Engine General Information and Diagnosis: 1A-31
Self-Diagnostic Code “4 – 3” Fuel Injector
Z9J0111104011
Wiring Diagram
Troubleshooting
For step 3
1. Fuel injector
12 V (From main relay)
C
P
U
ECM
#1
O/B
B/Br
R/W
Lg
#2
#3
#4
1
I9J011110040-04
Step Action Yes No
1 1) Using a sound scope, check that each injector has an
operating sound when the engine is cranking.
Do all injectors make an operating sound?
Fuel injector and its
circuit are in good
condition.
Go to step 2.
2 1) Check the fuel injector, the wiring connection and the
wire harness of the fuel injector not making the operating
sound.
Are all of the above OK?
Substitute a known-
good ECM and recheck.
Faulty injector or its
circuit.
3 1) With the ignition switch “OFF”, disconnect the connector
from the fuel injector.
2) Check the voltage at “Gr” wire terminal with the ignition
switch “ON”.
Is the voltage 12 V (battery voltage)?
Go to step 4. Power circuit open.
4 1) Disconnect the ECM connector with the ignition switch
“OFF”, and check all of the injectors for resistance.
Refer to “Resistance Check” in Section 1C (Page 1C-7).
Is the resistance 10 – 14
Ω
for each injector?
Substitute a known-
good ECM and recheck.
Faulty injector or its
circuit.
Gr
I9J011110023-02
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