shrekalec86

Just rebuilt my trans and put it back in and this code comes up c161e so I checked and clear and when I drive easy not really getting on the car it dosent throw the code. But when I put thru the paces it will come back could the pump be bad or something loose??

jd888jd

iTrader: (4)

Yes your ACD pump is not working the way it should. My buddy had this problem, will cost him $3500 parts and labour to get it fixed. Unless its still under warranty. Unfortunately for him its not covered anymore.

cfdfireman1

iTrader: (11)

DTC C161E: Electric Pump Relay Circuit System (Stuck)
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.
Since the fluid in the hydraulic unit will be hardened under low temperature, the load of the pump increases and the motor may not operate normally. Therefore, completely remove snow and ice from the hydraulic unit and leave the vehicle under temperature of 0°C (32°F) or higher for 4 hours or more before performing the troubleshooting.

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

DTC SET CONDITIONS
The code is set when the electric pump operation signal is output from AWC-ECU, and when the AWC pressure sensor signal is not reached the specified pressure after the specified time has elapsed.



PROBABLE CAUSES

Fluid malfunction (low fluid level)
AWC pressure sensor malfunction
Electric pump relay malfunction
Hydraulic unit malfunction
Electric pump malfunction
Damaged harness wires and connectors
Malfunction of AWC-ECU
Used under low temperature condition

cfdfireman1

iTrader: (11)

DIAGNOSTIC PROCEDURE

STEP 1. Check whether the diagnostic trouble code is reset.
As for vehicles under low temperature condition, carry out the contents of the precautions, and then check the diagnostic trouble code again.
Q: Is diagnosis code No.C161E set?
YES: Go to Step 2.
NO: This diagnosis is complete.

STEP 2. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 4.
NO: Repair the CAN bus lines. After repairing the CAN bus line, go to Step 3.

STEP 3. Check whether the DTC is reset.
Q: Is DTC No. C161E set?
YES: Go to Step 4.
NO: This diagnosis is complete.

STEP 4. Fluid check
Check that the fluid level is adequate. (See: Transmission and Drivetrain\Differential Assembly\Service and Repair\Procedures\Rear Axle\Fluid Level Check)
Q: Is the check result normal?
YES: Go to Step 5.
NO: Add the fluid. Then go to Step 15.

STEP 5. Scan tool diagnostic trouble code
Check if the AWC diagnostic trouble code No. C1611, C1612, C1625, or C161D is set.(See: Diagnostic Trouble Code Descriptions\S-AWC)
Q: Is the DTC set?
YES: Perform the relevant troubleshooting.
NO: Go to Step 6.

STEP 6. Scan tool actuator test
OK: Operating sound of the electric pump can be heard.
Q: Is the check result normal?
YES: Go to Step 14.
NO: Go to Step 7.

STEP 7. Electric pump relay single unit check
Check the electric pump relay. (See: Transmission and Drivetrain\Transfer Case\Service and Repair\Procedures\Sensor, Switch and Relay)
Q: Is the check result normal?
YES: Go to Step 8.
NO: Replace the electric pump relay. Then go to Step 15.

STEP 8. Electric pump relay connector check: A-26X
Q: Is the check result normal?
YES: Go to Step 9.
NO: Repair the defective connector. Then go to Step 15.

STEP 9. Check the wiring harness between A-26X electric pump relay connector terminal No. 2 and fusible link (35).
Check the power supply line for short or open circuit.
Q: Is the check result normal?
YES: Go to Step 10.
NO: Repair the wiring harness. Then go to Step 15.

STEP 10. Electric pump connector check: F-14
Q: Is the check result normal?
YES: Go to Step 11.
NO: Repair the defective connector. Then go to Step 15.

STEP 11. Check the wiring harness between A-26X electric pump relay connector terminal No. 4 and F-14 electric pump connector terminal No. 2.
Check the power supply line for short or open circuit.
Q: Is the check result normal?
YES: Go to Step 12.
NO: Check C-21 and D-12 intermediate connectors. When no problem is found, repair the wiring harness. Then go to Step 15.

STEP 12. Check the wiring harness between F-14 electric pump connector terminal No. 1 and body ground.
Check the ground line for open circuit.
Q: Is the check result normal?
YES: Go to Step 13.
NO: Repair the wiring harness. Then go to Step 15.

STEP 13. Check whether the DTC is reset.
Q: Is DTC No. C161E set?
YES: Replace the hydraulic unit. Then go to Step 14.
NO: Intermittent malfunction.

STEP 14. Check whether the DTC is reset.
Q: Is DTC No. C161E set?
YES: Replace the AWC-ECU. Then go to Step 15.
NO: This diagnosis is complete.

STEP 15. Check whether the DTC is reset.
Q: Is DTC No. C161E set?
YES: Return to Step 2.
NO: This diagnosis is complete.

2010XMAN

Straight from All Data. Gotta love it!!

wallace989

this scares me as i just had my clutch redone now im getting this code

evokid4life

iTrader: (2)

Mine threw the same code and it was the pump ended up having it reaplaced by dealer at my cost which was $3000 with labor
good luck

ultm8mind

iTrader: (2)

So this could be solely after leaving the car in cold or freezing conditions that this error is occurring?