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What is a PCM - 1996 Chevrolet Impala SS

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  • Chevrolet Master
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Powertrain control module. It does exactly what it implies, controls the engine and transmission. Some Manufacturers have a split system which starts the vehicle and then transfers the operations to a different computer after a fixed number of seconds.

Using a split system usually shows up when the engine starts and runs perfectly for 5 to 10 seconds and then dies. The transfer to the second computer is not occuring when they do this.

Posted on Feb 18, 2012

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1 Answer

Where the ecm/pcm located on a chevy avalanche 2002


The pcm is just under the battery on the left side of the engine compartment. The PCM need to be calibrated to the truck and motor. If you just put it in the motor may not start. Read over the information I have attached before you do this. Ken Powertrain Control Module Replacement Service of the powertrain control module (PCM) should consist of either replacement of the PCM or electrically erasable programmable read only memory (EEPROM) programming. If diagnostic procedures call for the PCM to be replaced, the replacement PCM should be checked to ensure that the correct part is being used. If the correct part is being used, remove the faulty PCM and install the new service PCM.
Important: To prevent internal PCM damage, the ignition must be OFF when disconnecting or reconnecting power to the PCM. For example, when working with a battery cable, PCM pigtail, PCM fuse, or jumper cables. • Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM module connector gaskets when diagnosing or replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the PCM. • The replacement PCM must be programmed.

Removal Procedure

    Important: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100%. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5000 km (3,000 mi) from the last engine oil change.
  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.

Nov 30, 2016 | Cars & Trucks

1 Answer

I have a 2001 Lincoln LS and the Ford dealership is telling me that they can't update my PCM because my mega fuse is blown do a mega fuse have anything to do with the memory


Really depends on which fuse is out. If the PCM has no power it can not be reprogrammed. The issue is what made the fuse break and why does the Dealership think the PCM needs reprogramming? You do not know if the PCM will work until it is powered up unless certain connection points are tested and it shows the PCM is dead. This would be like saying the insides of your PCM are burnt up. If the PCM is burnt up restoring power will not fix it.

Probably a better way to to say it is you need to know if the PCM was burned up and if that is why the fuse broke. The fuse is suppose to protect the PCM before it is damaged. You could smoke another PCM if you connect it up to the car without repairing the problem first.. But the PCM is a computer and the memory can be lost. But like other computers there are Read only programming and programs which can be rewritten. If the circuits are good then the old PCM can be reprogrammed when power is restored.

Oct 19, 2015 | Ford Cars & Trucks

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I got a 2000 gmc Jimmy no start, no spark and diagnostic computer says no link or communication from pcm. Any ideas? I did check all the fuses and the wiring to the distributor, crank sensor, ignition...


If vehicle has been submerged, PCM is likely dead. If vehicle has been struck by lightning, PCM could be locked up or dead. Assuming none of these has happened:
Check power to PCM, not just fuses. You can check through the backside of the connectors ON the PCM.
Check connectors on PCM.
Check ground to PCM.
Make sure you've had no rodent activity on vehicle wiring.
Reset PCM by disconnecting battery (+) lead, waiting 15 seconds, then grounding battery (+) to battery (-) lead. Reconnect battery (+) lead to battery. All user memory sets such as radio and seat settings will be lost.
With no output from PCM, after resetting, the highest probability is dead PCM. It's rare, but it happens.

Nov 10, 2014 | 2000 GMC Jimmy

1 Answer

What dose it mean when engin light falshes contstantly


Flashing Diag Code P0122
TP circuit low input
DETECTION CONDITION
• If PCM detects TP sensor voltage at PCM terminal 89 below 0.10 V after engine start, PCM determines
that TP circuit has a malfunction.
POSSIBLE CAUSE
• TP sensor malfunction
• Connector or terminal malfunction
• Open circuit between TP sensor terminal C and PCM terminal 89
• Short to ground circuit between TP sensor terminal C and PCM terminal 89
• Open circuit between TP sensor terminal A and PCM terminal 90
• Short to ground circuit between TP sensor terminal A and PCM terminal 90
• PCM malfunction

Flashing Diag Code P0123
TP circuit high input

DETECTION CONDITION
• If PCM detects TP sensor voltage at PCM terminal 89 is above 4.77 V after engine start, PCM determines
that TP circuit has a malfunction.
POSSIBLE CAUSE
• TP sensor malfunction
• Connector or terminal malfunction
• Open circuit between TP sensor terminal B and PCM terminal 91
• Short to reference voltage (Vref) supply circuit between TP sensor terminal C and PCM terminal 89
• PCM malfunction

Jun 26, 2014 | 2000 Mazda Protege

1 Answer

Whats a pcm for a 95 cadillac deville


PCM is the Powertrain Control Module. If you use the fan down button it will scroll through the different systems ACP ICP TCS etc. The PCM is the one you want to worry about though. Pushing the fan up button will select the pcm. Then it will give you options from there. The PCM controls ignition, shifting points, and a whole bunch of other related things.

Feb 03, 2013 | 1995 Cadillac DeVille

1 Answer

How to install a pcm on a 1996 seabring convertable


Right. Just like you said should work. Connect pcm, then the battery.

Oct 28, 2012 | Cars & Trucks

1 Answer

HOW DO YOU REPLACE THE ON BOARD COMPUTER OF A 2004 CHEVY TRAILBLAZER


Service of the powertrain control module (PCM) should normally consist of either replacement of the PCM or electrically erasable programmable read only memory (EEPROM) programming. If the diagnostic procedures call for the PCM to be replaced, the PCM should be inspected first to see if the correct part is being used. If the correct part is being used, remove the faulty PCM and install the new service PCM.
Important: To prevent internal PCM damage, the ignition must be OFF when disconnecting or reconnecting power to the PCM. For example, when working with a battery cable, PCM pigtail, PCM fuse, or jumper cables.
Important: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM module connector gaskets when diagnosing or replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the PCM.
Removal Procedure
    Important: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100%. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5000 km (3,000 mi) from the last engine oil change.
  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
  2. jsmes1027_23.gif
Loosen the PCM harness connector bolts (4) from the center of the PCM harness connectors.
Notice: In order to prevent internal damage to the PCM, the ignition must be OFF when disconnecting or reconnecting the PCM connector.
Remove the PCM harness connectors (2) from the PCM (1).
Remove the PCM retaining bolts (3) and nuts (6).
Notice: Do not touch the connector pins or soldered components on the circuit board in order to prevent possible electrostatic discharge (ESD) damage to the PCM.
Slide the PCM (1) away from the intake manifold past the mounting studs (5) and remove PCM from the vehicle.
Remove the PCM mounting studs (5) from the intake manifold ONLY if replacing the studs.


It is possible that the pcm made need to reflashed after replacement.

Nov 27, 2010 | 2004 Chevrolet TrailBlazer

2 Answers

What is the pcm in a 2004 chevy trailblazer? and how I can fix it.


PCM is what control's all of your engine sensor's, there's no repair for the PCM, but to replace.

Nov 09, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

Where is the conputer for a 1998 sunfire


here are instructions from autozone.com:


REMOVAL & INSTALLATION See Figures 1, 2, 3, 4, 5, 6, 7 and 8


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Fig. Fig. 1: The PCM is mounted behind the fender, adjacent to the EVAP canister


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Fig. Fig. 2: Remove the module-to-bracket retaining screws and ...



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Fig. Fig. 3: ... remove the PCM (1) from the mounting bracket (2)

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    Fig. Fig. 4: Detach the PCM electrical connectors
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                    Fig. Fig. 5: Remove the PCM (2) from the retainer (1)
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                            Fig. Fig. 6: The EPROM cover is retained by two screws


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                            Fig. Fig. 7: Remove the EPROM cover, if the seal tears, this is normal, do not apply an adhesive to the pad, the adhesive could drip onto the circuitry and ruin the PCM

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                            Fig. Fig. 8: Remove the EPROM by squeezing the two tabs and carefully separating the EPROM from the PCM

                            1. Turn the ignition switch OFF .
                            2. Disconnect the negative battery cable.
                            3. Remove the right hand engine splash shield.
                            4. Unfasten the horn attaching bolt, then detach the electrical connector and remove the horn.
                            5. Unfasten the module-to-bracket retaining screws, then slide the PCM out of the mounting bracket.
                            6. Detach the electrical harness connectors from the PCM.
                            7. Remove the retainer from the PCM.
                            8. If you are replacing the PCM on a 1995-96 model:
                              1. Remove the Electronic Programmable Read Only Memory (EPROM) module, also known as the KS module, cover.
                            WARNING
                            If the foam pad around the base of the EPROM cover rips during removal, this is normal and should not be remedied by applying any kind of adhesive to the pad. This could ruin the circuitry of the PCM.
                            WARNING Before removing the EPROM cover, thoroughly clean the outer surface of the PCM to remove any debris that could enter the PCM and cause damage to the circuitry.
                            WARNING To prevent a possible discharge of static electricity, which could ruin the PCM, do not touch the connector pins or the soldered components on the circuit board.
                              1. Remove the KS module by squeezing both retaining clips together and at the same time, grasp it at both ends and lift it up out of the socket.


                            To install:
                            Before replacement of a defective computer control module, first check the resistance of each PCM controlled solenoid.
                            1. If the PCM is being replaced, open the package on the new PCM and verify that the PCM numbers match or an updated number is given before you attempt installation.
                            2. If you have a 1995-96 model:
                              1. Install the EPROM into the PCM.
                              2. Install the EPROM cover and tighten the retaining screws to 25-28 inch lbs. (3 Nm).

                            3. Install the PCM retainer.
                            4. Attach the module electrical harness connectors.
                            5. Position the PCM in the vehicle, then install the module-to-bracket retaining screws.
                            6. Install the horn, attach the electrical connector, then fasten with the horn attaching bolt. Tighten the bolt to 6-9 ft. lbs. (8-12 Nm).
                            7. Install the right hand splash shield.
                            8. Check that the ignition switch is OFF , then connect the negative battery cable.
                            9. Enter the self-diagnostic system and check for trouble codes to be sure the PCM and the KS module are properly installed. For details, refer to the procedure for checking trouble codes.

                            Oct 26, 2010 | 1998 Pontiac Sunfire

                            2 Answers

                            How can fix code P0703 on mazda 6i v6 2005


                            The conditions that set this code are as follows:

                            The PCM monitors changes in input voltage on Brake Switch No. 1. If the PCM does not sense voltage changes at PCM terminal 82 when alternately accelerated and decelerated 8 times, the PCM determines that brake switch No. 1 has a malfunction

                            Possible Causes are:
                            • Brake Switch malfunction
                            • connector or terminal malfunction
                            • Short to power circuit between Brake Switch terminal D and PCM terminal 82
                            • Open circuit between Brake Switch terminal D and PCM terminal 82
                            • Malfunctioning PCM

                            Nov 11, 2009 | 2005 Mazda 6

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