Symptom Troubleshooting Index - Honda Accord 2008 Manual

07/11/02 09:39:19 61TA0000_210_0012

Symptom Troubleshooting Index

Symptom
Recirculation control
doors do not change
between Fresh and
Recirculate (4-door
with A/T)
Blower, heater controls,
and A/C do not work
The A/C condenser fan
does not run at all (but
radiator fan runs with
the A/C on)
Both fans do not run
with the A/C on (but the
A/C compressor runs
with the A/C on)
The A/C compressor
clutch does not engage
(but both fans run with
the A/C on)
A/C system does not
come on (both fans and
the A/C compressor do
not work); heater is OK
Insufficient heating
ＴＡ０８ＡＨＡＧ２４１００００００００ＨＢＡＴ０１
Diagnostic procedure
Recirculation control motor circuit troubleshooting
(see page 21-40)
HVAC control power and ground circuit
troubleshooting (see page 21-42)
A/C condenser fan circuit troubleshooting
(see page 21-43)
Radiator and A/C condenser fan common circuit
troubleshooting (see page 21-44)
A/C compressor clutch circuit troubleshooting
(see page 21-45)
A/C pressure switch circuit troubleshooting
(see page 21-48)
1. Check the coolant level (see page 10-6)
2. Check the radiator cap (see page 10-3)
3. Check the operation of the air mix control
motor and door (see page 21-52)
4. Check the coolant temperature
5. Check the blower motor unit for obstructions
6. Check for air leaks around the ducts and vents
7. Check the inlet hose temperature
• If it is COLD, check for restrictions in the hose,
a damaged or leaking thermostat, and a
damaged or leaking water pump.
• If it is HOT, check for restrictions in the
heater core. Back flush the heater core or
replace the heater core.
Also check for
• HVAC DTCs (see page 21-9)
• Blown fuse No. 16 (7.5 A) in the
driver's under-dash fuse/relay
box
• Cleanliness and tightness of all
terminals
• HVAC DTCs (see page 21-9)
• Blown fuse No. 16 (7.5 A) in the
driver's under-dash fuse/relay
box
• Poor ground at G401
• Cleanliness and tightness of all
terminals
• HVAC DTCs (see page 21-9)
• Blown fuse No. 5 (20 A) in the
under-hood fuse/relay box
• Poor ground at G302
• Cleanliness and tightness of all
terminals
• HVAC DTCs (see page 21-9)
• Blown fuse No. 5 (20 A) and
No. 3 (MAIN FAN MTR) (30 A) in
the under-hood fuse/relay box
• Cleanliness and tightness of all
terminals
• HVAC DTCs (see page 21-9)
• Blown fuse No. 20 (7.5 A) in the
under-hood fuse/relay box
• Blower motor operation
• Cleanliness and tightness of all
terminals
• HVAC DTCs (see page 21-9)
• Cleanliness and tightness of all
terminals
Damaged cylinder head gasket
21-11