STEP 1. Resistance measurement at ETACS-ECU connector (GND, SGND terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the ETACS-ECU connector (GND terminal) and ground.OK: The resistance should be 2 ohms or less
(3) Measure the resistance between the ETACS-ECU connector (SGND terminal) and ground.OK: The resistance should be 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, SGND line between ETACS-ECU connector and ground.
STEP 3. Voltage measurement at ETACS-ECU connector (+B1 terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Check the voltage between the ETACS-ECU connector (+B1 terminal) and 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 +B1 line between fusible link and ETACS-ECU connector.
STEP 5. Voltage measurement at ETACS-ECU connector (+B2 terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Check the voltage between the ETACS-ECU connector (+B2 terminal) and ground.OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 7. Go to Step 6.
STEP 6. Check of short to power supply, short to ground, and open circuit in +B2 line between fusible link and ETACS-ECU connector.
STEP 7. Retest the system.