A/C Signal Circuit Troubleshooting - Honda Accord 2008 Manual

07/11/02 09:17:08 61TA0000_110_0336
Idle Control System

A/C Signal Circuit Troubleshooting

1. Start the engine, and let it idle.
2. Turn the blower switch on.
3. Turn the A/C switch on.
4. Check the A/C CLUTCH in the DATA LIST with the
HDS.
Does it indicate ON?
YES − Go to step 5.
NO − Do the A/C system test (see page 21-77).
5. Check the A/C system.
Does the A/ C system operate?
YES − The air conditioning system circuit is OK.
−
NO Go to step 6.
6. Turn the ignition switch to LOCK (0).
7. Turn the ignition switch to ON (II).
8. Activate the A/C CLUTCH in the INSPECTION
MENU with the HDS.
Is there a clicking noise f rom the A/ C compressor
clutch?
−
YES Do the A/C system test (see page 21-77).
NO − Go to step 9.
9. Turn the ignition switch to LOCK (0).
10. Jump the SCS line with the HDS.
11. Disconnect ECM/PCM connector A (49P).
12. Turn the ignition switch to ON (II).
11-336
13. Momentarily connect ECM/PCM connector terminal
A15 to body ground with a jumper wire several
times.
ECM/PCM CONNECTOR A (49P)
ACC (PUR)
JUMPER WIRE
Terminal side of female terminals
Is there a clicking noise f rom the A/ C compressor
clutch?
−
YES Update the ECM/PCM if it does not have the
latest software (see page 11-231), or substitute a
known-good ECM/PCM (see page 11-7), then
recheck. If the symptom/indication goes away with
a known-good ECM/PCM, replace the original ECM/
PCM (see page 11-232).
NO − Check for poor connections or loose terminals
at the A/C compressor clutch relay and the ECM/
PCM. If the connections are OK, check the A/C
compressor clutch relay (see page 22-91). Then
repair open in the wire between the ECM/PCM
(A15) and the A/C compressor clutch relay and the
other A/C systems.
ＴＡ０８ＡＥ４Ａ２０３３６１１２１０１ＦＡＡＴ００
＊０１