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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1373 (Automatic Transmission - ALLISON - DTC P0218 To DTC P0878) >> DTC P0701 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: You must perform the Circuit/System Verification first.
  1. Inspect the transmission fluid level. Refer to Transmission Fluid Check .
  2. Perform a line pressure test. Refer to Line Pressure Check .
  3. Remove and Replace the control main filter, refer to Automatic Transmission Fluid and Filter Replacement .
  4. Engine running, command the transmission through the forward ranges with a scan tool. Compare the TFP Switch 1, TFP Switch 2, TFP Switch 3, and TFP Switch 4 parameters in each forward range with the Pressure Switch Manifold Logic table. Refer to Pressure Switch Manifold (PSM) Logic .
  5. Ignition OFF, remove the X175 harness connector at the transmission.
    1. Ignition ON, engine OFF, connect a 3A fused jumper wire to the PS1 signal circuit terminal D to ground
    2. PS2 signal circuit terminal F to ground
    3. PS3 signal circuit terminal E to ground
    4. PS4 signal circuit terminal K to ground
    5. Verify with a scan tool the TFP Switch 1, TFP Switch 2, TFP Switch 3, and TFP Switch 4 parameters changed from High to Low when the signal circuit is grounded
    • If not the specified value, test affected pressure switch signal for an open/high resistance and short to ground. If circuits test normal, replace the TCM.
  6. Ignition OFF, connect the X175 harness connector to the transmission.
  7. Remove the transmission oil pan. Refer to Oil Pan Replacement .
  8. Remove the pressure switch module from the valve body. Leave the internal wire harness connected to the pressure switch manifold. Refer to Pressure Switch Manifold Replacement .
  9. Connect a jumper wire to the base of the pressure switch module and ground.
  10. Ignition ON, engine OFF, gently push on PS1, PS2, PS3, and PS4 switches. Verify with a scan tool that the TFP Switch 1, TFP Switch 2, and TFP Switch 3 parameters changed from High to Low and TFP Switch 4 parameter changed from Low to High.
    • If not the specified value, test the internal wire harness circuits for an open/high resistance or short to ground. If the circuits test normal, replace the pressure switch module.
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