STEP 1. Resistance measurement at KOS-ECU connector (GND line)
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the KOS-ECU connector (GND line) and body ground.OK: Continuity exists (2 ohms or less)
Is the check result normal?
Go to Step 3. Go to Step 2.
STEP 2. Check of open circuit in GND line between KOS-ECU connector and body ground
STEP 3. Voltage measurement at KOS-ECU connector (IG1 line)
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Check the voltage between the KOS-ECU connector (IG1 line) and body ground.OK: The voltage should measure approximately 12 volts (battery positive voltage)
Is the check result normal?
Go to Step 5. Go to Step 4.
STEP 4. Check of short to power supply, short to ground, and open circuit in IG1 line between ETACS-ECU connector and KOS-ECU connector
STEP 5. Voltage measurement at KOS-ECU connector (PWR line)
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Check the voltage between the KOS-ECU connector (PWR terminal) and body ground.OK: The voltage should measure approximately 12 volts (battery positive voltage)
Is the check result normal?
Replace the KOS-ECU and register the chassis number (Refer to ). Go to Step 6.
STEP 6. Check of short to power supply, short to ground, and open circuit in PWR line between fusible link (4) and KOS-ECU connector