6-2-58 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
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
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
1. Relay box 4. Malfunction indicator lamp in combination meter 7. ECM
2. Ignition switch 5. “IG COIL” fuse 8. Circuit fuse box
3. Main relay 6. “METER” fuse
E23-15
E21-28
12V
5V
E21-6
E21-5
BLK/WHT
BLK/RED
BLK/RED
BLK/RED
WHT/BLU
80A
60A 20A
B
BLK/YEL BLK/YEL
BLK/YEL
BLU/BLK
BLU/BLK
PPL/WHT
E21-1
BLK/RED
BLU/BLK
E22-1
E23-2
BLK
BLK/YEL
BLK/YEL
E23-1
DC
A
E23 E22 E21
12345671234561234567
7
891011121314151617 8910111213141516 891011121314151617
1819
1819
1718192021222324252627 20212223 202122232425 24252627 2627
2829303132 32 282930 28293031 3133 33 323334 3435 3435
2
1
3
8
6
5
4
7
Step Action Yes No
1 IG COIL Fuse Check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection to ECM connector at “E21-1”,
“E21-28”, “E23-15”, “E21-6”, “E21-5”, “E22-1”, “E23-1” and
“E23-2” wire terminals.
3) If OK, check “IG COIL” fuse for fuse blow.
Is “IG COIL” fuse in good condition?
Go to Step 2. Replace fuse and
check for short in
circuits connected
to this fuse.
2 Ignition Signal Check
1) Turn ignition switch to ON position.
2) Measure voltage between “E21-28” wire terminal of ECM
connector and body ground.
Is voltage 10 – 14 V?
Go to Step 3. “BLK/WHT” or
“BLU/BLK” wire
circuit open.
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