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 Ω 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: System 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: System voltage
Is the check result normal?
Replace KOS-ECU and register the ID codes (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 (6) and KOS-ECU connector