1A
MIL Does Not Light with Ignition Switch ON and Engine Does Not Start Though It Is Cranked Up
Wiring Diagram
1. Relay box 5. “IG” fuse 9. “IGN1” fuse
2. Ignition switch 6. “MTR” fuse 10. “FI” fuse
3. Main relay 7. ECM    
4. Malfunction indicator lamp in combination meter 8. Circuit fuse box      
Circuit Description
When the ignition switch turned ON, the main relay turns ON (the contact point closes) and the main power is supplied to ECM.
Troubleshooting
Step Action YES NO
1
IG fuse check
1) Disconnect connectors from ECM with ignition switch turned OFF.
2) Check for proper connection to ECM connector at “E118-1”, “E118-28”, “E117-15”, “E118-6”, “E118-5”, “E119-1”, “E117-1” and “E117-2” terminals.
3) If OK, check “IG” fuse for fuse blown.
Is “IG” fuse in good condition?
Go to Step 2.
Replace fuse and check for short in circuits connected to this fuse.
2
Ignition switch check
1) Turn ignition switch to ON position.
2) Measure voltage between “E118-28” terminal of ECM connector and vehicle body ground.
Is voltage 10 – 14 V?
Go to Step 3.
“BLK/WHT” or “BLK/RED” wire in open circuit.
3
Main relay circuit check
1) Turn ignition switch to OFF position.
2) Check for fuse blown at “FI” fuse (1).
3) If OK, measure voltage between “E117-15” terminal of ECM connector and vehicle body ground.
Is voltage 10 – 14 V?
Go to Step 4.
Go to Step 8.
4
Main relay circuit check
1) Remove ECM from vehicle body and connect connectors to ECM.
2) Turn ignition switch to ON position.
3) Measure voltage between “E117-15” terminal of ECM connector and vehicle body ground.
Is voltage 0 – 1 V?
Go to Step 6.
Go to Step 5.
5
ECM ground circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from ECM.
3) Measure resistance between each “E119-1”, “E117-1” and “E117-2” terminals of ECM connector and vehicle body ground.
Is resistance 1 Ω or less?
Substitute a known-good ECM and recheck.
“BLK” wire in open circuit or high resistance circuit.
6
Main relay circuit check
1) Disconnect connectors from ECM with ignition switch turned OFF.
2) Using service wire, ground “E117-15” terminal of ECM connector and measure voltage between each “E118-5” and “E118-6” terminals of ECM connector and vehicle body ground.
Is voltage 10 – 14 V?
Substitute a known-good ECM and recheck.
Go to Step 7.
7
Main relay circuit check
1) Remove main relay (2) from relay box.
2) Check for proper connection to main relay connector at “BLU/RED” and “BLU/BLK” wire terminals.
3) If OK, measure resistance between each “E118-5” and “E118-6” terminals of ECM connector and “BLU/BLK” wire terminal of main relay connector.
Is resistance 1 Ω or less?
Go to Step 8.
“BLU/BLK” wire in open circuit or high resistance circuit.
8
Main relay circuit check
1) Remove main relay from relay box.
2) Measure voltage between “BLU/RED” wire terminals of main relay connector and vehicle body ground.
Is voltage 10 – 14 V?
Go to Step 9.
“BLU/RED” wire in open circuit.
9
Main relay check
1) Check main relay referring to Main Relay, Fuel Pump Relay, A/C Compressor Relay and A/C Condenser Fan Control Relay Inspection:M13A .
Is main relay in good condition?
“BLU” wire in open circuit or high resistance circuit.
Replace main relay.