Feedback Circuit: Microswitches
Turn ignition off. Disconnect coupler from ECM located behind right side of dashboard. Using an ohmmeter, test each sensor signal, except for oxygen sensor, using appropriate sensor terminal. See Figure . Compare resistance value to ELECTRONIC CONTROL MODULE FEEDBACK SENSOR chart.
CAUTION:
NEVER connect an ohmmeter to oxygen sensor circuit directly.
ELECTRONIC CONTROL MODULE FEEDBACK SENSOR CHART
| Sensor | Terminal No. | Ohms | Condition |
|---|---|---|---|
| Thermal Switch | 4 | Zero | When Coolant Temp is Less Than 116°F (46.5°C) |
| " | " | Infinite | When Coolant Temp is Above 116°F (46.5°C) |
| Idle Microswitch | 15 | Zero | Engine Warm, Accelerator Not Depressed |
| " | " | Infinite | When Accelerator is Depressed |
| High Altitude Compensator | 14 | 0 | Altitude is Above 4000 Ft. (1220 m) |
| " | " | Infinite | Altitude is Below 4000 Ft. (1220 m) |
| Thermal Engine Room Switch | 11 | Zero | Engine Room Temp is Below 67°F (19.5°C) |
| " | " | Infinite | Engine Room Temp is Above 67°F (19.5°C) |
| Wide Open Throttle Switch | 5 | Zero | Accelerator Pedal Slightly Depressed or Not Depressed |
| " | " | Infinite | When Accelerator is Completely Depressed |
| Fifth Switch | 19 | Zero | When Shifted Into Fifth Gear |
| " | " | Infinite | When Shifted Into All Gears Except Fifth |