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Honda Ridgeline. Manual - part 402

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YES

21-44

Heating/Air Conditioning

A/C Condenser Fan High Speed Circuit Troubleshooting

FAN CONTROL RELAY 5P SOCKET

BLU/YEL

FAN CONTROL RELAY 5P SOCKET

BLK

NOTE:

• Do not use this troubleshooting procedure if the

radiator fan and/or the A/C compressor is inoperative.
Refer to the symptom troubleshooting index.

• Before performing symptom troubleshooting, check

for powertrain DTCs (see page 11-3).

1. Check the No. 30 (7.5 A) fuse in the under-dash

fuse/relay box.

Go to step 2.

Replace the fuse, and recheck. If the fuse

blows again, check for a short in the No. 30 (7.5 A)
fuse circuit.

2. Remove the fan control relay from the auxiliary

under-hood relay box, and test it (see page 22-75).

Go to step 3.

Replace the fan control relay.

3. Turn the ignition switch ON (II).

4. Measure the voltage between the No. 5 terminal of

the fan control relay 5P socket and body ground.

Go to step 5.

Go to step 9.

5. Turn the ignition switch OFF.

6. Check for continuity between the fan control relay

5P socket No. 2 terminal and body ground.

Go to step 7.

Check for an open in the wire between the fan

control relay and body ground. If the wire is OK,
check for poor ground at G201 (see page 22-68).

7. Remove the radiator fan relay from the auxiliary

under-hood fuse/relay box.

Is the f use OK ?

Is the r elay OK ?

Is ther e batter y voltage?

Is ther e continuity?

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YES

21-45

FAN CONTROL RELAY 5P SOCKET

RADIATOR FAN RELAY 4P SOCKET

GRN

A/C DIODE A

A/C DIODE 4P SOCKET

BLK/YEL

8. Check for continuity between the fan control relay

5P socket No. 3 terminal and the radiator fan relay
4P socket No. 3 terminal.

Repair open in the GRN wire between the

radiator fan relay No. 3 terminal and the PCM A5
terminal.

Repair open in the wire between the fan

control relay and the radiator fan relay.

9. Remove A/C diode A from right engine

compartment wire harness.

10. Using the diode setting(

) on a DVOM, check

for current flow in both directions between the A/C
diode A No. 1 and No. 2 terminals.

Go to step 11.

Replace A/C diode A.

11. Turn the ignition switch ON (II).

12. Measure the voltage between the A/C diode 4P

socket No. 2 terminal and body ground.

Repair open in the wire between A/C diode A

and the condenser fan control relay.

Repair open in the wire between the No. 30

(7.5 A) fuse in the under-dash fuse/relay box and
A/C diode A.

Is ther e continuity?

Is ther e cur r ent f low in only one dir ection?

Is ther e batter y voltage?

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YES
NO

YES

21-46

Heating/Air Conditioning

Radiator and A/C Condenser Fan High Speed Circuit Troubleshooting

A/C PRESSURE SWITCH 4P CONNECTOR

BLK

RED/GRN

JUMPER WIRE

BLK

A/C PRESSURE SWITCH 4P CONNECTOR

PCM CONNECTOR A (44P)

A/C PRESSURE SWITCH 4P CONNECTOR

RED/GRN

NOTE:

• Do not use this troubleshooting procedure if only one

fan is inoperative, or if the A/C compressor is
inoperative. Refer to the symptom troubleshooting
index.

• Before performing symptom troubleshooting, check

for powertrain DTCs (see page 11-3).

• The normal operating A/C pressure for the radiator

and A/C condenser fans to run at high speed is
1,520 kPa (15.5 kgf/cm , 221 psi).

1. Check the No. 19 (30 A) fuse and No. 20 (30 A) fuse

in the under-hood fuse/relay box, and the No. 30
(7.5 A) fuse in the under-dash fuse/relay box.

Go to step 2.

Replace the fuse(s), and recheck.

2. Using the HDS, confirm the following values in the

Data List at idle.

A/C SWITCH

A/C CLUTCH

Fan Low Speed

Fan High Speed

Go to step 3.

Troubleshoot the value that is not the

specifications.

3. Turn the ignition switch OFF.

4. Disconnect the A/C pressure switch 4P connector.

5. Check for continuity between the A/C pressure

switch 4P connector No. 2 terminal and body
ground.

Go to step 6.

Check for an open in the wire between the A/C

pressure switch and body ground. If the wire is OK,
check for poor ground at G202 (see page 22-68).

6. Turn the ignition switch ON (II), then set the A/C

button and fan control dial to ON.

7. Connect the A/C pressure switch 4P connector

No. 2 and No. 3 terminals with a jumper wire.

Replace the A/C pressure switch.

Go to step 8.

8. Jump the SCS line with the HDS.

NOTE: This step must be done to protect the
powertrain control module (PCM) from damage.

9. Disconnect PCM connector A (44P).

10. Check for continuity between the PCM connector A

(44P) No. 37 terminal and the A/C pressure switch
4P connector No. 3 terminal.

Check for loose wires or poor connections at

PCM connector A (44P). If the connections are good,
substitute a known-good PCM, and recheck. If the
symptom/indication goes away, replace the
original PCM (see page 11-205).

Repair open in the wire between the PCM and

A/C pressure switch.

Wire side of female terminals

Terminal side of female terminals

Wire side of female terminals

Ar e the f uses OK ?

Ar e all the values OK ?

Is ther e continuity?

Do the r adiator and condenser f ans r un at high
speed?

Is ther e continuity?

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−

YES

21-47

A/C Compressor Clutch Circuit Troubleshooting

A/C COMPRESSOR CLUTCH RELAY 4P SOCKET

JUMPER WIRE

BLU/RED

A/C COMPRESSOR CLUTCH RELAY 4P SOCKET

NOTE:

• It is normal for the A/C compressor to turn off under

certain conditions, such as low idle, high engine
coolant temperature, or hard acceleration.

• Do not use this troubleshooting procedure if the fans

are also inoperative with the A/C on. Refer to the
symptom troubleshooting index.

• Before doing any symptom troubleshooting, check

for powertrain DTCs (see page 11-3).

1. Check the No. 12 (7.5 A) fuse in the under-hood

fuse/relay box, and the No. 30 (7.5 A) fuse in the
under-dash fuse/relay box.

Go to step 2.

Replace the fuses and recheck. If the fuses

blow again, check for a short in the No. 12 (7.5 A)
and No. 30 (7.5 A) fuses circuit.

2. Connect the HDS to the DLC (see page 21-8).

3. Start the engine.

4. Turn on the A/C on the HVAC control unit.

5. Check the A/C CLUTCH in the PGM-FI Data List with

the HDS.

Go to step 7.

Go to step 6.

6. Check the engine coolant temperature and idle

speed (use the HDS PGM-FI data list if possible).

ECT Sensor 2

169

194 °F (76

90 °C)

TP sensor

About 0.5 V at idle

RPM

More than 730

Go to step 7.

Troubleshoot and repair the cause of the high

engine coolant temperature or low idle.

7. Remove the A/C compressor clutch relay from the

under-hood fuse/relay box, and test it (see page
22-75).

Go to step 8.

Replace the A/C compressor clutch relay.

8. Measure the voltage between the A/C compressor

clutch relay 4P socket No. 1 terminal and body
ground.

Go to step 9.

Replace the under-hood fuse/relay box

(see page 22-72).

9. Connect the A/C compressor clutch relay 4P socket

No. 1 and No. 2 terminals with a jumper wire.

Go to step 10.

Go to step 19.

(cont’d)

Ar e the f uses OK ?

Is the A/ C CLUT CH on?

Ar e the coolant temper atur e and idle speed OK ?

Is the r elay OK ?

Is ther e batter y voltage?

Does the A/ C compr essor clutch click?

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