Group 28 Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) ECM SPN 636, Camshaft Position Sensor (CMP) – MID 128 SID 21 35 Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 2 • Data erratic, intermittent or incorrect • Phase Error - Incorrect correlation between CMP and crankshaft position (CKP) sensor • MIL illuminated • Increase in fuel consumption • Engine timing FMI 3 • Voltage above normal, or shorted to high source • Missing Signal from CMP sensor • Open in the CMP sensor circuit • Short to battery in the CMP sensor circuit • Short to ground in the CMP sensor circuit • MIL illuminated • Possible loss of engine power • Increased engine start time • Faulty harness FMI 8 • Abnormal frequency or pulse width or period • Noisy Signal from CMP sensor • Open in the CMP sensor circuit • MIL illuminated • Possible loss of engine power • Increased engine start time • Faulty CMP sensor • Faulty harness