C1611
The content of this article and images reflects the changes identified in TSB-09-22-007.DTC C1611: AWC Pressure Sensor System (Low Voltage)
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 0.2 V or less.
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. C1611 set?
YES: Go to Step 3.
NO: This diagnosis is complete.
STEP 3. 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 4.
NO: Repair the defective connector. Then go to Step 7.
STEP 4. 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 short circuit.
Q: Is the check result normal?
YES: Go to Step 5.
NO: Repair the wiring harness. Then go to Step 7.
STEP 5. Scan tool service data
Item No. 87: Pressure sensor output voltage
Standard Value: 0.20 - 2.76V
Q: Is the check result normal?
YES: Go to Step 6.
NO: Replace the hydraulic unit. Then go to Step 6.
STEP 6. Check whether the DTC is reset.
Q: Is DTC No. C1611 set?
YES: Replace the AWC-ECU. Then, go to Step 7.
NO: Intermittent malfunction. (Refer to How to Cope with Intermittent Malfunction).
STEP 7. Check whether the DTC is reset.
Q: Is DTC No. C1611 set?
YES: Return to Step 1.
NO: This diagnosis is complete.