Diagnosis Item 11: Diagnose when the M.U.T.-III cannot receive the data sent by fuel additive-ECU

caution

When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water pipe. If you fail to do, a component connected to the CAN bus line may be broken.

FUNCTION

TROUBLE JUDGMENT CONDITIONS

TROUBLESHOOTING HINTS

Malfunction of the connector [joint connector (CAN3) or fuel additive-ECU connector improperly connected]
Malfunction of the wiring harness [open circuit between the fuel additive-ECU and the joint connector (CAN3), power supply circuit to the fuel additive-ECU]
Malfunction of the fuel additive-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-132 fuel additive-ECU connector and C-01 joint connector (CAN3)

caution

The strand end of the twist wire should be within 10 cm from the connector. For details refer to

Q. Is the check result normal?

	Go to Step 2.

	Repair the defective connector.

STEP 2. Check the wiring harness between C-132 fuel additive-ECU connector and C-01 joint connector (CAN3)

caution

Strictly observe the specified wiring harness repair procedure. For details refer to

(1)Disconnect fuel additive-ECU connector and joint connector (CAN3), and check the following wiring harness.

(2)Check that there is continuity between C-132 fuel additive-ECU connector terminal No.8 and C-01 joint connector (CAN3) terminal No.3
OK: Continuity exists (2 Ω or less)

(3)Check that there is continuity between C-132 fuel additive-ECU connector terminal No.7 and C-01 joint connector (CAN3) terminal No.1
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

	Check the power supply circuit of the fuel additive-ECU. Refer to GROUP 13E - Troubleshooting.

	Repair the wiring harness.