FI SYSTEM DIAGNOSIS 12-55
5) If OK, then check the continuity between each terminal and
ground.
Injector resistance:
∞
Ω
(Infinity)
(Terminal – Ground)
09900-25008: Multi circuit tester set
Tester knob indication: Resistance (
Ω
)
Are the resistance and continuity OK?
Step 2
1) Connect a 12 volt battery to the service coupler using the bat-
tery lead wire. (
12-19)
2) Insert the needle-point probe to the lead wire coupler.
3) Measure the injector voltage between B/R wire and ground.
Injector voltage: Battery voltage
(
+
B/R –
-
Ground)
09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set
36890-28H00: Battery lead wire (option)
Tester knob indication: Voltage (
)
Is the voltage OK?
YES
Go to Step 2.
NO
Replace the injector with a new one. (
13-16)
YES
• Gr/W wire open or shorted to ground, or poor
F
connection.
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
NO
Short circuit in the B/R wire.
1
2
V
ECM coupler (Harness side)
2
