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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1993 (Automatic Transmission - 4T45-E - DTC P0218 To DTC P0961) >> DTC P0842 or P0843 (Non-Hybrid) >> Circuit/System Testing (Non-Hybrid)

Circuit/System Testing (Non-Hybrid)

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. Drive the vehicle in D4 until the transmission shifts into 4th gear and the TCC is commanded ON. Observe the TCC Release Pressure parameter on the scan tool. The TCC Release Pressure should display No.
    • If the TCC Release Pressure displays Yes, turn OFF the engine and disconnect the AT 20-way inline connector. Using a terminal test kit, jumper the TCC release switch circuit at the engine harness side to ground. Turn ON the ignition with the engine OFF.
    • If the TCC Release switch parameter displays Yes, test the TCC release switch circuit for an open between the TCM and the AT 20-way inline connector.
    • If the parameter displays NO, test the TCC release switch signal circuit for an open between the AT 20-way inline connector and the TFP manual valve position switch.
  2. Reconnect the AT 20-way inline connector. Start the engine and observe the TCC Release Pressure parameter on the scan tool. The TCC Release Pressure should indicate Yes.
    • If the TCC Release Pressure displays No, disconnect the AT 20-way inline connector.
  3. With the AT 20-way inline connector disconnected, observe the TCC Release Pressure parameter on the scan tool. The parameter should display Yes.
    • If the parameter displays Yes, test the TCC release switch signal circuit for a short to ground between the AT 20-way inline connector and the TFP manual valve position switch.
    • If the parameter displays No, test the TCC release switch signal circuit for a short to ground between the TCM and the AT 20-way inline connector.
  4. Inspect for the following conditions that would cause TCC release pressure to be present when the TCC is applied:
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