DTC Troubleshooting: C1858-72 (71-02) (AWD) - Honda CR-V RW/RT 2017-2020

DTC Troubleshooting: C1858-72 (71-02)

DTC C1858-72: Differential Fluid Pressure Deviation Low

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

DTC Description	DTC	Freeze Frame
C1858-72 Differential Fluid Pressure Deviation Low

Rear differential fluid level check:

Rear differential fluid level check

?1.	Check the rear differential fluid level, and check for rear differential fluid leakage.

Is the check result OK?


	YES

The rear differential fluid level is OK. Go to step 2.


	NO

Find and repair the source of the fluid leak then add recommended fluid.?

Problem verification (function test with HDS):

Problem verification (function test with HDS)

?1.	Turn the vehicle to the ON mode.

?2.	Select the FUNCTIONAL TEST in the REAL TIME AWD with the HDS.

?3.	Do the OIL PRESSURE CONTROL TEST in the FUNCTIONAL TEST with the HDS.

Is fault code indicated?


	Fault code is not indicated

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.?


	Fault code 2-1 or 5-1 is indicated

Go to step 3.


	Fault code 3-1 is indicated

Go to step 4.


	Fault code except 2-1, 3-1, and 5-1 is indicated

Go to step 5.

Hydraulic system check:

Hydraulic system check

?1.	Select the ADJUSTMENT in the REAL TIME AWD with the HDS.

?2.	Do the AIR BLEEDING in the ADJUSTMENT with the HDS.

?3.	Select the FUNCTIONAL TEST in the REAL TIME AWD with the HDS.

?4.	Do the OIL PRESSURE CONTROL TEST in the FUNCTIONAL TEST with the HDS.

Is the test result OK?


	YES

Hydraulic system is OK at this time.?


	NO

Replace the rear differential fluid then do the rear differential fluid pressure sensor test and do the rear differential solenoid valve test. If they are OK, replace the rear differential assembly.?

Hydraulic system check:

Hydraulic system check

?1.	Select the ADJUSTMENT in the REAL TIME AWD with the HDS.

?2.	Do the AIR BLEEDING in the ADJUSTMENT with the HDS.

?3.	Select the FUNCTIONAL TEST in the REAL TIME AWD with the HDS.

?4.	Do the OIL PRESSURE CONTROL TEST in the FUNCTIONAL TEST with the HDS.

Is the test result OK?


	YES

Hydraulic system is OK at this time.?


	NO

Replace the rear differential fluid, then do the rear differential solenoid valve test. If it is OK, replace the rear differential assembly.?

DTC check:

DTC check

?1.	Select the FUNCTIONAL TEST in the REAL TIME AWD with the HDS.

?2.	Do the OIL PRESSURE CONTROL TEST in the FUNCTIONAL TEST with the HDS three times.

?3.

Check for DTCs with the HDS.

DTC Description	DTC	Freeze Frame

Are there any DTCs?


	YES

Go to the indicated DTC's troubleshooting.?


	NO

The system is OK at this time.?