Scheme 74
Scheme 75
Self-Diagnostic Function
The gauge assembly has a self-diagnostic function that checks these circuits
- The beeper drive circuit.
- The indicator drive circuit.
- The LCD segments.
- The gauges drive circuit (Speedometer, Tachometer, Fuel gauge, Coolant temperature gauge).
- The communication line (the coolant temperature signal and vehicle speed signal line between the gauge and the ECM/PCM).