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Home >> Isuzu >> 2007 >> Ascender RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 323 (Cruise Control System) >> Diagnostic Information & Procedures >> DTC P0568 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Isuzu Ascender, 2008 GMC Envoy, and 2008 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disable the SIR system. Refer to SIR Disabling and Enabling .
  2. Disconnect the turn signal multifunction switch harness connector X4.
  3. Ignition ON, verify that the scan tool Cruise Set/Coast Switch parameter displays Off or Inactive.
    • If the scan tool parameter reads On, Active or Invalid, test the cruise control set/coast switch signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Connect a 3 amp fused jumper between terminals A and D of the turn signal multifunction switch harness connector X4. Verify that the scan tool Cruise Set/Coast Switch parameter displays On.
    • If the scan tool parameter reads Off test the cruise control set/coast switch signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If the circuit tests normal, test or replace the cruise control switch.
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