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Home >> Pontiac >> 2008 >> Torrent GXP, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 149 (Automatic Transmission - 6T70 - DTC P0218 To DTC P1686) >> DTC P0850-P0852 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. 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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