DTC C1852-18 (62-01) (AWD) (2016 2017 2018)

WARNING: This page is about a different variant/trim than selected.

DTC C1852-18 : Solenoid Valve Circuit Low Current

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

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

DTC (Real Time AWD)

Problem verification (with engine idling)

-1. Turn the vehicle to the ON mode.

-2. Clear the DTC with the HDS.

-3. Start the engine.

-4. 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.

Go to step 2.

Problem verification (with rear differential pump motor running)

-1. Clear the DTC with the HDS.

-2. Select the ADJUSTMENT in the AWD WITH INTELLIGENT CONTROL with the HDS.

-3. With the engine running, do the AIR BLEEDING in the ADJUSTMENT 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.

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.

Determine possible failure area (GND line, others)

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

Test condition	Vehicle ON mode (idling)
Test point 1	Rear differential body
Test point 2	Body ground

Is there continuity?

YES

Go to step 6.

Go to step 4.

Open wire check (GND line)

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

-2. Disconnect the following connector.

AWD control unit 24P connector

-3. Check for continuity between the following test points 1 and 2 individually (see table).

Test condition	Vehicle OFF (LOCK) mode
	AWD control unit 24P connector: disconnected

Connector	Test point 1	Test point 2
AWD control unit 24P connector	No. 4	Body ground
AWD control unit 24P connector	No. 8	Body ground

Is there continuity?

YES

The GND wires are OK. Go to step 5.

Repair an open in the GND wires between AWD control unit and ground (G505).

Open wire check (DG line)

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

Test condition	Vehicle OFF (LOCK) mode
	AWD control unit 24P connector: disconnected
Test point 1	AWD control unit 24P connector No. 5
Test point 2	Rear differential body

Is there continuity?

YES

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

Check for poor connections or loose terminals between the AWD control unit and the rear differential body ground (G701). If the connections are OK, repair an open in the DG wire between the rear differential body and the AWD control unit.

Determine possible failure area (DTYH line, others)

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

-2. Disconnect the following connector.

Rear differential solenoid valve 1P connector

-3. Turn the vehicle to the ON mode.

-4. Wait for 10 seconds.

-5. Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	Rear differential solenoid valve 1P connector: disconnected
Test point 1	Rear differential solenoid valve 1P connector No. 1
Test point 2	Body ground

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

Is there about 0.1 V or less?

YES

Go to step 8.

Go to step 7.

Shorted wire check (DTYH 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 solenoid valve 1P connector: disconnected
	AWD control unit 24P connector: disconnected
Test point 1	Rear differential solenoid valve 1P connector No. 1
Test point 2	Body ground

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

Is there about 0.1 V or less?

YES

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

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
Test point 1	Rear differential solenoid valve 1P connector 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. Go to step 9.

Replace the rear differential solenoid valve .

Shorted wire check (DTYH line)

-1. Disconnect the following connector.

AWD control unit 24P connector

-2. 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 DTHY wire between the rear differential solenoid valve and the AWD control unit.

The DTYH wire is not shorted. Go to step 10.

Open 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 circuit	DTHY
Test point 1	Rear differential solenoid valve 1P connector No. 1
Test point 2	AWD control unit 24P connector No. 15

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

Is there continuity?

YES

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