DTC C1841-13

DTC C1841-13  : Differential Fluid Temperature Sensor Circuit High Voltage

NOTE:  Before you troubleshoot, review the General Troubleshooting Information .

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	More than 4.9	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. Determine possible failure area (short to power in TOH line, others)

   -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. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Rear differential fluid temperature sensor 2P connector: disconnected
   Test point 1	Rear differential fluid temperature sensor 2P connector (female terminals) No. 1:
   Test point 2	Body ground

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

   Is there about 4.9 V or more?

   YES 

   Go to step 5.

   NO 

   Go to step 3.

3. Open wire check (TOH line)

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

   -2. Disconnect the following connector.

   AWD control unit 24P connector

   -3. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF mode
   	Rear differential fluid temperature sensor 2P connector: disconnected
   	AWD control unit 24P connector: disconnected
   Test point 1	AWD control unit 24P connector No. 18
   Test point 2	Rear differential fluid temperature sensor 2P connector (female terminals) No. 1:

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

   Is there 1.0 Ω or less?

   YES 

   The TOH wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good AWD control unit , and recheck. If the symptom/indication goes away with a known-good AWD control unit, replace the original AWD control unit .

   NO 

   Repair an open in the TOH wire between the rear differential fluid temperature sensor and the AWD control unit.

4. Open wire check (TOL line)

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

   -2. Remove the jumper wire.

   -3. Disconnect the following connector.

   AWD control unit 24P connector

   -4. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Rear differential fluid temperature sensor 2P connector: disconnected
   	AWD control unit 24P connector: disconnected
   Test point 1	AWD control unit 24P connector No. 22
   Test point 2	Rear differential fluid temperature sensor 2P connector (female terminals) No. 2:

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

   Is there 1.0 Ω or less?

   YES 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good AWD control unit , and recheck. If the symptom/indication goes away with a known-good AWD control unit, replace the original AWD control unit .

   NO 

   Repair an open in the TOL wire between the rear differential fluid temperature sensor and the AWD control unit.

5. Shorted wire check (TOH line to power)

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

   -2. Disconnect the following connector.

   AWD control unit 24P connector

   -3. Turn the vehicle to the ON mode.

   -4. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Rear differential fluid temperature sensor 2P connector: disconnected
   	AWD control unit 24P connector: disconnected
   Test point 1	Rear differential fluid temperature sensor 2P connector (female terminals) No. 1:
   Test point 2	Body ground

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

   Is there about 0.5 V or more?

   YES 

   Repair a short to power in the TOH wire between the rear differential fluid temperature sensor and the AWD control unit.

   NO 

   Go to step 6.

6. Rear differential fluid temperature sensor check

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

   -2. Connect the following connector.

   AWD control unit 24P connector

   -3. Connect terminals A and B with a jumper wire.

   Terminal A	Rear differential fluid temperature sensor 2P connector (female terminals) No. 1:
   Terminal B	Rear differential fluid temperature sensor 2P connector (female terminals) No. 2:

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

   -4. Turn the vehicle to the ON mode.

   -5. 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 0.1	V

   Do the current condition(s) match the threshold?

   YES 

   Replace the rear differential fluid temperature sensor .

   NO 

   Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good AWD control unit , and recheck. If the symptom/indication goes away with a known-good AWD control unit, replace the original AWD control unit .