C1619
Code No. C1619 AYC current value abnormality
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 proportioning valve solenoid.
FUNCTION
- The AWC-ECU controls the specified current of the coil for the hydraulic unit AYC proportioning valve solenoid.
- The hydraulic unit AYC proportioning valve solenoid controls the hydraulic pressure to the AYC differential right/left clutch.
TROUBLE JUDGMENT
Range of check
- The output to the AYC proportioning valve solenoid is 0.05 A or more.
- The DTC related to the power supply circuit is not set.
JUDGMENT CRITERIA
- The current monitor value of the AYC proportioning valve solenoid is abnormal.
Fail-safe, backup function
- AWC-ECU suspends the AYC control and illuminates the multi-information display. Then DTC No. C1619 is set.
PROBABLE CAUSES
- Malfunction inside the AYC proportioning valve solenoid
- Damaged harness wires and connectors
- Open circuit, short to ground, and connector continuity failure between the AWC-ECU and the AYC proportioning valve solenoid
- Open circuit and connector continuity failure between the AYC proportioning valve 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 CAN Bus Diagnostics Chart). 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)Check if the DTC is set.
Q. Is DTC No. C1619 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-17 AYC proportioning valve 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. 2), D-11 intermediate connector (terminal No. 25), F-11 intermediate connector (terminal No. 4), and F-17 AYC proportioning valve connector (terminal No. 3) for any problems.
(2)Check the wiring harness among F-17 AYC proportioning valve connector (terminal No. 2), 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 proportioning valve solenoid connector (equipment side) terminals
Disconnect the F-17 AYC proportioning valve connector and measure the resistance between connector terminals on the equipment side.
Standard value: 3.7± 0.3ohms
Q. Is the measured resistance value within the standard value range?
YES Go to Step 6.
NO Replace the hydraulic unit (Refer to Removal and Replacement). Then go to Step 8.
STEP 6. Scan tool service data
Check the following service data (Refer to Data List Reference Table).
- Item 93: Specified current for AYC proportioning valve
Q. Is the check result normal?
YES Go to Step 7.
NO Replace the AWC-ECU (Refer to Active Center Differential (ACD)). 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)Check if the DTC is set.
Q. Is DTC No. C1619 set?
YES Replace the AWC-ECU (Refer to Active Center Differential (ACD)). Then go to Step 8.
NO An intermittent malfunction is suspected. How to Cope With Intermittent Malfunctions.)
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)Check if the DTC is set.
Q. Is DTC No. C1619 set?
YES Diagnose again from Step 1.
NO This diagnosis is complete.