4-58 FI SYSTEM DIAGNOSIS
4) Check for proper terminal connection to the injector coupler.
5) If connections are OK, turn the ignition switch ON.
6) Measure the voltage between O/Bl wire and ground.
NOTE:
Voltage can be detected only for 3 seconds after ignition switch
is turned ON.
09900-25008: Multi circuit tester set
Tester knob indication: Voltage (
)
Injector power supply voltage:
Battery voltage
(
+
terminal: O/Bl –
-
terminal: Ground)
Is check result OK?
Step 2
Injector drive circuit check
1) Turn the ignition switch OFF.
2) Disconnect the ECM couplers
1
.
3) Check for proper terminal connection to the ECM couplers.
4) If connections are OK, check the following points.
• Resistance
09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set
Tester knob indication: Resistance (
)
– Between Bl/Y (#1) or Bl/G (#2) wire of injector coupler and
ECM coupler: less than 1
– Between Bl/Y (#1) wire or Bl/G (#2) wire and ground: infin-
ity
YES
Go to Step 2.
NO
Repair or replace the O/Bl wire.
1
2
2
(#2)
(#2)
(#1)
(#1)
2
