FI SYSTEM 4-47
“C32” or “C33” FUEL INJECTION MALFUNCTION
INSPECTION
DETECTED CONDITION POSSIBLE CAUSE
No injector current. • Injector circuit open or short.
• Injector malfunction.
•
ECM malfunction.
• Remove the fuel tank and air cleaner box. (
:
4-52 and -60)
1
2
Ye s
Ye s
No
No
Open circuit in the Yellow/
Red wire.
Turn the ignition switch OFF.
Check the injector coupler for loose or poor contacts.
If OK, then measure the injector resistance.
Disconnect the TP sensor/injector coupler and measure
the resistance between lead wires.
Turn the ignition switch ON.
Measure the injector voltage between Y/R wire and
ground.
;
Injector voltage: Battery voltage
(Y/R – Ground)
z
09900-25008: Multi circuit tester
u
Tester knob indication: Voltage (
-
)
Replace the ECM with a new one,
and inspect it again.
;
Injector resistance: 12 – 18 Ω at 20˚C (68˚F)
;
Injector continuity: ∞Ω (Infinity)
(Y/R – Ground)
z
09900-25008: Multi circuit tester
t
Tester knob indication: Resistance (Ω)
If OK, then check the continuity between Y/R wire
and ground.
No.1 : Y/R – Gr/W
No. 2 : Y/R – Gr/B
( )
Replace the injector with
a new one. (
:
4-67)
NOTE:
Injector voltage can be detected only 3 seconds after
ignition switch is turned ON.
Gr/W, Gr/B or Y/R wire open or shorted to ground, or poor
5
,
6
or
R
connection. (
:
4-22)
If wire and connection are OK, intermittent trouble or faulty
ECM.
Recheck each terminal and wire harness for open circuit and
poor connection. (
:
4-5)
ECM coupler
Ω
Ground
Y/R
Ground
Ground
Gr/B
Gr/W
V
GroundGround
Ground
Y/R
1
2
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