Question about 1998 Chevrolet Malibu

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Will not fire i changed the coils and icm what could it be

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Crankshaft position sensor could also prevent correct firing.

Posted on Mar 27, 2011

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Posted on Jan 02, 2017

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Where is camshaft position sensor on 2002 Pontiac grand am se ecotec 2.2


This vehicle does not have a cam sensor .The ICM provides a synthesized cam signal to the PCM based on these inputs. The PCM uses the cam signal to synchronize fuel injection.

The powertrain control module (PCM) supplies a signal on each of the ignition control (IC) timing control circuits to the ignition control module (ICM). The ICM fires the correct ignition coil at the correct time based on the signals. The ICM detects if cylinder 1 or cylinder 3 is on the compression stroke by sensing the secondary voltage and polarity of each side of the ignition coil. The ICM detects this voltage with sensing circuitry integrated into each ignition coil. The higher voltage is on the compressing cylinder. This is called compression sense ignition. The ICM provides a synthesized cam signal to the PCM based on these inputs. The PCM uses the cam signal to synchronize fuel injection.
This system consists of the following circuits:
• An ignition voltage circuit
• A ground circuit
• A camshaft position (CMP) sensor signal circuit
• An IC timing control circuit for cylinders #1 and #4
• An IC timing control B circuit for cylinders #2 and #3

DTC P0340
This ignition system does not use a conventional camshaft position (CMP) sensor that detects valve train position. The ignition controls module (ICM) detects when #1 or #3 cylinder has fired on the cylinders compression stroke using sensing circuitry integrated within each coil. The sensing circuit detects the polarity and the strength of the secondary voltage output, the higher output is always at the event cylinder. The ignition control module (ICM) sends a CMP signal to the powertrain control module (PCM) based on the voltage difference between the event and waste cylinder firing energy. This system is called compression sense ignition. By monitoring the CMP and crankshaft position (CKP) signals, the PCM can accurately time the operation of the fuel injectors. If the PCM receives an intermittent CMP signal from the ICM, the CMP Resync Counter on the scan tool will increment. When the PCM cannot use the information from the CMP signal, a DTC will set. DTC P0341 sets when the PCM detects too many CMP Resyncs within a certain amount of time.

Jul 13, 2017 | Pontiac Cars & Trucks

1 Answer

Have fire to coil pack, but no fire coming from it


It sounds like a bad ground. The coils are grounded through the Ignition Control Module and yours may be defective. The replacement of an ICM takes about fifteen minutes and you can do-it-yourself.

Jun 10, 2012 | 2001 Chevrolet Malibu

1 Answer

Where is the location and what is the appearance of the spout connector on 1993 3.0 ranger xlt ..it appears that mine is missing..would this cause engine knocking under acceleration in a high gear ??


The SPOUT connector, if disconnected, would prevent the spark from advancing. So, you would have less spark knock if disconnected. You only disconnect it when you are running a test for codes.
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Disconnect the single wire in-line SPOUT connector or remove the shorting bar from the double wire SPOUT connector. (In engine comartment)
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The internal circuitry of the ICM will have one of two possible arrangements, push start or computer controlled dwell (CCD). The push start system allows for increased dwell, or coil ON time, when starting the engine. The ICM on this system determines when to turn the coil ON based upon engine rpm information. The coil is then fired, or turned OFF, whenever a rising edge of a SPOUT signal is encountered (Figure 5 ). The SPOUT signal, short for SPark OUTput, is a digital signal generated by the PCM providing spark angle information to the ICM. The SPOUT signal on the push start system controls only the firing of the coil. The falling edge of the SPOUT signal is ignored. The CCD system, however, does use both edges of the SPOUT signal (Figure 6 ). The SPOUT signal for the CCD system is same as in the push start except that the falling edge is now generated to control the time at which the coil is turned ON. The coil ON time, or dwell, for this system is thus entirely controlled by the SPOUT signal. The ICM does not internally determine when to turn the coil ON as it does on the push start system. It responds directly to the SPOUT signal it receives.
In the case that the SPOUT signal line opens from the PCM, the ICM will use the PIP signal to fire the coil. This results in a fixed spark angle of and fixed dwell.
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Oct 28, 2010 | 1993 Ford Ranger SuperCab

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