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DTC C1612: AWC Pressure Sensor System (High Voltage)


AWC PRESSURE SENSOR SYSTEM CIRCUIT


Refer to .
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



DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting ). After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.

Q. Is DTC No. C1612 set?
Go to Step 3.
This diagnosis is complete.

STEP 3. Scan tool diagnostic trouble code
Check if the ACD-related DTC No.C1625 is set. (Refer to ).

Q. Is the DTC set?
Perform the relevant troubleshooting. Then go to Step 9.
Go to Step 4.

STEP 4. AWC-ECU connector, intermediate connector, AWC pressure sensor connector check: C-51, D-11, F-27

Q. Is the check result normal?
Go to Step 5.
Repair the defective connector. Then go to Step 9.

STEP 5. Check the wiring harness between C-51 AWC-ECU connector terminal No.7 and F-27 AWC pressure sensor connector terminal No.2.
Check the output line for short (for short to the power supply) or open circuit.

Q. Is the check result normal?
Go to Step 6.
Repair the wiring harness. Then go to Step 9.

STEP 6. Check the wiring harness between C-51 AWC-ECUconnector terminal No.8 and F-27 AWC pressure sensor connector terminal No.3.
Check the ground line for open circuit.

Q. Is the check result normal?
Go to Step 7.
Check D-11 intermediate connector. When no problem is found, repair the wiring harness. Then go to Step 9.

STEP 7. Scan tool data list
Item No.87: Pressure sensor output voltage.
OK: 0.20 - 2.67 V

Q. Is the check result normal?
Go to Step 8.
Replace the hydraulic unit. (Refer to ). Then go to Step 8.

STEP 8. Check whether the DTC is reset.

Q. Is DTC No. C1612 set?
Replace the AWC-ECU. (Refer to ). Then go to Step 9.
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 9. Check whether the DTC is reset.

Q. Is DTC No. C1612 set?
Return to Step 1.
This diagnosis is complete.