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, SGND terminal) and body 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 body ground.
STEP 3. Voltage measurement at ETACS-ECU connector (+B1, +B2 terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the voltage between the ETACS-ECU connector (+B1, +B2 terminal) 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 +B1, +B2 line between fusible link and ETACS-ECU connector.
STEP 5. Retest the system.