C161A
Code No. C161A AYC direction valve (RH) output error
CAUTION
If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
OPERATION
^ The power from AWC-ECU is supplied to and energizes the hydraulic unit AYC direction valve (RH) solenoid.
FUNCTION
^ The AWC-ECU controls the activation command of the coil for the hydraulic unit AYC direction valve (RH) solenoid.
^ The hydraulic unit AYC direction valve (RH) solenoid controls the hydraulic pressure to the AYC differential right clutch.
TROUBLE JUDGMENT
Range of check
^ The DTC related to the power supply circuit is not set.
JUDGMENT CRITERIA
^ The activation command of the AYC direction valve (RH) solenoid is different from that shown on the monitor.
Fail-safe, backup function
^ The AWC-ECU suspends the AYC control and illuminates the multi-information display. Then DTC No. C161A is set.
PROBABLE CAUSES
^ Malfunction inside the AYC direction valve (RH) solenoid
^ Damaged harness wires and connectors
^ Open circuit, short to ground, and connector continuity failure between AWC-ECU and AYC direction valve (RH) solenoid
^ Open circuit and connector continuity failure between the AYC direction valve (RH) solenoid and the body ground
^ Malfunction inside the AWC-ECU
DIAGNOSTIC PROCEDURE
STEP 1. Scan tool CAN bus diagnostics
Using the scan tool, diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 3.
NO: Repair the CAN bus line. After repairing the CAN bus line, go to Step 2.
STEP 2. DTC recheck after repairing the CAN bus line
1) Erase the DTC.
2) Turn the ignition switch from the LOCK (OFF) position to the ON position, and then wait for 4 seconds.
3) Using the scan tool, apply the specified current to the AYC proportioning valve, and forcibly activate the AYC direction valve (RH). Special Function Reference Table
4) Check if the DTC is set.
Q: Is DTC No. C161A set?
YES: Go to Step 3.
NO: This diagnosis is complete.
STEP 3. Connector check:
Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case.
^ C-46 AWC-ECU connector
^ F-12 AYC direction valve (RH) connector
^ D-11 intermediate connector, F-11 intermediate connector
^ No. 9 body ground
Q: Are the connectors and terminals in good condition?
YES: Go to Step 4.
NO: Repair the faulty connector(s) or terminal(s). Then go to Step 8.
STEP 4. Harness check
1) Check the wiring harness among C-46 AWC-ECU connector (terminal No. 3), D-11 intermediate connector (terminal No. 10), F-11 intermediate connector (terminal No. 2), and F-12 AYC direction valve (RH) connector (terminal No. 2) for any problems.
2) Check the wiring harness among F-12 AYC direction valve (RH) connector (terminal No. 1), F-11 intermediate connector (terminal No. 3), and No. 9 body ground for any problems.
Q: Is the harness in good condition?
YES: Go to Step 5.
NO: Repair the problem in the wiring harness. Then go to Step 8.
STEP 5. Resistance measurement between AYC direction valve solenoid (RH) connector (equipment side) terminals
Disconnect the F-12 AYC direction valve (RH) connector and measure the resistance between connector terminals on the equipment side.
Standard value: 15.9 ± 0.5 ohms
Q: Is the measured resistance value within the standard value range?
YES: Go to Step 6.
NO: Replace the hydraulic unit. Then go to Step 8.
STEP 6. Scan tool service data
Check the following service data.
^ Item 95: AYC direction valve (RH) activation command
Q: Is the check result normal?
YES: Go to Step 7.
NO: Replace the AWC-ECU. Then go to Step 8.
STEP 7. Check whether the DTC is reset.
1) Erase the DTC.
2) Turn the ignition switch from the LOCK (OFF) position to the ON position, and then wait for 4 seconds.
3) Using the scan tool, apply the specified current to the AYC proportioning valve, and forcibly activate the AYC direction valve (RH). Special Function Reference Table
4) Check if the DTC is set.
Q: Is DTC No. C161A set?
YES: Replace the AWC-ECU. Then go to Step 8.
NO: An intermittent malfunction is suspected.
STEP 8. Check whether the DTC is reset.
1) Erase the DTC.
2) Turn the ignition switch from the LOCK (OFF) position to the ON position, and then wait for 4 seconds.
3) Using the scan tool, apply the specified current to the AYC proportioning valve, and forcibly activate the AYC direction valve (RH). Special Function Reference Table
4) Check if the DTC is set.
Q: Is DTC No. C161A set?
YES: Diagnose again from Step 1.
NO: This diagnosis is complete.