Circuit/System Testing
WARNING: This page is about a different car, the 2009 GMC Canyon and 2009 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.
- Ignition OFF, disconnect the harness connector at the EBCM.
- 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 the circuit tests normal, replace the ECM.
- If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- If the circuits test normal, replace the EBCM.