Question about 2003 Oldsmobile Alero

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Injectors have no electric

I have no power to the injectors on my 03 olds alero. i have checked all the fuses, and replaced the crankshaft sensor. the engine will start if i put some gas into the throtle body. the injectors have the right resistance. i used the niod light and have no power.

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First thing to do is use a test light at the injectors, check to see if you have constant power on 1 side when key is on, you should, if so the computer is not sending a ground to the injectors, or a possible broken wire or bad connection somewhere

Posted on May 17, 2009


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I have fuel pressure but the engine wont start unless i spray starting fluid into the intake. the injectors arent working? could it be the pcm is bad?

Not likely. I believe the injectors have 12 volts going to them all the time. The PCM then grounds them so they operate when the crankshaft or camshaft sensor tell the PCM when the cylinder is on compression stroke.

I would check for an injector fuse first (see owner manual), and then check to see if you have a bad crank or camshaft sensor.

The PCM very rarely fails.

Section 03-14: Engine Controls, Electronic 1994 All Aerostar, Ranger, and Explorer Vehicles Workshop Manual
DESCRIPTION AND OPERATION Powertrain Control Module (PCM) The center of the EEC-IV system is a microprocessor called the powertrain control module . It receives data from various sensors:
  • Throttle position sensor (TP sensor) (9B989)
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  • Engine coolant temperature sensor (ECT sensor) (12A648)
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  • Power Steering Pressure (PSP) Switch
The powertrain control module contains specific calibrations for optimizing emissions controls, fuel economy, and driveability. Based on information received and programmed into its memory, the processor sends signals to control various actuators:
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Welcome to fixya. If you need anything else go to here is the location.
On the lower rear of the engine (LA1) for the 7x
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