STEP 1. 12V Starter Battery check.
STEP 2. Scan tool (M.U.T.-IIISE) other system DTC.
(1) caution | To prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE). |
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE)
."
(2) Check if DTC is set in the ETACS-ECU.
Is the DTC set?
Troubleshoot the ETACS. Refer to GROUP 54A - ETACS . Go to Step 3.
STEP 3. Voltage measurement at the ASC-ECU connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the voltage between ASC-ECU connector (+BV 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 +BV line between fusible link and ASC-ECU connector.
STEP 5. Voltage measurement at the ASC-ECU connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the voltage between ASC-ECU connector (+BM terminal) and body 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 +BM line between fusible link and ASC-ECU connector.
STEP 7. Voltage measurement at the ASC-ECU connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn on the power supply mode of the electric motor switch.
(3) Measure the voltage between ASC-ECU connector (IG1 terminal) and body ground.OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 9. Go to Step 8.
STEP 8. Check of short to power supply, short to ground, and open circuit in IG1 line between ETACS-ECU and ASC-ECU connector.
STEP 9. Resistance measurement at ASC-ECU connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Resistance between the ASC-ECU connector (GND1 terminal) and the body ground, and between the ASC-ECU connector (GND2 terminal) and the body groundOK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 11. Go to Step 10.
STEP 10. Check of open circuit in GND1, GND2 line between ASC-ECU connector and body ground.
STEP 11. Retest the system.