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14. Check for continuity between body ground and
ECM/PCM connector terminal A27.
E C M / P C M C O N N E C T O R A (32P)
/
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 S ( B L U / R E D )
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
continuity?
YES™Repair short in the wire between the E C M /
PCM (A27) and the A/C pressure switch. •
N O - S u b s t i t u t e a known-good ECM/PCM and
recheck (see page 11-5). If the prescribed voltage is
now available, replace the original ECM/PCM. If not,
check the A/C system for other symptoms. •
15. Momentarily connect under-hood fuse/relay box 16
P connector terminal No. 11 to body ground with a
jumper wire several times.
NOTE: The under-hood fuse/relay box 16P
connector is on the bottom of the fuse box. When
you unbolt and invert the fuse box, leave the upper
cover on to prevent short circuits.
U N D E R - H O O D F U S E / R E L A Y B O X
C O N N E C T O R D ( 1 6 P )
A C C ( R E D )
1
3
4
7
8
1 1
12
14
16
J U M P E R W I R E
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?
YES—Repair open in the wire between the E C M /
PCM (A17) and the A/C clutch relay. •
NO—Check the A/C system for other symptoms. •
16. Measure voltage between ECM/PCM connector
terminals A27 and B20.
/
2
3
4
5
6
/
8
9
10
1 2 13 14 15
/
1 7
18
19 2 0 21
2 3
2 4
2 5 2 6 2 7
2 8 2 9 3 0
3 2
A C S ( B L U / R E D )
B (25P)
1
2
3
4
5
7
8
9
10
11 12 1 3 14
16 1 7 18
19
20
21 2 2
2 3 2 4 2 5
LG1 ( B R N / R L K )
2 >
W i r e s i d e of f e m a l e t e r m i n a l s
Is there less than 1.0 V?
Y E S - S u b s t i t u t e a known-good ECM/PCM and
recheck (see page 11-5). If the symptom/indication
goes away, replace the original ECM/PCM. If not,
inspect the air conditioning system. •
NO —Repair open in the wire between the E C M /
PCM (A27) and the A/C pressure switch. •
11-105
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Table of Contents
Troubleshooting
