ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-151
Troubleshooting
Step Action Yes No
1 Check each injector for operating sound at
engine cranking using sound scope.
Do all 4 injector make operating sound?
Fuel injector circuit is in
good condition.
Go to Step 2.
2 Check fuel injector resistance.
1) Disconnect connectors from fuel injectors
with ignition switch turn OFF.
2) Check for proper connection to fuel injector
at each terminals.
3) If OK, check all 4 fuel injectors for resis-
tance, referring to “Fuel Injector Inspection”
in Section 6E2.
Are all injectors in good condition?
Go to Step 3. Faulty fuel injector.
3 Check fuel injector insulation resistance.
1) Check that there is insulating between each
fuel injector terminals and engine ground.
Is there insulating?
Go to Step 4. Faulty fuel injector.
4 Check fuel injector power supply.
1) Measure voltage between each “BLK/RED”
wire terminal and engine ground with igni-
tion switch turned ON.
Is voltage 10 – 14 V?
Go to Step 5. “BLK/RED” wire in open
circuit or shorted to
ground circuit.
If it is in good condition,
go to diag flow table A-3.
5 Check wire circuit.
1) Turn OFF ignition switch.
2) Disconnect connectors from ECM.
3) Measure resistance between each “BLU/
YEL”, “BLU/WHT”, “BLU/RED”, “BLU/ORN”
wire terminal and vehicle body ground.
Is resistance infinity?
Go to Step 6. “BLU/YEL”, “BLU/WHT”,
“BLU/RED”, “BLU/ORN”
wire shorted to ground.
6 Check wire circuit.
1) Measure voltage between each “BLU/YEL”,
“BLU/WHT”, “BLU/RED”, “BLU/ORN” wire
terminal and vehicle body ground with igni-
tion switch turned ON.
Is voltage 0 V?
Go to Step 7. “BLU/YEL”, “BLU/WHT”,
“BLU/RED”, “BLU/ORN”
wire shorted to power
supply circuit.
7 Check fuel injector drive signal.
1) Connect connectors to each fuel injectors
and ECM with ignition switch turned OFF.
2) Turn ON ignition switch.
3) Measure voltage “E22-7”, “E22-6”, “E22-5”,
“E22-4” terminal and vehicle body ground.
Is voltage 10 – 14 V?
Check fuel injector, refer-
ring to “Fuel Injector
Inspection” in Section
6E2.
If result in good condition,
substitute a known-good
ECM and recheck.
“BLU/YEL”, “BLU/WHT”,
“BLU/RED”, “BLU/ORN”
open circuit.
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