Group 36 Vehicle Control Unit, Fault Tracing MID 144 PSID 4 Engine Brake Stalk Lever MID 144 PSID 8 Neutral Position Error MID 144 PSID 16 Power Relay 1 MID 144 PSID 20 Power Take-off Signal 15 Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause: FMI 3 • Abnormally high voltage or short circuit to higher voltage • Voltage above 4.8V • Yellow Check lamp lit • Retarder deactivated • Faulty harness • Connector FMI 4 • Abnormally low voltage or short circuit to lower voltage • Voltage below 0.2V • Yellow Check lamp lit • Retarder deactivated • Faulty harness • Connector Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 4 • Abnormally low voltage or short circuit to lower voltage • Neutral input shorted high or switch stuck closed • N/A • Faulty harness • Neutral switch Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause: FMI 3 • Abnormally high voltage or short circuit to higher voltage • Power relay 1 output shorted to battery • N/A • Faulty harness • EMS power relay FMI 4 • Abnormally low voltage or short circuit to lower voltage • Power relay 1 output shorted to ground • N/A • Faulty harness • EMS power relay Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 3 • Abnormally high voltage or short circuit to higher voltage • Voltage too high • Yellow Check lamp lit • Circuit shorted high • Faulty Harness • Faulty Valve FMI 4 • Abnormally low voltage or short circuit to lower voltage • Voltage below 2.3V • Yellow Check lamp lit • Circuit shorted low • Faulty Harness • Faulty Valve