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Why am I nit getting a pulse to my injectors?

I have ran several test and I am getting power to the injectors as my 12V test light shows when I turn the key forward. But then the power stops instantly. When I tested it by seeing if I was getting a pulse while turning the engine over with my test light in place I can nothing. Which leads me to believe I am not getting a pulse. Thus the question why am I not getting a pulse but yet I am getting power to the injectors?

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Is this a Chrysler product?

Posted on Nov 18, 2014

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OBDII Problem related to the computer controlled system not sending a signal to the positive injection banks. Could be cam or crank sensor problem as well. These systems works on Ohm resistant's and the introduction of a 12 volt tester could compromise the system.

Posted on Nov 18, 2014

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Posted on Jan 02, 2017

blueextc3221
  • 15935 Answers

SOURCE: 2001 Chevy Malibu, 89,000 miles, 3.1 engine, won't start

CLICK HERE for the injector schematic.
CLICK HERE for the Ignition schematic.

Since the PCM uses info gatheres from the crank and cam sensors to calculate ignition - and there are no OBD codes - in all likelihood, the PCM itself is bad.

The Ignition Module, also transmits to the PCM.

It appears after all your testing - that the PCM is at fault.

It does not error report on itself (unfortunately).

The ignition timing is controlled by the Powertrain Control Module (PCM). No adjustment is necessary (distributorless ignition) or possible.

Please see the following....

The ignition timing is controlled by the Powertrain Control Module (PCM). No adjustment is necessary or possible.
The engines covered by this manual are equipped with distributorless ignitions, ignition timing is controlled by the Powertrain Control Module (PCM), as applicable. No adjustments are possible. If ignition timing is not within specification, there is a fault in the engine control system. Diagnose and repair the problem as necessary.
Ignition timing is the measurement, in degrees of crankshaft rotation, of the point at which the spark plugs fire in each of the cylinders. It is measured in degrees before or after Top Dead Center (TDC) of the compression stroke.
Ideally, the air/fuel mixture in the cylinder will be ignited by the spark plug just as the piston passes TDC of the compression stroke. If this happens, the piston will be at the beginning of the power stroke just as the compressed and ignited air/fuel mixture forces the piston down and turns the crankshaft. Because it takes a fraction of a second for the spark plug to ignite the mixture in the cylinder, the spark plug must fire a little before the piston reaches TDC. Otherwise, the mixture will not be completely ignited as the piston passes TDC and the full power of the explosion will not be used by the engine.
The timing measurement is given in degrees of crankshaft rotation before the piston reaches TDC (BTDC). If the setting for the ignition timing is 10 BTDC, each spark plug must fire 10 degrees before each piston reaches TDC. This only holds true, however, when the engine is at idle speed. The combustion process must be complete by 23° ATDC to maintain proper engine performance, fuel mileage, and low emissions.
As the engine speed increases, the pistons go faster. The spark plugs have to ignite the fuel even sooner if it is to be completely ignited when the piston reaches TDC. Spark timing changes are accomplished electronically by the engine and ignition control computers.
If the ignition is set too far advanced (BTDC), the ignition and expansion of the fuel in the cylinder will occur too soon and tend to force the piston down while it is still traveling up. This causes pre ignition or -knocking and pinging-. If the ignition spark is set too far retarded, or after TDC (ATDC), the piston will have already started on its way down when the fuel is ignited. The piston will be forced down for only a portion of its travel, resulting in poor engine performance and lack of power.
Timing marks or scales can be found on the rim of the crankshaft pulley and the timing cover. The marks on the pulley correspond to the position of the piston in the No. 1 cylinder. A stroboscopic (dynamic) timing light is hooked onto the No. 1 cylinder spark plug wire (2.2L engine only, on the 2.4L engines, special adapters are needed) . Every time the spark plug fires, the timing light flashes. By aiming the light at the timing marks while the engine is running, the exact position of the piston within the cylinder can be easily read (the flash of light makes the mark on the pulley appear to be standing still). Proper timing is indicated when the mark and scale are in specified alignment.


WARNING When checking timing with the engine running, take care not to get the timing light wires tangled in the fan blades and/or drive belts.

The engines covered by this manual are equipped with distributorless ignitions, ignition timing is controlled by the Powertrain Control Module (PCM), as applicable. No adjustments are possible. If ignition timing is not within specification, there is a fault in the engine control system. Diagnose and repair the problem as necessary.




Thanks for using FixYa!!

Posted on Aug 18, 2009

samson-1
  • 153 Answers

SOURCE: 1996 olds cutlass supreme won't crank

You can jump across the celonoid on the starter. If the engine turns over then your problem is either the celonoid or the starter switch.

Posted on Sep 28, 2008

SOURCE: 2000 F 250 WILL NOT START CRANKS OVER ONLY.

you should have the pcm scanned for dtc's... probably a bad crank or cam sensor

Posted on Oct 25, 2008

  • 19 Answers

SOURCE: 1994 Toyota Tercel Starter Problems

sounds to me that you have an igniton problem not a starter problem and or if you have or had an alarm system could be cause if u do give me feedback and i will explain but seems that your starter is fine from what u say but if you think in terms of the elemts to start a vehicle batery gives pwoer to ignition which sends to starter which gives spark etc i would check you ignition system something is causeing a short and not alowing starter to function

Posted on Feb 10, 2009

GeoffW1
  • 3961 Answers

SOURCE: 93 Toyota Camry igniter test procedures

Have a look here for comprehensive tests
http://www.turboninjas.com/camry/ig.pdf

Posted on Jan 31, 2012

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