DTC C1852-18 (AWD) (2019 2020 2021)

DTC C1852-18  : Solenoid Valve Circuit Low Current

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

DTC (AWD)

1. Problem verification (with engine idling)

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode.

   -4. Start the engine.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame
   C1852-18 Solenoid Valve Circuit Low Current

   Is DTC C1852-18 indicated?

   YES 

   The failure is duplicated. Go to step 3.

   NO 

   Go to step 2.

2. Problem verification (with rear differential pump motor running)

   -1. Clear the DTC with the HDS.

   -2. Turn the vehicle to the OFF (LOCK) mode.

   -3. Turn the vehicle to the ON mode.

   -4. Select the ADJUSTMENT in the AWD WITH INTELLIGENT CONTROL with the HDS.

   -5. With the engine running, do the AIR BLEEDING with the HDS .

   Air Bleeding

   Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame
   C1852-18 Solenoid Valve Circuit Low Current

   Is DTC C1852-18 indicated?

   YES 

   The failure is duplicated. Go to step 3.

   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.

3. Open wire check (DTYH line)

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

   -2. Disconnect the following connectors.

   Rear differential solenoid valve 1P connector

   AWD control unit 24P connector

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

   Test condition

   Vehicle OFF (LOCK) mode

   	Rear differential solenoid valve 1P connector: disconnected
   	AWD control unit 24P connector: disconnected
   Test point 1	Rear differential solenoid valve 1P connector (female terminals) No. 1:
   Test point 2	AWD control unit 24P connector No. 15

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

   Is there continuity?

   YES 

   The DTYH wire is not open. Go to step 4.

   NO 

   Repair an open in the DTYH wire between the rear differential solenoid valve and the AWD control unit.

4. Shorted wire check (DTYH line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Rear differential solenoid valve 1P connector: disconnected
   	AWD control unit 24P connector: disconnected
   Test point 1	AWD control unit 24P connector No. 15
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the DTYH wire between the rear differential solenoid valve and the AWD control unit.

   NO 

   The DTYH wire is OK. Go to step 5.

5. Determine possible failure area (D-GND line, others)

   -1. Disconnect the rear differential subharness D-GND/D-GND2 wire terminal (G701) from the rear differential assembly .

   -2. Check for continuity between the following test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Rear differential solenoid valve 1P connector: disconnected
   	AWD control unit 24P connector: disconnected
   	Rear differential subharness D-GND/D-GND2 wire terminal: disconnected
   Test point 1	Rear differential subharness D-GND wire terminal
   Test point 2	Body ground

   Is there continuity?

   YES 

   The D-GND wire is OK. Go to step 6.

   NO 

   Repair an open in the D-GND wire between the rear differential assembly (G701) and ground (G505).

6. Determine possible failure area (D-GND2 line, others)

   -1. Check for continuity between the following test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Rear differential solenoid valve 1P connector: disconnected
   	AWD control unit 24P connector: disconnected
   	Rear differential subharness D-GND/D-GND2 wire terminal: disconnected
   Test point 1	Rear differential subharness D-GND2 terminal
   Test point 2	Body ground

   Is there continuity?

   YES 

   The D-GND2 wire is OK. Go to step 7.

   NO 

   Repair an open in the D-GND2 wire between the rear differential assembly (G701) and ground (G505).

7. Rear differential solenoid valve check

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

   -2. On the solenoid valve side, measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Rear differential solenoid valve 1P connector: disconnected
   	AWD control unit 24P connector: disconnected
   	Rear differential subharness D-GND/D-GND2 wire terminal: disconnected
   Test point 1	Rear differential solenoid valve 1P connector (male terminals) No. 1:
   Test point 2	Rear differential solenoid valve body

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

   Is there about 100 ohms or less?

   YES 

   The rear differential solenoid valve 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 , then recheck. If this DTC goes away and the AWD control unit was substituted, replace the original AWD control unit .

   NO 

   Replace the rear differential solenoid valve .