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Home >> Hummer >> 2008 >> H3 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (Anti-Lock Brake System, Traction Control System & Stability Control System) >> Diagnostic Information and Procedures >> DTC C0240 or P0856 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Isuzu i-370, 2008 Isuzu i-290, 2008 GMC Canyon, and 2008 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: It is recommend that the defective components be replaced, and not the complete brake master cylinder assembly.
  1. Use a scan tool in order to clear the DTCs. Cycle the ignition to OFF and then start the engine. A current failure will set a DTC.
  2. Ignition OFF, disconnect the harness connector at the EBCM.
  3. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal 23 and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance.
    • If greater than the specified range, test the signal circuit for a short to voltage.
  4. If the circuits test normal, replace the ECM. If DTC resets, replace the EBCM.
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