218 To DTC P0977) >> DTC P0850-P0852 >> 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.
  1. Ignition OFF, disconnect the 20-way harness connector at the transmission.
  2. Install the DT-47825-20  to the 20-way harness connector to the engine harness. See Special Tools .
  3. Test for less than 10 ohms between the ground circuit terminal 18 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, test for B+ between the adapter harness terminal 20 and ground.
    • If not within the specified range, test the park/neutral signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. Ignition OFF, install the DT-47825-20  to the 20-way harness connector at the transmission. See Special Tools .
  6. Gear shift lever in Park, test for less than 1 ohm between the adapter harness pins 18 and 20.
    • If greater than the specified range, test the shaft position switch assembly. Refer to Component Testing. If the shaft position switch assembly tests normal, replace the control solenoid (w/body and TCM) valve assembly.
  7. Gear shift lever in D (drive), test for infinite resistance between the adapter harness pins 18 and 20.
    • If not the specified value, test the shaft position switch assembly, refer to Component Testing. If the switch assembly test normal, replace the control solenoid (w/body and TCM) valve assembly.
  8. If all circuits test normal, replace the ECM.
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