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Service Info: Engine Control Module (ECM) 5V Reference Circuits. Customer statement / workshop findings: This TPI provides supplementary technical information to support diagnosis of ECM 5V reference circuit DTCs. It details the sensors associated with each reference circuit (A, B, and C) and outlines relevant guidance to assist in isolating faults when any of the following DTCs are stored in the Engine Electronics (diagnostic address: 0001)
• Sensor Reference Voltage “A” Circuit – Open / High / Low (P0641, P0643, P0642)
• Sensor Reference Voltage “B” Circuit – Open / High / Low (P0651, P0653, P0652)
• Sensor Reference Voltage “C” Circuit – Open / High / Low (P0697, P0699, P0698)