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6-60 ENGINE GENERAL INFORMATION AND DIAGNOSIS
Table A-3 ECM Power and Ground Circuit Check-MIL Doesn't Light with Igni-
tion Switch ON and Engine Doesn't Start Though It Is Cranked Up
WIRING DIAGRAM
2
WHT/BLU
BLK/YEL
1
80A
60A 15A
C64
7
6
5
4
17
16
15
14
13
12
27
26
25
24
23
22
34
33
32
1. Relay/fuse box
2. Ignition switch
3. Main relay
CIRCUIT DESCRIPTION
When the ignition switch tuned ON, the main relay turns ON (the contact point closes) and the main power is
supplied to ECM.
TROUBLESHOOTING
Step
1
IG Fuse Check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection to ECM connector at "G91-1",
"G91-28", "C64-15", "G91-6", "G91-5", "C63-1", "C64-1"
and "C64-2" wire terminals.
3) If OK, check "IG" fuse for fuse blow.
Is "IG" fuse in good condition?
2
Ignition Signal Check
1) Turn ignition switch to ON position.
2) Measure voltage between "G91-28" wire terminal of ECM
connector and body ground.
Is voltage 10 – 14 V?
6
8
BLK/YEL
BLU/ORN
BLK/YEL
5
3
BLK/YEL
D
C
B
A
BLK/YEL
C63
3
2
1
7
6
5
4
3
11
10
9
8
19
18
17
16
15
14
13
12
21
20
19
18
27
26
25
24
31
30
29
28
35
34
33
32
4. Malfunction indicator lamp in combination meter
5. "IG" fuse
6. "METER" fuse
Action
4
PPL/WHT
G91-1
BLK/WHT
G91-28
BRN/WHT
C64-15
BLK/RED
BLK/RED
G91-6
BLK/RED
G91-5
G91
2
1
6
5
4
3
11
10
9
8
16
15
14
13
12
11
10
9
23
22
21
20
27
26
25
24
23
22
21
20
31
30
29
28
35
34
33
32
31
7. ECM
8. Circuit fuse box
7
C63-1
C64-2
C64-1
5V
12V
2
1
7
8
19
18
17
30
29
28
Yes
Go to Step 2.
Replace fuse and
check for short in
circuits connected
to this fuse.
Go to Step 3.
"BLK/WHT" or
"BLK/YEL" wire
circuit open.
BLK/ORN
BLK
BLK/ORN
No
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