Fan Controls; S Y M P T O M Troubleshooting Index - Honda ACCORD HYBRID 2005 Service Manual

Fan Controls
S y m p t o m T r o u b l e s h o o t i n g I n d e x
Symptom Diagnostic Procedure
Also check for
Engine overheats 1. Inspect the water p u m p (see page 10-5).
2. Check the thermostat (see page 10-4).
3. Check for any engine coolant leakage (from
gaskets, hoses, O-rings, etc.).
4. Check for dirt, leaves, or insects on radiator
and condenser.
5. Check for a d a m a g e d or d e f o r m e d fan s h r o u d .
6. Check for a plugged or deteriorated radiator
hoses.
7. Check the radiator cap (see page 10-3).
8. Inspect the fan motors (see page 10-4) or fan
relays (see page 22-72).
9. Check for plugged heater core or hoses.
10. Check the coolant level.
11. Check for deteriorated coolant.
12. Check for a d a m a g e d cylinder head gasket.
The radiator fan runs at low speed,
but does not run at high speed w h e n
the engine coolant temperature is
above 206 °F (97 °C)
Radiator fan high speed circuit troubleshooting
(see page 10-16).
Cleanliness and
tightness of all
connectors
W i t h the A/C off and the engine
coolant temperature at 206 °F
(97 °C) or below, the A/C condenser
fan runs at high speed and the
radiator fan does not run. W h e n the
engine coolant temperature is
above 206 °F (97 °C), both fans run
at high speed
Remove the fan control relay, and test.
• If the relay is faulty, replace it.
• If the relay is OK, repair a short in the w i r e between
fan control relay 5P socket t e r m i n a l No. 1 and
condenser fan m o t o r 2P connector terminal No. 1.
Cleanliness and
tightness of all
connectors
Both the radiator fan and the A/C
condenser fan run at high speed
w i t h the ignition switch ON (II), the
A/C off, and the engine coolant
temperature below 204 °F (95 °C)
Repair a short in the w i r e between radiator fan relay
4P socket terminal No. 4 and PCM connector t e r m i n a l
E12.
Cleanliness and
tightness of all
connectors
Both the radiator fan and the A/C
condenser fan run at low speed w i t h
the ignition switch ON (II) and the
A/C off
Repair a short in the w i r e between A/C condenser fan
relay 4P socket terminal No. 4 and PCM connector
terminal E6.
Cleanliness and
tightness of all
connectors
Both the radiator fan and the A/C
condenser fan do not run at l o w
speed w i t h the A/C on
Radiator and A/C condenser fans low speed circuit
troubleshooting (see page 21-65).
Cleanliness and
tightness of all
connectors
The A/C condenser fan does not run
at all. The radiator fan does not run
at l o w speed, but it runs at high
speed
A/C condenser fans high speed circuit
troubleshooting (see page 21-69).
Cleanliness and
tightness of all
connectors
Both the radiator fan and the A/C
condenser fan do not run at high
speed w h e n the engine coolant
temperature is above 206 °F (97 °C)
Repair an open in the w i r e between radiator fan relay
4P socket terminal No. 4 and PCM connector
terminal E12.
Cleanliness and
tightness of all
connectors
10-14