Group 36 Vehicle Control Unit, Fault Tracing MID 144 PID 46 Primary Tank Pressure MID 144 PID 83 Road Speed Limit Status MID 144 PID 84 Vehicle Speed 7 Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 1 • Data valid, but below the normal working range • Voltage below 2.5V • Yellow Check lamp lit • ECS out of level icon lit • Air leakage • Pressure just too low • Faulty/damaged air spring FMI 3 • Abnormally high voltage or short circuit to higher voltage • Voltage above 4.5V • Yellow Check lamp lit • Signal shorted to high • Faulty harness • Faulty tank air pressure sensor FMI 4 • Abnormally low voltage or short circuit to lower voltage • Voltage below 0.5V • Yellow Check lamp lit • ECS out of level icon lit • Signal shorted low • Faulty harness • Faulty tank air pressure sensor Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 14 • Special instructions • Low air suspension road speed limit exceeded (Driver exceeded limit with Air Suspension lowered) • N/A • Driver Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause: FMI 2 • Intermittent or incorrect data • Speed signal from speedometer and ABS differs too much • Gauge drops/inoperable • VSS Harness • VSS Sensor FMI 14 • Special instructions • Intermittent faulty data • Speed signal from VSS was updated incorrectly • N/A • SAE J1587 data link • Wiring harness