Honda HR-V: AWD System Symptom Troubleshooting - Abnormal Noise (AWD)

NOTE: If necessary, compare the noise with a known-good vehicle of the same type. If the noise is remarkably abnormal, do the following troubleshooting.

1. Problem verification (abnormal noise check) 1.

1. Test drive the vehicle and check for the abnormal noise.

Did the abnormal noise reappear?

YES

The failure is duplicated. Go to step 2.

NO

Check the following items.

• Check the rear differential fluid level and the fluid condition.
• Check for rear differential fluid leaks.
• Check for interference with items such as the harness.
• Rotate either rear wheel by hand, and check that the other wheel rotates.
• Do the OIL PRESSURE CONTROL TEST in the FUNCTIONAL TEST with the HDS.
• Do the rear differential fluid pressure sensor test.

2. Rear differential visual check.

1. Check the following items.
   • Check the rear differential fluid level and the fluid condition.
   • Check for rear differential fluid leaks.
   • Check for interference with items such as the harness.

Are the check results OK?

YES

The rear differential visual is OK. Go to step 3.

NO

Replace the rear differential fluid or add recommended fluid.

3. Problem verification (rear differential companion flange rotate check).

1. Release the parking brake.
2. Shift the transmission to N position.
3. Raise the vehicle on a lift.
4. Make a reference mark (A) across the No. 2 propeller shaft and the rear differential companion flange.

5. Remove the No. 2 propeller shaft flange bolts from the rear differential companion flange.
6. Rotate the companion flange by hand.

Can the rear differential companion flange be rotated smoothly by hand?

YES

Go to step 4.

NO

The failure is duplicated. Replace the torque control differential (TCD) assembly or the differential carrier assembly.

4. Rear differential operation check.

1. Rotate either rear wheel by hand, and check that the other wheel rotates.

Does the other wheel rotate?

YES

The rear differential operation is OK. Go to step 5.

NO

Replace the differential carrier assembly.

5. Torque control differential (TCD) assembly check.

1. Realign the reference marks (A) on the No. 2 propeller shaft and the rear differential companion flange, then install new No. 2 propeller shaft flange bolts.

Fig. 1: Propeller Shaft With Torque Specifications

2. Remove the following fuse.

3. Test-drive the vehicle on the lift.

Is the abnormal noise still present?

YES

Replace the torque control differential (TCD) assembly.

NO

The torque control differential (TCD) assembly is OK. Go to step 6.

6. Rear differential solenoid valve check.

1. Select FUNCTIONAL TEST in the AWD WITH INTELLIGENT CONTROL with the HDS.
2. Select the SOLENOID TEST in the FUNCTIONAL TEST with the HDS.
3. Do LEVEL 7 of the SOLENOID TEST with the HDS.

Solenoid Test

4. Do LEVEL 1 of the SOLENOID TEST with the HDS.

Solenoid Test

Did the abnormal noise happen when changing from LEVEL 7 to LEVEL 1?

YES

Replace the rear differential solenoid valve.

NO

The rear differential solenoid valve is OK. Go to step 7.

7. Rear differential pump motor check.

1. Select ADJUSTMENT in the AWD WITH INTELLIGENT CONTROL with the HDS.
2. Do the AIR BLEEDING in the ADJUSTMENT with the HDS.

Air Bleeding

3. Listen for any abnormal noise coming from the rear differential pump motor.

Did abnormal noise happen while doing Air Bleeding?

YES

Replace the rear differential pump motor.

NO

The rear differential pump motor is OK. Go to step 8.

8. Problem verification (abnormal noise check) 2.

1. Replace the rear differential fluid.
2. Select ADJUSTMENT in the AWD WITH INTELLIGENT CONTROL with the HDS.
3. Do the AIR BLEEDING in the ADJUSTMENT with the HDS.

Air Bleeding

4. Test-drive the vehicle on the lift.

Did abnormal noise reappear?

YES

The failure is duplicated. Replace the torque control differential (TCD) assembly or the differential carrier assembly.

NO

Intermittent failure, the system is OK at this time.

AWD System Symptom Troubleshooting - HDS Does Not Communicate (AWD)

1. HDS communication check.

1. Turn the vehicle to the ON mode.
2. Check that the HDS communicates with the vehicle.

Does the HDS communicate with the vehicle?

YES

The HDS communication is OK. Go to step 2.

NO

Go to the DLC circuit troubleshooting - Refer to: Fuel and Emissions Systems DTC Troubleshooting Index (KA/KC), or CVT System DTC Troubleshooting Index (KA/KC CVT).

2. AWD with intelligent control system communication check.

Check the Main Menu of the AWD WITH INTELLIGENT CONTROL with the HDS.

Does the HDS show the Main Menu of the AWD WITH INTELLIGENT CONTROL?

YES

The AWD with intelligent control system communication is OK. Intermittent failure, the system is OK at this time.

NO

Go to step 3.

3. Fuse check.

1. Turn the vehicle to the OFF (LOCK) mode.
2. Check the following fuse.

Is the fuse OK?

YES

The fuse is OK. Reinstall the fuse, then go to step 4.

NO

Repair a short to ground in the No. C39 (10 A) fuse circuit.

4. Rear differential pump motor operation check.

1. Turn the vehicle to the ON mode.
2. Check the operation sound of the rear differential pump motor on the rear differential with a stethoscope or a flat-tipped screwdriver (at the rear differential pump motor) when the engine started.

NOTE: The rear differential pump motor operates within several seconds after the engine is started.

Is the AWD relay OK?

NO

Repair an open in the F-CAN_H and/or F-CAN_L wires.

YES

Go to step 5.

5. Rear differential fluid pressure sensor check.

1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the following connector.

Rear differential fluid pressure sensor 3P connector

3. Turn the vehicle to the ON mode.
4. Check the Main Menu of the AWD WITH INTELLIGENT CONTROL with the HDS.

Does the HDS show the Main Menu of the AWD WITH INTELLIGENT CONTROL?

YES

The rear differential fluid pressure sensor is OK. Go to step 6.

NO

Replace the rear differential fluid pressure sensor.

6. Open wire check (IG1 OPTION line).

1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the following connector.

AWD control unit 24P connector

3. Start the engine.
4. Measure the voltage between test points 1 and 2.

Is there battery voltage?

YES

The IG1 OPTION wire is OK. Go to step 7.

NO

Repair an open in the IG1 OPTION wire between the AWD control unit and the No. C39 (30 A) fuse in the under-hood fuse/relay box.

7. Open wire check (GND line).

1. Turn the vehicle to the OFF (LOCK) mode.
2. Check for continuity between test points 1 and 2.

Is there continuity?

YES

The GND wire is OK. Go to step 8.

NO

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

8. Shorted wire check (SVCC line).

1. Turn the vehicle to the OFF (LOCK) mode.
2. Check for continuity between test points 1 and 2.

Is there continuity?

YES

Repair a short to ground in the SVCC wire between the AWD control unit and the rear differential fluid pressure sensor.

NO

The SVCC wire is OK. Go to step 9.

9. Open wire check (F-CAN_H, F-CAN_L lines).

1. Turn the vehicle to the OFF (LOCK) mode.
2. Check for continuity between test points 1 and 2.

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.

NO

Repair an open in the F-CAN_H and/or F-CAN_L wires between the AWD control unit and the DLC.

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