A/C Signal Circuit Troubleshooting - Honda 2002 Accord Manual

Idle Control System
A / C Signal Circuit Troubleshooting
1. Turn the ignition switch OFF.
2. Disconnect the A/C pressure switch connector.
3. Turn the ignition switch ON (II).
4. Measure voltage between ECM/PCM connector
terminals A27 and B20.
A (32P)
ECM/PCM CONNECTORS
/
2 3 4 5 6
/
8 9 10
12 13 14 15
/
17 18 19 20 21 23 24
25 26
11 28 29 30 32
A C S ( B L U / R E D )
B
(25P)
1 2 3 4 5 7 8
9 10 11 12 13 14 16 17 18
19 20 21 22 23 24 25
" f t
L G 1 ( B R N / B L K )
W i r e s i d e o f f e m a l e t e r m i n a l s
Is there approx. 5V?
Y E S - G o t o step 5.
N O - G o t o step 12.
5. Turn t h e ignition switch OFF.
6. Reconnect the A/C pressure switch connector.
7. Turn the ignition switch ON (II).
8. Momentarily connect ECM/PCM connector
terminals A17 and B20 with a jumper wire several
times.
E C M / P C M C O N N E C T O R S
/
2 3 4 5 6
/
8 9 10
12 13 14 15
/
17 18 19 20 21
23
24
25 26 27
28 29 30
32
A C C ( R E D )
B (25P)
1
2
3
4 5
/
7 8
9
10
12 13 14
/
16 17 18
19
20 21 22
23 24 25
LG1 (BRN/BLK)
JUMPER WIRE
W i r e s i d e o f f e m a l e t e r m i n a l s
is there a clicking noise from the A/C compressor
clutch?
Y E S - G o to step 9.
N O - G o t o step 15.
9. Start the engine.
10. Turn the blower switch ON.
11. Turn the A/C switch ON.
Does the A/C operate?
Y E S - T h e air conditioning signal is O K . B
N O - G o t o step 16.
12. Turn the ignition switch OFF.
13. Disconnect ECM/PCM connector A (32P)
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