Inspection Procedure 5: Check the power supply and earth circuit to the immobilizer-ECU. <3000, 3800>






















COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. Connector check: D-310 key reminder switch connector

Q. Is the check result normal?
Go to Step 2.
Repair the defective connector.

STEP 2. Voltage measurement at key reminder switch connector D-310 in order to check the battery circuit of power supply system to the key reminder switch.
(1)Disconnect the key reminder switch connector D-310 and measure the voltage at key reminder switch connector D-310 harness side.
(2)Turn the ignition switch to “ON” position.
(3)Measure the voltage between terminal 5 and earth.
OK: System voltage

Q. Is the check result normal?
Go to Step 5.
Go to Step 3.

STEP 3. Connector check: B-15X engine control relay connector

Q. Is the check result normal?
Go to Step 4.
Repair the defective connector.

STEP 4. Check the wiring harness between B-15X engine control relay connector terminal No.1 and D-310 key reminder switch connector terminal No.5.
note Prior to the wiring harness inspection, check joint connector D-111, intermediate connector D-229, and repair if necessary.

  • Check the power supply line for open circuit and short circuit.

Q. Is the check result normal?
Go to Step 5.
Repair the wiring harness.

STEP 5. Resistance measurement at key reminder switch connector D-310 to check the earth circuit to the key reminder switch connector.
(1)Disconnect the key reminder switch connector D-310 and measure the resistance at key reminder switch connector D-310 harness side.
(2)Measure the resistance between terminal 3 and earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
The procedure is complete.
Go to Step 6.

STEP 6. Check the wiring harness between D-310 key reminder switch connector terminal No.3 and earth.
note Prior to the wiring harness inspection, check intermediate connector D-229, earth connector D-14 and repair if necessary.

  • Check the earth line for open circuit.

Q. Is the check result normal?
The procedure is complete.
Repair the wiring harness.