C1625

DTC C1625: AWC Pressure Sensor System (Abnormal Power Supply Voltage)

AWC PRESSURE SENSOR SYSTEM CIRCUIT





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 monitors the AWC pressure sensor power supply voltage.

DTC SET CONDITIONS
The code is set when the power supply voltage to the AWC pressure sensor is outside the specified value.

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. After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.

Q: Is DTC No. C1625 set?
YES: Go to Step 3.
NO: This diagnosis is complete.

STEP 3. Voltage measurement at F-13 AWC pressure sensor connector
1) Disconnect the connector, and measure the voltage between the terminal No. 1 and the body ground.
2) Turn the ignition switch to the "ON" position.
OK: Approx. 5 V

Q: Is the check result normal?
YES: Go to Step 6.
NO: Go to Step 4.

STEP 4. AWC-ECU connector, AWC pressure sensor connector check: C-46, F-13

Q: Is the check result normal?
YES: Go to Step 5.
NO: Repair the defective connector. Then go to Step 8.

STEP 5. Check the wiring harness between C-46 AWC-ECU connector terminal No. 6 and F-13 AWC pressure sensor connector terminal No. 1.
Check the power supply line for short or open circuit.

Q: Is the check result normal?
YES: Go to Step 6.
NO: Check D-11 intermediate connector. When no problem is found, repair the wiring harness. Then go to Step 8.

STEP 6. Scan tool service data
Item No. 86: Pressure sensor power supply voltage

Q: Is the check result normal?
YES: Go to Step 7.
NO: Replace the hydraulic unit. Then go to Step 7.

STEP 7. Check whether the DTC is reset.

Q: Is DTC No. C1625 set?
YES: Replace the AWC-ECU. Then go to Step 8.
NO: Intermittent malfunction.

STEP 8. Check whether the DTC is reset.

Q: Is DTC No. C1625 set?
YES: Return to Step 1.
NO: This diagnosis is complete.