Troubleshooting W/System Checker 83: Malfunction:
- Water thermo-sensor - Control unit outputs a constant 80°C (176°F) command.
- Oxygen Sensor - Control unit holds A/F solenoid to duty 20 %.
- Vacuum Sensor - Control unit prevents operation of EGR valve, and A/F solenoid to duty 0 %.
- EGR Position Sensor - Control unit prevents operation of EGR value.