Service manual

FUEL SYSTEM (DFI) 3-69
Fuel Injectors
Injector Signal Test
•
Prepare two test light sets with terminals as shown.
Rating of Bulb [A]: 12 V × (3 ∼ 3.4) W
Terminal Width [B]: 1.8 mm (0.071 in.)
Terminal Thickness [C]: 0.8 mm (0.031 in.)
CAUTION
Do not use larger terminals than specified above.
A larger terminal could damage the injector main
harness connector, leading to harness repair or re-
placement.
Be sure to connect bulbs in series. The bulb works
as a current limiter to protect the solenoid in the
injector from excessive current.
•
Remove:
Fuel Injector (see Fuel Injector Removal)
•
Connect each test light set [A] to the injector harness c on-
nector [B].
•
Turn the ignition switch ON.
•
While cranking the engine with the starter motor, watch
the test lights.
If the test lights flicker at regular intervals, the injector
circuit in the ECU, and the wiring are good. Perform the
“Injector Resistance Inspection”.
○
Injector signals can be also confirmed by connecting the
hand tester (× AC 10 V ) instead of the test light set to the
injector main harness connector. Crank the engine with
the starter motor, and check to see if the hand oscillates
at regular intervals.
Special Tool - Hand Tester: 57001-1394
If the test light doesn’t flicker (or the tester needle doesn’t
oscillates), check the wiring and connectors again.
If the wiring is good, replace the ECU (see ECU Re-
moval/Installation).
Injector Resistance Inspection
•
Remove:
Fuel Injector (see Fuel Injector Removal)
•
Measure the injector resistance with the hand tester [A].
Special Tool - Hand Tester: 57001-1394
Injector Resistance
Connections to Injector Connector
Standard: About 11.7 ∼ 12.3 Ω a t 20°C (68°F)
If the reading is out of the range, perform the “Injector Unit
Test ”.
If the reading is normal, perform the “Injector Unit Test”
for confirmation.