C1612

DTC C1612: AWC Pressure Sensor System (High Voltage)

AWC PRESSURE SENSOR SYSTEM CIRCUIT

Refer to C1611.

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.
- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION

AWC-ECU controls the electric pump by the information from AWC pressure sensor.

DTC SET CONDITIONS

The code is set when AWC pressure sensor output voltage is 4.6 V or more.

PROBABLE CAUSES

- AWC pressure sensor malfunction
- Damaged harness wires and connectors
- Malfunction of AWC-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics

Using scan tool MB991958, diagnose the CAN bus lines.

Q. Is the check result normal?

YES Go to Step 3.
NO Repair the CAN bus lines. CAN Bus Diagnostics Chart.) After repairing the CAN bus line, go to Step 2.
STEP 2. Check whether the DTC is reset.

Q. Is DTC No. C1612 set?

YES Go to Step 3.
NO This diagnosis is complete.
STEP 3. Scan tool diagnostic trouble code

Check if the AWC-related DTC No. C1625 is set.(Refer to Super All Wheel Control (S-AWC).)

Q. Is the DTC set?

YES Perform the relevant troubleshooting. Then go to Step 9.
NO Go to Step 4.
STEP 4. AWC-ECU connector, intermediate connector, AWC pressure sensor connector check: C-46, D-11, F-13

Q. Is the check result normal?

YES Go to Step 5.
NO Repair the defective connector. Then go to Step 9.
STEP 5. Check the wiring harness between C-46 AWC-ECU connector terminal No. 7 and F-13 AWC pressure sensor connector terminal No. 2.

Check the wiring harness for open or short circuit (short to power supply).

Q. Is the check result normal?

YES Go to Step 6.
NO Repair the wiring harness. Then go to Step 9.
STEP 6. Check the wiring harness between C-46 AWC-ECU connector terminal No. 8 and F-13 AWC pressure sensor connector terminal No. 3.

Check the wiring harness for open circuit.

Q. Is the check result normal?

YES Go to Step 7.
NO Check D-11 intermediate connector. When no problem is found, repair the wiring harness. Then go to Step 9.
STEP 7. Scan tool service data

Item No. 87: Pressure sensor output voltage

OK: 0.20 - 2.67 V


Q. Is the check result normal?

YES Go to Step 8.
NO Replace the hydraulic unit. Removal and Replacement.) Then go to Step 8.
STEP 8. Check whether the DTC is reset.

Q. Is DTC No. C1612 set?

YES Replace the AWC-ECU.(Refer to Active Center Differential (ACD).) Then go to Step 9.
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions.)
STEP 9. Check whether the DTC is reset.

Q. Is DTC No. C1612 set?

YES Return to Step 1.
NO This diagnosis is complete.