Fuel Injector Solenoid
- Disconnect injector solenoid connector. Measure resistance across solenoid terminals. Resistance should be at least 1.2 ohms See Fig 1
.
- If resistance is less than 1.2 ohms, replace injector. And ensure fuse in Red/White/Black wire is not blown. Check for 12 volts on circuit A6 with ignition on See Fig 2
. Ensure fuel pressure at injector is 9-13 psi (.6-.9 kg/cm2
). See FUEL PRESSURE in BASIC TESTING
article in the ENGINE PERFORMANCE Section.
- With injector connector disconnected, crank engine. If injector sprays or drips fuel, replace injector or injector "O" ring. Connect a fuel injector test light to injector connector, and crank engine. If test light blinks, reconnect harness to injector, and crank engine.
- If fuel injector tester does not blink, check for short to ground in ECM circuit D9-D10 (peak and hold jumper). See Fig 2
. If short is present, repair circuit or replace ECM. Turn ignition on. If both terminals on fuel injector test light are off, repair open in circuit A6. If both terminals on fuel injector test light are on, repair short to voltage in circuit D16.
Courtesy of GENERAL MOTORS CORP.
Courtesy of GENERAL MOTORS CORP.