Honda HR-V Owners & Service Manuals

Honda HR-V: Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting

Honda HR-V (2015-2021) Service Manual / Engine / Engine Cooling System - Testing & Troubleshooting / Troubleshooting / Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting

NOTE:

  • Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the symptom troubleshooting index - Refer to: Heating and A/C Systems Symptom Troubleshooting Index (Heating/Air Conditioning), or Climate Control System Symptom Troubleshooting Index (Climate Control).
  • If the A/C system is inoperable, the radiator and A/C condenser fans are controlled based only on engine coolant temperature.
  • Before doing symptom troubleshooting, check for PGM-FI DTCs - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the CVT System (CVT).

1. Fuse check.

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

Engine Cooling System - Testing & Troubleshooting

Is the fuse OK?

YES

Go to step 2.

NO

Replace the fuse, and recheck. If the fuse blows again, repair a short in the No. B12 (30 A) fuse circuit.

2. A/C signal output check.

  1. Connect the HDS to the DLC.
  2. Turn the vehicle to the ON mode. Make sure the A/C system is OFF, then start the engine.
  3. Turn the heater fan switch ON, then momentarily turn ON the A/C with the A/C button.

    NOTE: Do not run the A/C for more than a few seconds with the engine running or damage to the A/C system will result.

  4. Check the parameter below with the HDS.

Engine Cooling System - Testing & Troubleshooting

Is the FAN LOW CTRL on with the A/C on?

YES

Go to step 3.

NO

Update the PCM if it does not have the latest software, or substitute a known-good PCM, and recheck.

3. Radiator and A/C condenser fan low speed operation check (FAN LO SIGNAL lines).

  1. Turn the vehicle to the OFF (LOCK) mode.
  2. Jump the SCS line with the HDS.

SCS Short

NOTE: This step must be done to protect the PCM from damage.

  1. Disconnect the following connector.

PCM connector A (51P)

  1. Connect terminals A and B with jumper wire.

Engine Cooling System - Testing & Troubleshooting

  1. Turn the vehicle to the ON mode.

Do the A/C condenser and radiator fans run on low?

YES

Update the PCM if it does not have the latest software, or substitute a known-good PCM, and recheck.

NO

Go to step 4.

4. Radiator fan relay and fan control relay check.

  1. Turn the vehicle to the OFF (LOCK) mode.
  2. Remove the radiator fan relay and the fan control relay from the under-hood fuse/relay box, and test it.

Are the relays OK?

YES

Go to step 5.

NO

Replace the radiator fan relay and/or fan control relay.

5. Open wire check (+B MAIN FAN line).

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

Engine Cooling System - Testing & Troubleshooting

Engine Cooling System - Testing & Troubleshooting

Is there battery voltage?

YES

The +B MAIN FAN wire is OK. Go to step 6.

NO

Repair an open in the wire between the No. B12 (30 A) fuse in the under-hood fuse/relay box and the radiator fan relay.

6. Determine possible failure area (radiator fan relay switch side circuit, radiator fan relay coil side circuit).

  1. Connect terminals A and B with a jumper wires.

Engine Cooling System - Testing & Troubleshooting

Engine Cooling System - Testing & Troubleshooting

Engine Cooling System - Testing & Troubleshooting

Do the A/C condenser and radiator fans run on low?

YES

Go to step 7.

NO

Go to step 8.

7. Open wire check (IG2 A/C line).

  1. Disconnect the jumper wires.
  2. Turn the vehicle to the ON mode.
  3. Measure the voltage between test points 1 and 2.

Engine Cooling System - Testing & Troubleshooting

Engine Cooling System - Testing & Troubleshooting

Is there battery voltage?

YES

The IG2 A/C wire is OK. Repair an open in the wire between the radiator fan relay and the PCM.

NO

Repair an open in the wire between the No. C24 (7.5 A) fuse in the under-dash fuse/relay box and the radiator fan relay.

8. Radiator fan motor and A/C condenser fan motor test.

  1. Test the radiator fan motor and the A/C condenser fan motor.

Are the radiator fan motor and the A/C condenser fan motor OK?

YES

Go to step 9.

NO

Replace the radiator fan motor and/or the A/C condenser fan motor.

9. Open wire check (MAIN FAN MOTOR line).

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

Engine Cooling System - Testing & Troubleshooting

Engine Cooling System - Testing & Troubleshooting

Is there battery voltage?

YES

The MAIN FAN MOTOR wire is OK. Go to step 10.

NO

Repair an open in the wire between the radiator fan relay and the radiator fan motor.

10.Open wire check (SUB FAN MTR/FAN HI/LO RLY COM line).

  1. Reconnect the radiator fan motor 2P connector.
  2. Measure the voltage between test points 1 and 2.

Engine Cooling System - Testing & Troubleshooting

Engine Cooling System - Testing & Troubleshooting

Is there battery voltage?

YES

The SUB FAN MTR/FAN HI/LO RLY COM wire is OK. Check for an open in the wire between the A/C condenser fan motor and body ground. If the wire is OK, check for poor ground at G301.

NO

Go to step 11.

11.Open wire check (FAN HI/LO RLY COM line).

  1. Disconnect the jumper wire from the fan control relay 5P socket.
  2. Measure the voltage between test points 1 and 2.

Engine Cooling System - Testing & Troubleshooting

Engine Cooling System - Testing & Troubleshooting

Is there battery voltage?

YES

The FAN HI/LO RLY COM wire is OK. Repair an open in the wire between the fan control relay and the A/C condenser fan motor.

NO

Repair an open in the wire between the radiator fan motor and the fan control relay.

WIRING DIAGRAM

FANS ELECTRONIC WIRING DIAGRAM

Refer to Appropriate Diagram Cooling Fan

COMPONENT LOCATION INDEX

COOLING FAN CONTROLS COMPONENT LOCATION INDEX

Engine Cooling System - Testing & Troubleshooting

COOLING SYSTEM COMPONENT LOCATION INDEX

Engine Cooling System - Testing & Troubleshooting

    READ NEXT:

     Engine Mount - Service Information

    REMOVAL & INSTALLATION ENGINE MOUNT TIGHTENING PROCEDURE Procedure NOTE: Reinstall the mounting bolts and nuts in the sequence given in the following steps. Failure to follow this sequence may ca

     Exhaust System - Service Information

    REMOVAL & INSTALLATION EXHAUST PIPE AND MUFFLER REMOVAL AND INSTALLATION (KA/KC) Removal and Installation NOTE: Use new gaskets and new self-locking nuts when reassembling. 1. Exhaust Pipe and Muf

     Fuel and Emissions - Service Information

    SEE MORE:

     DTC Troubleshooting C0062-76: Longitudinal Acceleration Sensor (Inside of Electric Parking Brake Control Unit) Adjustment Condition Incorrect

    NOTE: Before you troubleshoot, review the how to troubleshoot the electric parking brake system. Before troubleshooting, check the electric parking brake control unit for proper mounting. If not properly installed the electric parking brake control unit may set this code. 1. Problem verifi

     Valves & Valve Seats

    NOTE: Examples used in this article are general in nature and do not necessarily relate to a specific engine or system. Illustrations and procedures have been chosen to guide mechanic through engine overhaul process. Descriptions of processes of cleaning, inspection, assembly and machine shop pract

    © 2019-2024 Copyright www.hohrv2.com