Question about 1994 Pontiac Trans Sport

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ECM Electronic Control Module

Where is the ECM for 94 Transport 3.1?

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  • Bad Apple May 17, 2009

    Found Module

  • Bad Apple May 22, 2009

    Yes it does have a distributor and the module is under the rotor.

    Thanks for your help!!

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  • 193 Answers

Passenger side under dash. behind glove box

Posted on Jul 21, 2009

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2009 chevy hhr speakers don't work and a/c radiator fan won't come on


What engine does it have ?

Cooling Fan Control 2.0L
The engine cooling fan is a variable speed fan. The engine control module (ECM) controls the fan speed by sending a pulse width modulated (PWM) signal to the cooling fan control module. The cooling fan control module varies the voltage drop across the engine cooling fan motor in relation to the PWM signal. The cooling fan speed can be adjusted from 10 percent to 94 percent duty cycle. 94 percent is considered high speed fan.
Cooling Fan Control 2.2L or 2.4L
The engine cooling fan system consists of one cooling fan and one relay. Voltage is supplied to the relay through a fuse. The engine control module (ECM) controls the fan operation by grounding the cool fan relay control circuit. When the cool fan relay is energized, voltage is delivered to the cooling fan motor. The cooling fan motor is grounded through its own ground circuit.
When the request for fan activation is withdrawn, the fan may not turn OFF until the ignition switch is moved to the OFF position or the vehicle speed exceeds approximately 10 mph. This is to prevent the fan from cycling ON and OFF excessively at idle.


Just one speaker doesn't work ? Do you know how to do automotive electrical testing ? That's how to find both your problems . Speakes work by electrical inpluse's . The A/C radiator ( condenser ) fan also works by B+ voltage through a fuse an a relay , controlled by the engine electronic control module or PCM - powertrain control module . When you push the A/C turn on button , it sends a signal to the PCM . The PCM will then energize the radiator fan relay turning on the fan . Check fuse in the under hood fuse box , If the fuse is blown you have a electrical short , too much current flow . Plus if the PCM sees too much pressure in the A/C system it will not let the A/C work .

Mar 31, 2017 | Cars & Trucks

2 Answers

P1296 code 1996 Concorde


P1296 CHRYSLER - 5 Volt Reference Voltage Missing At Throttle Position Sensor
https://www.autocodes.com/p1296_chrysler.html

Mar 02, 2017 | 1996 Chrysler Concorde

1 Answer

Hi i am still getting problems with this 2008 chavy tahoe, affter changeing the fuel pump, it drive a little and cutting off ,two codes comeing up p025A and P0452 .and the nigative wire getting hot.


DTC P025A: Fuel Pump Control Module Enable Circuit
Your problem is the fuel pump control module , do you know what this is !
Circuit/System Description
The engine control module (ECM) supplies voltage to the fuel pump flow control module (FPCM) when the ECM detects that the ignition is on. The voltage from the ECM to the FPCM remains active for 2 seconds, unless the engine is in crank or run. While this voltage is being received, the FPCM supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel rail pressure.
Electronic Returnless Fuel System (ERFS) - LMF
The electronic returnless fuel system is a microprocessor controlled fuel delivery system which transports fuel from the tank to the fuel rails. It functions as an electronic replacement for a traditional, mechanical fuel pressure regulator. A pressure vent valve within the fuel tank provides an added measure of fuel pump flow control module (FPCM). Desired fuel pressure is commanded by the engine control module (ECM), and transmitted to the FPCM via a GMLAN serial data message. A liquid fuel pressure sensor provides the feedback the FPCM requires for Closed Loop fuel pressure control.
Fuel Pump Flow Control Module (except LY6)
Mounted to the left side of the frame assembly below the driver seat
DTC P0452: Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage


What negative wire gets hot ?
What
your pro

Sep 22, 2015 | Cars & Trucks

1 Answer

What is an ECM


Electronic Control Module, the engine management computer in plain English, the brain box in slang; some car makers call theirs an ECU (Electronic Control Unit), or a PCM (Program Control Module, or Powertrain Control Module), or ECM (Electronic Control Module). May even be other names for them. The engine computer uses several sensors (as inputs) to compute fuel requirements and spark timing (ignition timing) needed for the operating conditions at that moment, then it sends signals to controllers and switches (outputs) to run the engine at optimum efficiency.

May 23, 2013 | 2002 Mini Cooper

1 Answer

What is code B2799


This Diagnostic Trouble Code (DTC) is output when the Engine Control Module (ECM) detects errors in communication between the Transponder Key Electronic Control Unit (ECU) assembly and the ECM, or in the communication lines. This DTC is also output when an engine start is attempted while the ECU communication ID between the transponder key ECU assembly and the ECM is different.
Possible causes Faulty Key Faulty transponder key amplifier Faulty Transponder Key Electronic Control Unit (ECU) Transponder key amplifier wire harness Faulty Engine Control Module (ECM)

Mar 02, 2013 | 2007 Lexus ES 350

1 Answer

Were is the ecm located?


  • REMOVAL & INSTALLATION
  • Print


    OPERATION

    When the term Electronic Control Module (ECM) is used in this guide it will refer to the engine control computer regardless that it may be a Vehicle Control Module (VCM), Powertrain Control Module (PCM) or Engine Control Module (ECM).
    The Electronic Control Module (ECM) is required to maintain the exhaust emissions at acceptable levels. The module is a small, solid state computer which receives signals from many sources and sensors; it uses these data to make judgments about operating conditions and then control output signals to the fuel and emission systems to match the current requirements.
    Engines coupled to electronically controlled transmissions employ a Powertrain Control Module (PCM) or Vehicle Control Module (VCM) to oversee both engine and transmission operation. The integrated functions of engine and transmission control allow accurate gear selection and improved fuel economy.
    In the event of an ECM failure, the system will default to a pre-programmed set of values. These are compromise values which allow the engine to operate, although at a reduced efficiency. This is variously known as the default, limp-in or back-up mode. Driveability is almost always affected when the ECM enters this mode.


    REMOVAL & INSTALLATION

    See Figures 1 and 2


    0900c152800a7f96.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Fig. 1: ECM mounting scheme-except 1996 models


    0900c152800a7f97.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Fig. 2: ECM mounting scheme-1996 models
    The ECM is located in the passenger side footwell in the kick panel up to 1996. In 1996, the ECM is located in the engine compartment next to the battery.

    1. Disconnect the negative battery cable.
    2. Disengage the connectors from the ECM.
    3. Remove the spring retainer off and over the rail of the ECM on vehicles except 1996.
    4. Slide the ECM out of the bracket at an angle.
    5. Remove the ECM.

    To install:
    1. Install the ECM into the bracket.
    2. Install the spring retainer (except 1996) and plug in the electrical connectors.
    3. Connect the negative battery cable.

    Jun 30, 2012 | 1993 GMC Safari

    1 Answer

    Trac off light came on and off then stayed on while driving, p0203p0204 p0300 codes when scanned with little machine better read open circuts in both injectors loss of power


    P0203 - Injector Circuit Malfunction Cylinder 3

    Powertrain Control Module (PCM) or Electronic Control Module (ECM) checks the injectors circuit resistance and monitors the voltage drop during normal operation. The PCM/ECM will trigger the P0203 code when the resistance or voltage drop at the injector #3 is out of specifications.

    Causes:
    - Open or shorted wiring harness to the injector #3
    - Bad injector #3
    - Bad PCM/ECM

    Solutions:
    - If damage, repair injector wire harness or connector
    - Replace injector
    - Replace PCM or ECM


    P0204 - Injector Circuit Malfunction Cylinder 4

    Same info as the P0203 DTC


    P0300 - Random/Multiple Cylinder Misfire Detected

    When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crankshaft position (CKP) sensor (POS) signal to vary, Powertrain Control Module (PCM) or Electronic Control Module (ECM) can determine that a misfire is occurring.

    Causes:
    - Improper spark plug
    - Insufficient compression
    - Incorrect fuel pressure
    - The injector circuit is open or shorted
    - Fuel injectors may be faulty
    - Intake air leak
    - The ignition signal circuit is open or shorted

    Solutions:
    - Perform Injector Service
    - Replace Spark Plugs
    - Replace Injectors
    - Replace Ignition Coils

    Feb 03, 2011 | 2001 Pontiac Sunfire

    1 Answer

    I have a 1992 gmc sonoma 2 wd 4.3L throtle body i am getting the service engine soon light and I checked the codes and I get number 42- Electronic spark timing bypass circuit or EST circuit is grounded...


    CODE 42 Trouble Code 42 indicates that there may be a malfunction in the Electronic Spark Timing (EST) system.
    During cranking, the timing is controlled by the ignition module while the ECM monitors the engine speed. When the engine speed exceeds 400 RPM, the ECM sends a BYPASS signal to the ignition module which switches the timing to ECM control. The ECM calculates what the timing should be then "tells" the ignition module via the EST circuit.
    An open or ground in the EST circuit will stall the engine and set a Code 42. The engine can be re-started but it will run on ignition module timing.
    The conditions for setting this code are:
    • System in BYPASS mode but the ignition module is still controlling timing
      - or -
    • Engine speed > 600 RPM with no EST pulses (ECM controlled timing) going to the ignition module for 200 msec.


    Typical causes for this code include:
    1) BYPASS line is open or grounded
    2) EST line is open or grounded
    3) PROM or CALPACK not seated properly in the ECM
    4) Poor connections between ignition module and ECM
    5) Poor routing of EST harness and/or poor quality ignition wires (EMI induced electrical noise)
    6) Faulty or incorrect ignition module
    7) Faulty ECM


    Thank you for using fixya and keep us posted

    Oct 10, 2010 | 1992 GMC Sonoma

    1 Answer

    I have no injector pusle on a 1997 chevy blazer ,my question is does it get its injector pulse from the control module?


    The ECM or electronic control module does fire the injectors, however, the injector pulse that the control module uses to fire the injectors is generated from the igniton module inside of the distributor and then the injector pulse is processed through the control module.

    Most likely the ignition module that is inside of the distributor is faulty, or there is a damaged or grounded wire between the control module and the control unit. If there is no problem to be found with the ignition module inside of the distributor or with the wiring between the control module and the ignition module inside of the distributor, then the problem will be with the electronic control module itself. Also, check all of the fuses to the ECM.

    Let me know if you require any further assistance.

    Aug 07, 2010 | Chevrolet Blazer Cars & Trucks

    3 Answers

    What does ecm stand for


    Electronic Control Mogul [ECM].........Help This was what You were looking for if we can be of any further assistance please let us know , Thank You.

    Mar 24, 2010 | 2000 Chevrolet Silverado

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