STEP 1. Using scan tool (M.U.T.-IIISE), check other system's DTC.
Check that the ETACS-ECU has not set a DTC.(1) caution | To prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position 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) Turn the ignition switch to the "ON" position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC set?
Carry out the DTC procedures. Refer to GROUP 54A, ETACS-ECU . Go to Step 2.
STEP 2. Measure the voltage at the A/C controller assembly (A/C-ECU) connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Ignition switch: "ON"
(3) Voltage between IG1 terminal and body groundOK: System voltage
Is the check result normal?
Go to Step 4. Go to Step 3.
STEP 3. Check of open circuit in IG1 line between ETACS-ECU connector and A/C controller assembly (A/C-ECU) connector.
STEP 4. Measure the voltage at the A/C controller assembly (A/C-ECU) connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Voltage between B/UP terminal and body groundOK: System voltage
Is the check result normal?
Go to Step 6. Go to Step 5.
STEP 5. Check of open circuit in B/UP line between ETACS-ECU connector and A/C controller assembly (A/C-ECU) connector.
STEP 6. Measure the resistance at the A/C controller assembly (A/C-ECU) connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Resistance between E terminal and body groundOK: Continuity exists (2 Ω or less)
Is the check result normal?
Replace the A/C controller assembly (A/C-ECU). Go to Step 7.
STEP 7. Check of open circuit in E line between A/C controller assembly (A/C-ECU) connector and body ground.