17-70 SELF-DIAGNOSIS SYSTEM
Primary Fuel Injectors (Service Code 41, 42, 43, 44)
Primary Fuel Injector Removal/Installation
Refer to the Throttle Body Assy Disassembly/Assembly
in the Fuel System (DFI) chapter.
Primary Fuel Injector Audible Inspection
Be sure the battery is fully charged.
Start the engine, and let it idle.
Apply the flat tip screwdriver [A] to the primary fuel injector
[B]. Put the grip end onto your ear, and listen whether the
primary fuel injector is clicking or not.
A sound scope can also be used.
The click interval becomes shorter as the engine speed
Do the same for the other primary fuel injectors.
If all the primary fuel injectors click at a regular intervals,
the fuel injectors are normal.
Turn the ignition switch off.
If any primary fuel injector does not click, check the pri-
mary fuel injector resistance (see Primary Fuel Injector
Primary Fuel Injector Resistance Inspection
Air Intake Chamber (see Air Intake Chamber Removal
in the Fuel System (DFI) chapter)
Primary Fuel Injector Connector [A]
Connect a digital meter to the terminals in each primary
fuel injector [A].
If necessary, use the measuring adapter.
Special Tool - Measuring Adapter: 57001-1700
Measure the primary fuel injector resistance.
Primary Fuel Injector Resistance
About 11.7 ∼ 12.3 Ω @20°C (68°F)
If the reading is out of the standard, replace the primary
If the reading is within the standard, check the power
source voltage (see Primary Fuel Injector Power Source