Electrical Load Switch

ELECTRICAL LOAD SWITCH







OPERATION
- The electrical load switch inputs ON/OFF state of the switch of equipment that consumes much power during idling, namely, equipment with a large electrical load, to the engine control module. Based on this signal, the engine control module controls the idle air control motor.
- When the switch of equipment with a large electrical load is turned ON, the battery voltage is applied to the engine control module to indicate that the equipment switch is turned ON.




INSPECTION
Using Scan Tool

HARNESS INSPECTION




Measure the input voltage of engine control module.
- Engine control module connector: Disconnected
- Lighting switch: ON (Tail light relay ON)
Voltage (V): Battery positive voltage
OK: GO TO STEP 2
NG: Check circuit related to tail light relay.




Measure the input voltage of engine control module.
- Engine control module connector: Disconnected
- Defogger switch: ON (Defogger relay ON)
Voltage (V): Battery positive voltage
OK: GO TO STEP 3
NG: Check circuit related to defogger relay.




Measure the input voltage of engine control module.
- Engine control module connector: Disconnected
- Brake pedal: Depressed (Stop light switch ON)
Voltage (V): Battery positive voltage
OK: STOP
NG: Check circuit related to stoplight relay