Introduction

Self-Diagnosis
The self-diagnosis is useful to diagnose malfunctions in major sensors and actuators of the E.C.C.S. system. There are 5 modes in the self-diagnosis system.

1. Mode I - Mixture ratio feedback control monitor A
- During closed loop condition:
The green inspection lamp turns ON when lean condition is detected and goes OFF by rich condition.
With clamping, mixture conditions (lean or rich) just before clamping are maintained.
- During open loop condition:
The green inspection lamp keeps OFF.

2. Mode II - Mixture ratio feedback control monitor B
The green inspection lamp function is the same as Mode I.
- During closed loop condition:
The red inspection lamp turns ON and OFF simultaneously with the green inspection lamp when the mixture ratio is controlled within the specified value.
- During open loop condition:
The red inspection lamp stays OFF.

3. Mode III - Self-Diagnosis
This mode is the same as the former self-diagnosis in self- diagnosis mode.

4. Mode IV - Switches ON/OFF diagnosis
During this mode, the inspection lamps monitor the switch ON-OFF condition.
- Throttle valve switch
- Starter switch
- Vehicle speed sensor

5. Mode V - Real time diagnosis
The moment the malfunction is detected, the display will be presented immediately. That is, the condition at which the malfunction occurs can be found by observing the inspection lamps during driving test.

Note: For more information, refer to Diagnostic Modes.