DTC C1841-11 (42-02): Differential Fluid Temperature Sensor Circuit Low Voltage

NOTE:  Before you troubleshoot, HOW TO TROUBLESHOOT THE REAL TIME AWD SYSTEM (AWD) .

DTC (Real Time AWD)

1. Problem verification

   - 1. Turn the vehicle to the ON mode.

   - 2. Check the parameter(s) below with the HDS.

   Signal	Threshold		Current Conditions
   	Values	Unit	Values	Unit
   Voltage of the oil temperature sensor for rear differential	Less than 0.08	V

   Do the current condition(s) match the threshold?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the Freeze data/on-board snapshot.

2. Rear differential fluid temperature sensor check

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   Rear differential fluid temperature sensor 2P connector

   - 3. Turn the vehicle to the ON mode.

   - 4. Check the parameter(s) below with the HDS.

   Signal	Threshold		Current Conditions
   	Values	Unit	Values	Unit
   Voltage of the oil temperature sensor for rear differential	About 5	V

   Do the current condition(s) match the threshold?

   YES 

   Replace the REAR DIFFERENTIAL FLUID PRESSURE SENSOR REMOVAL & INSTALLATION(AWD) .

   NO 

   The rear differential fluid temperature sensor is OK. Go to step 3.

3. Shorted wire check (TOH line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   Real time AWD control unit 24P connector

   - 3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Rear differential fluid temperature sensor 2P connector: disconnected
   	Real time AWD control unit 24P connector: disconnected
   Test point 1	Rear differential fluid temperature sensor 2P connector No. 1
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Repair a short to ground or the TOL wire in the TOH wire between the rear differential fluid temperature sensor and the real time AWD control unit.

   NO 

   Update the real time AWD control unit if it does not have the latest software , or substitute a known-good real time AWD control unit , and recheck. If the symptom/indication goes away with the updated real time AWD control unit, troubleshooting is complete. If the symptom/indication goes away with a known-good real time AWD control unit, replace the original real time AWD control unit .