Honda HR-V Owners & Service Manuals

Honda HR-V: DTC C1858-72 (71-02): Differential Fluid Pressure Deviation Low (AWD)

Honda HR-V (2015-2021) Service Manual / Driveline & Axles / AWD System - Diagnostics / DTC C1858-72 (71-02): Differential Fluid Pressure Deviation Low (AWD)

NOTE: Before you troubleshoot, review the General Troubleshooting Information for the AWD with intelligent control system.

AWD System - Diagnostics

1. Rear differential fluid level check:

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.

2. Problem verification (function test with HDS):

  1. Turn the vehicle to the ON mode.
  2. Select FUNCTIONAL TEST in the AWD WITH INTELLIGENT CONTROL with the HDS.
  3. Do the OIL PRESSURE CONTROL TEST in the FUNCTIONAL TEST with the HDS.

Oil Pressure Control Test

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.

3. Hydraulic system check:

  1. Select ADJUSTMENT in the AWD WITH INTELLIGENT CONTROL with the HDS.
  2. Do the AIR BLEEDING in the ADJUSTMENT with the HDS.
  3. Select FUNCTIONAL TEST in the AWD WITH INTELLIGENT CONTROL with the HDS.
  4. Do the OIL PRESSURE CONTROL TEST in the FUNCTIONAL TEST with the HDS.

Oil Pressure Control Test

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.

4. Hydraulic system check:

  1. Select ADJUSTMENT in the AWD WITH INTELLIGENT CONTROL with the HDS.
  2. Do the AIR BLEEDING in the ADJUSTMENT with the HDS.
  3. Select FUNCTIONAL TEST in the AWD WITH INTELLIGENT CONTROL with the HDS.
  4. Do the OIL PRESSURE CONTROL TEST in the FUNCTIONAL TEST with the HDS.

Oil Pressure Control Test

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.

5. DTC check:

  1. Select FUNCTIONAL TEST in the AWD WITH INTELLIGENT CONTROL 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.

AWD System - Diagnostics

Are there any DTCs?

YES

Go to the indicated DTC's troubleshooting.

NO

The system is OK at this time.

DTC C1858-73 (71-01): DIFFERENTIAL FLUID PRESSURE DEVIATION HIGH (AWD)

NOTE: Before you troubleshoot, review the General Troubleshooting Information for the AWD with intelligent control system.

AWD System - Diagnostics

1. Problem verification (function test with HDS):

  1. Turn the vehicle to the ON mode.
  2. Select FUNCTIONAL TEST in the AWD WITH INTELLIGENT CONTROL with the HDS.
  3. Do the OIL PRESSURE CONTROL TEST in the FUNCTIONAL TEST with the HDS.

Oil Pressure Control Test

Are fault codes 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 4-1 or 6-1 is indicated

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

Fault code except 4-1 and 6-1 is indicated

The failure is duplicated. Go to step 2.

2. DTC check:

  1. Select FUNCTIONAL TEST in the AWD WITH INTELLIGENT CONTROL 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.

AWD System - Diagnostics

Are there any DTCs?

YES

Go to the indicated DTC's troubleshooting.

NO

The system is OK at this time.

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