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6-56 ENGINE GENERAL INFORMATION AND DIAGNOSIS
Table A-1 Malfunction Indicator Lamp Circuit Check – Lamp Does Not Come
"ON" with Ignition Switch ON (But Engine Stops)
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 is turned ON, ECM causes the main relay to turn ON (close the contact point). Then,
ECM being supplied with the main power, turns ON the malfunction indicator lamp (MIL). When the engine
starts to run and no malfunction is detected in the system, MIL goes OFF but if a malfunction was or is detected,
MIL remains ON even when the engine is running.
TROUBLESHOOTING
Step
1
MIL Power Supply Check
1) Turn ignition switch to ON position.
Do other warning lights come ON?
2
METER Fuse Check
1) Turn ignition switch to OFF position.
2) Check for fuse blow at "METER" fuse.
Is "METER" fuse in good condition?
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
Yes
Go to Step 4.
Go to Step 3.
7
C63-1
C64-2
C64-1
5V
12V
2
1
7
8
19
18
17
30
29
28
Go to Step 2.
Replace "METER" fuse and
check for short.
BLK/ORN
BLK
BLK/ORN
No
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