Question about 1998 Chevrolet Camaro

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Help my camaro wont crank ive tried everything from fuel pump to crankshaft sensor and coils pcm/icm i think it could be the timing how do u know its that and how do u reset it

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  • Master
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You cant reset it. So it cranks but wont start? V8? 6Cyl? You cant just guess and throw parts on it hoping you fix it. Have it towed to a shop and diagnosed.

Posted on May 12, 2010

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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

Does a 2004 chevy venture van have a coil pack?


Your Van ? Yes it does !
• Ignition control module (ICM) and ignition coils
Three dual tower ignition coils are mounted to the ICM, and are serviced individually. The ICM performs the following functions:
- The ICM receives and processes the signals from the CKP sensor B.
- The ICM determines the correct direction of the crankshaft rotation, and cuts spark and fuel delivery to prevent damage from backfiring if reverse rotation is detected.
- The ICM determines the correct coil triggering sequence, based on the 7X CKP signal. This coil sequencing occurs at start-up, and is remembered by the ICM. After the engine is running, the ICM will continue to trigger the coils in the correct sequence.
- The ICM produces and inputs 3X reference signals to the PCM.
- The ICM contains the coil driver circuits that command the coils to operate.
• Crankshaft position (CKP) sensors
The CKP sensor B is a variable reluctance sensor. The magnetic field of the sensor is altered by a crankshaft mounted reluctor wheel that has seven machined slots, six of which are equally spaced 60 degrees apart. The seventh slot is spaced 10 degrees after one of the 60 degree slots. This sensor provides the ignition control module (ICM) with 7X signals, or seven pulses for each revolution of the crankshaft. The pulse from the 10 degree slot is known as the sync pulse. Both of the sensor circuits are connected to the ignition control module (ICM). A signal converter within the ICM produces digital 3X output pulse to the powertrain control module (PCM), the 3X reference is known as the low resolution engine speed signal.
The CKP sensor A contains a hall-effect switch. A hall-effect switch is a solid state switching device that produces a digital ON/OFF pulse when a rotating element passes between the sensor tip and a magnet. This rotating element is called an interrupter ring or blade. In this case the interrupter ring has 24 evenly spaced blades and windows and is part of the crankshaft damper assembly. This sensor provides the PCM with 24X signals, or 24 identical pulses per crankshaft revolution. The 24X signal is used for enhanced smoothness and idle stability at a lower calibrated RPM. The PCM supplies the sensor with a 12-volt reference, low reference, and signal circuit.
• Camshaft position (CMP) sensor
The CMP sensor signal is a digital ON/OFF pulse, output once per revolution of the camshaft. The CMP sensor does not directly affect the operation of the ignition system. The CMP sensor information is used by the PCM to determine the position of the valve train relative to the crankshaft position. By monitoring the CMP and CKP signals the PCM can accurately time the operation of the fuel injectors. The PCM supplies the sensor with a 12-volt reference, low reference, and signal circuit.

Jun 13, 2017 | Cars & Trucks

1 Answer

94 camaro wont start...no firefrom the coil has new icm , coil , fuel pump


Check the icm plug with a led testlight for pulse while the engine is cranking. Test the wire connector with the small wires going into the coil for pulse.The v8 has a opti-spark distributor behind the waterpump that is prone to failure. It has the pickup inside it that tells the icm when to spark. If no pulse at icm distributor is bad. If pulse at icm but not at coil, icm or wiring between icm and coil is bad.The coil also needs pos.+ power on 1 terminal to operate. Be SURE to check the security light on the dash. If VATS [vehicle anti theft system] fails its usually within the 2 wires going from the key chip in the ignition tumbler to the body control module. Mine were purple and tan.Trying to start it with the wrong key can put it in lockout mode also. There are bypass modules available online for vats problems or you can even install a resistor in the wire to bypass the keychip part and the door alarms still work.

Mar 27, 2014 | 1994 Chevrolet Camaro

1 Answer

What does acam or crankshaft sensor do


  • The crankshaft position sensor identifies position of the crankshaft to the ignition control module (ICM), engine control module (ECM) or powertrain control module (PCM)
  • When not replaced, vehicle could experience no- or hard start, long crank time, misfire, lack of power, excessive hydrocarbons in oil, spark plug fouling, catalytic converter failure, poor fuel economy, CEL/MIL illumination or intermittent shutdown.
  • The camshaft position sensor identifies position of the camshaft to the ignition control module (ICM), engine control module (ECM) or powertrain control module (PCM)
  • When not replaced, vehicle could experience no- or hard start, long crank time, misfire, lack of power, excessive hydrocarbons in oil, spark plug fouling, catalytic converter failure, poor fuel economy, CEL/MIL illumination or intermittent shutdown
  • Jul 24, 2012 | Cars & Trucks

    1 Answer

    Engine stalls while driving


    That would be a symptom of a crankshaft postion sensor going bad . Shorting out when heated up . But unfortunately thier are other sensors that can cause the same problem . Plus the ICM - ignition control module could cause that problem as well . OH yea , almost forgot you vehicle has two crankshaft position sensors . You best bet , take it to a qualified repair shop that has the diagnostic tools to trouble shoot the problem .
    The electronic ignition (EI) system consists of the following components and wiring circuits:
    • The ignition control (IC) module
    • The ignition coils
    • The powertrain control module (PCM)
    • The 24X crankshaft position (CKP) sensor
    • The 7X CKP sensor
    • The camshaft position (CMP) sensor
    The EI wiring circuits listed here use the following service common names. Between the IC module and the PCM:
    • Low resolution engine speed signal
    • IC timing control
    • IC timing signal
    • Low reference
    Between the 7X CKP sensor and the IC module:
    • CKP sensor (1) signal
    • Low reference
    Between the 24X CKP sensor and the PCM:
    • Medium resolution engine speed signal
    • 12-volt reference
    • Low reference
    Between the CMP and the PCM:
    • CMP sensor signal
    • Low reference
    • 12-volt reference
    The IC module also receives power and chassis ground through the following circuits:
    • Ignition (1) voltage
    • Ground

    When it stalls check for spark , pull spark plug wires off the same coil an crank the engine . Is thier spark jumping from one coil tower to the other ? Make sure it's a lack of spark problem .

    Mar 26, 2017 | 2002 Chevrolet Venture Passanger

    1 Answer

    Hey i just helped my friend put a motor in is 99 gt, it turns over but no spark from the coils, ive tried eveything i can think of and still nothing


    what motor?

    Is the PCM power relay activating? If yes, you should hear the fuel pump hum for 5 seconds when the key is turned to ON.

    If yes, then check the crankshaft position sensor and camshaft position sensors to be sure they have output to the PCM.

    The crankshaft position sensor:
    • sends the powertrain control module a signal indicating crankshaft position.
    • is essential for calculating spark timing.
    Crankshaft Position Sensor (Integrated Ignition Systems) The crankshaft position (CKP) sensor is a magnetic transducer mounted on the engine block adjacent to a pulse wheel located on the crankshaft. By monitoring the crankshaft mounted pulse wheel, the CKP is the primary sensor for ignition information to the powertrain control module (PCM). The trigger wheel has a total of 35 teeth spaced 10 degrees apart with one empty space for a missing tooth. The 6.8L ten cylinder pulse wheel has 39 teeth spaced 9 degrees apart and one 9 degree empty space for a missing tooth. By monitoring the trigger wheel, the CKP indicates crankshaft position and speed information to the PCM. By monitoring the missing tooth, the CKP is also able to identify piston travel in order to synchronize the ignition system and provide a way of tracking the angular position of the crankshaft relative to fixed reference (Figure 23) .


    Camshaft Position Sensor The camshaft position (CMP) sensor detects the position of the camshaft. The CMP sensor identifies when piston No. 1 is on its compression stroke. A signal is then sent to the powertrain control module (PCM) and used for synchronizing the firing of sequential fuel injectors. The Coil On Plug (COP) Ignition applications also use the CMP signal to select the proper ignition coil to fire. The input circuit to the PCM is referred to as the CMP input or circuit.
    There are two types of CMP sensors: the three pin connector Hall-effect type sensor (Figure 20) and the two pin connector variable reluctance sensor (Figure 21).



    A4 CHECK VREF VOLTAGE TO THROTTLE POSITION (TP) SENSOR
    • Disconnect TP sensor.
    • Key on, engine off.
    • Measure voltage between VREF and SIG RTN circuit at the TP sensor harness connector. Refer to the schematic in Pinpoint Test DH .
    Is voltage between 4.0 and 6.0 volts? -------- A17 CHECK PCM DRIVER TO COILS
    • Connect incandescent test lamp between B+ and each coil driver circuit at the harness connector.
    • Crank engine.
    Does lamp blink consistently and brightly (one blink per engine revolution)?

    Jul 24, 2011 | 1999 Ford Mustang Cobra

    1 Answer

    1997 CAMARO TURNS OVER BUTVWONT START, REPLACED CRANK SENSOR, IGNITION MODULE, & COIL PACK. USED CODE SCANNER AND READ NO CODES. POWER TO ALL THE ABOVE ITEMS BUT NO SPARK BETWEEN SPARK PLUG WIRE AND...


    the icm, coil, and crank sensor all read off the opti. Chances are you have a bad optispark (distributor). I just went thru the same issue and found it to be the problem.

    check your fuel pressure as well, you may have anissue with your fuel pump and or relay

    Sep 21, 2010 | 1997 Chevrolet Camaro

    1 Answer

    Need to know what fires coil 1995 mercury sable both wires to coil have power when key is turned on car cranks no spark from coil new coil what gives the coil extra power to fire


    what engine? 3.0L 2 Valve? 4 Valve?
    3.4L SHO engine?

    The PCM (engine computer) fires the coils, but it is never the cause of a problem. I suspect it is the crankshaft position sensor on the front of the engine by the crank pulley. easy to change.

    Crankshaft Position Sensor The crankshaft position sensor (CKP sensor) (6C315) is a variable reluctance sensor triggered by a 36-minus-1 tooth trigger wheel located on the crankshaft pulley and damper. The signal generated from the crankshaft position sensor is called the crankshaft position (CKP) signal, which provides base timing and crankshaft speed (rpm) information to the ignition control module (ICM) (12K072). Base timing is set at 10±2 degrees before top dead center (BTDC) AND IS NOT ADJUSTABLE. The powertrain control module (PCM) (12A650) will use this information with the spark advance information to determine ignition coil (12029) turn on or turn off time.

    Sep 15, 2009 | 1995 Mercury Sable

    2 Answers

    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)
    • Mass airflow sensor (MAF sensor) (12B579)
    • Intake air temperature sensor (IAT sensor) (12A697)
    • Engine coolant temperature sensor (ECT sensor) (12A648)
    • Heated oxygen sensor (HO2S) (9F472)
    • Camshaft Position (CMP) Sensor
    • Crankshaft position sensor (CKP sensor) (6C351)
    • 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:
    • Fuel injector nozzle tip (9E527)
    • Ignition coil (12029)(s)
    • Idle air control valve (IAC valve) (9F715)
    • Ignition control module (ICM) (12A297)
    • EGR vacuum regulator control (9J459)
    • EGR external pressure valve (9F483)

    Aug 27, 2009 | 1987 Ford Aerostar

    2 Answers

    Have a 1991 buick lesabre 3800 v6, cant get to run, have had in a buick dealership replaced coil pack and icm, ran good for 2 then stopped, took back to dealership and the have been unable to find what is...


    Check the ECM if it has the number 1228253 on it, this is what is wrong with it. Gm trashed all of these bad ecms. Get a 16198264 as they do not cause a cutting off problem . Get a delco ecm , aftermarket units will give trouble and may be a rebuilt 1228253 which is junk.

    Apr 17, 2009 | 1991 Buick LeSabre

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