Code No. C1460: Drive mode selector circuit failure

caution

If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, always diagnose the CAN bus lines.

OPERATION

If switching the drive mode selector to 2WD or LOCK do not change the drive mode at all, 4WD-ECU detects the drive mode selector internal circuit failure, and switches from 4WD AUTO mode in order to prevent system damage.

DIAGNOSIS CODE SET CONDITIONS

If the following conditions are met, 4WD-ECU switches the control from 4WD mode to 4WD AUTO mode, flashes the 4WD/LOCK indicators alternately, and sets the diagnosis code No. C1460.

Drive mode selector internal short
IG1 voltage: 7 V or more

PROBABLE CAUSES

Current trouble

Drive mode selector internal short
Short to earth between 4WD-ECU and the drive mode selector
4WD-ECU malfunction

Past trouble

Intermittent wiring harness or connector failure

note For diagnosis procedures, refer to "How to treat past trouble". (Refer to GROUP 00, How to Treat Past Trouble .)
Intermittent malfunction of drive mode selector

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics

Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

	Go to Step 3.

	Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting .) On completion, go to Step 2.

STEP 2. Check whether the diagnosis code is reset after repairing the CAN bus line.

(1)Erase the diagnosis code.

(2)Turn the ignition switch from the LOCK (OFF) position to the ON position and hold there for 15 seconds.

(3)Check that the meter display is correct when the drive mode selector is switched to each position (2WD, 4WD, and LOCK).

(4)Check if the diagnosis code is set.

Q. Is the diagnosis code No. C1460 set?

	Go to Step 3.

	This diagnosis is complete.

STEP 3. M.U.T.-III data list

Check the following service data. (Refer to

Item 10: 2WD SW
Item 11: LOCK SW

Q. Is the check result normal?

	Replace 4WD-ECU. (Refer to .)

	Go to Step 4.

STEP 4. Check the following connector:

Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case.

C-130 4WD-ECU connector
C-25 Drive mode selector connector
C-36 intermediate connector

Q. Are the connectors and terminals in good condition?

	Go to Step 5.

	Repair the connector(s) or terminal(s). Then go to Step 10.

STEP 5. Wiring harness check

Check the wiring harness between the C-130 4WD-ECU connector and the C-25 drive mode selector connector for damage or other problem.

Q. Is the wiring harness in good condition?

	Go to Step 6.

	Repair damage or other problem in the wiring harness. Then go to Step 10.

STEP 6. Resistance measurement between the drive mode selector connector terminals

Disconnect the C-25 connector, and measure the resistance value between the connector terminals on the drive mode selector side. (Refer to

Standard value: Continuity exists (2 Ω or less).

Q. Is the measured resistance value within the standard value range?

	Go to Step 7.

	Replace the drive mode selector. (Refer to .) Then go to Step 10.

STEP 7. Voltage measurement at the 4WD-ECU connector

(1)Disconnect the C-130 4WD-ECU connector.

(2)Measure the voltage between the C-130 wiring harness side connector terminals No. 4 and No. 10.
OK: Battery voltage

Q. Is the check result normal?

	Go to Step 9.

	Go to Step 8.

STEP 8. Wiring harness check

Wiring harness between the C-130 4WD-ECU connector and the C-313 ETACS-ECU connector
Wiring harness between the C-130 4WD-ECU connector and the C-317 ETACS-ECU connector

Check the wiring harness above for damage or other problem.

Q. Is the wiring harness in good condition?

	Go to Step 9.

	Repair the wiring harness. Then go to Step 10.

STEP 9. Check whether the diagnosis code is reset.

(1)Erase the diagnosis code.

(2)Turn the ignition switch from the LOCK (OFF) position to the ON position and hold there for 15 seconds.

(3)Check that the meter display is correct when the drive mode selector is switched to each position (2WD, 4WD, and LOCK).

(4)Check if the diagnosis code is set.

Q. Is the diagnosis code No. C1460 set?

	Replace 4WD-ECU. (Refer to .) Then go to Step 10.

	The trouble can be an intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)

STEP 10. Check whether the diagnosis code is reset.

(1)Erase the diagnosis code.

(2)Turn the ignition switch from the LOCK (OFF) position to the ON position and hold there for 15 seconds.

(3)Check that the meter display is correct when the drive mode selector is switched to each position (2WD, 4WD, and LOCK).

(4)Check if the diagnosis code is set.

Q. Is the diagnosis code No. C1460 set?

	Diagnose again from Step 1.

	This diagnosis is complete.