Fried PCM (Lightening strike)

[Matt400]

Then WHERE is the damn thing located???

He is probably correcting my use of terms as what I would call a TCM for Transmission control module is referred to by DC as a PCM and it controls the automatic transmission functions.



If your manual trans truck has a PCM, what part of the power train would it be controlling?

 

[Bob4x4]

The pcm has always controlled the other functions. Trans. cruise contol on many years,charging system,ac etc.

The 3rd gens have many variations and production dates are needed in many cases for specing parts.

There was a recall in 03 for the pcm wiring and if corroded the pcm got replaced as well.

 

[Dieselnut59]

My '96 and '98 have a "PCM" and are both manual transmission. It controls the AC compressor, cruise control, alternator charging, tachometer and overhead temp/compass. There must be something similar, NOT in the Cummins computer on the side of the engine block, which controls these things, as the engine is running fine. Remember, these engines are used in many other applications...

 

[Matt400]

There was a recall in 03 for the pcm wiring and if corroded the pcm got replaced as well.

Yes, but for auto equipped trucks only.

 

[Matt400]

Remember, these engines are used in many other applications...

But not with the ECM thats bolted to the side of your engine block, that ECM is specific to the chassis it is mounted in.

Your ECM has full control over the A/C, Cruise and Charging system. Auto trans equipped 03's are different. I call it a TCM on those and as Bob pointed out DC calls it a PCM.

 

[pcarlson]

My '96 and '98 have a "PCM" and are both manual transmission. It controls the AC compressor, cruise control, alternator charging, tachometer and overhead temp/compass. There must be something similar, NOT in the Cummins computer on the side of the engine block, which controls these things, as the engine is running fine. Remember, these engines are used in many other applications...

The engine is common but the computer is not necessarily used in those applications as some were Dodge specific. In '03 I believe the ECM and PCM were integrated into one computer for the manual trans as autos had a seperate PCM. In other words the one on your motor is both computers in one and are replaced as one unit. Do a search for Auto Computer Exhange on the site and give them a call and they can tell you what you have and what a replacement would run.



But before you buy anything a dealer will be the only one that can tell you which module or modules are down. Everything that you have described as not working is controlled by the PCM portion of the ECM and the BUS system between all of them. The BUS in '03 is a twisted pair of wires that run between all your electronics and is controlled by CCD controllers in each of the parts.

 

[clinebarger]

The Instrument Panel Gauges and Warning Indicators are not controlled by individual circuits. The ElectroMechanical Instrument Cluster (EMIC) assembly is driven by the BCM via the Programmable Communications Interface (PCI) data bus.



For diagnosis of the EMIC/MIC, See: Body and Frame\Body Control Systems\Body Control Module\Testing and Inspection



INSTRUMENT CLUSTER

The DR Instrument Cluster is a new type of control module that includes the hardware and software necessary to function as the cluster and the body control module. The Instrument Cluster See: Instrument Cluster / Carrier houses the Speedometer, Tachometer, Fuel gauge, Coolant Temperature gauge, Oil Pressure gauge, and the Voltage gauge. The cluster positions all of the gauges using PCI bus messages received from the PCM. The cluster contains certain warning indicators, depending on engine type and options See: Driver/Vehicle Information Display. Some of the indicators are hardwire inputs and some indicators are controlled via PCI bus messages. The warning chime tone generator is contained within the cluster. The cluster includes a Vacuum Fluorescent (VF) display for the PRNDL, Total and Trip Odometers. The VF will also display warning messages such as door ajar, low washer fluid level, engine hours, and no bus communications. The cluster has the ability to set and store DTC's, communicate on the PCI bus, display engine information, and display certain inputs using the DRB III.



See: Body and Frame\Body Control Systems\Body Control Module

See: Powertrain Management\Computers and Control Systems\Information Bus



The following systems are controlled either completely by the Instrument Cluster or in conjunction with other inputs received by hardwire or via the PCI bus:





* Audible Warnings

* Brake Lamp Control

* Brake Transmission Shift Interlock (BTSI)

* Cargo Lamp Control

* Central Locking

* Door Lock Inhibit

* Enhanced Accident Response

* Exterior Lighting Control

* Exterior Lighting Fail-Safe

* Heated Seat Control

* Interior Lamp Control

* Interior Lamps - Enhanced Accident Response

* Interior Lamps Load Shedding

* Lamp Out Indicator Control

* Panel Lamps Dimming Control

* Parade Mode

* Power Locks

* Remote Keyless Entry (RKE)

* Remote Radio Switch Interface

* Rolling Door Locks

* Turn Signal and Hazard Warning Lamp Control

* Vacuum Fluorescent Display Synchronization

* Vehicle Theft Security System (VTSS)

CAUTION: Instrument clusters used in this model automatically configure themselves for compatibility with the features and optional equipment in the vehicle in which they are initially installed.

The instrument cluster is programmed to do this by embedding the Vehicle Identification Number (VIN) and other information critical to proper cluster operation in electronic memory.

This embedded information is learned through electronic messages received from other electronic modules in the vehicle over the Programmable Communications Interface (PCI) data bus, and through certain hard wired inputs received when the cluster is connected to the vehicle electrically.



Once configured, the instrument cluster memory may be irreparably damaged and certain irreversible configuration errors may occur if the cluster is connected electrically to another vehicle; or, if an electronic module from another vehicle is connected that provides data to the instrument cluster (including odometer values) that conflicts with that which was previously learned and stored.



Therefore, the practice of exchanging (swapping) instrument clusters and other electronic modules in this vehicle with those removed from another vehicle must always be avoided. Failure to observe this caution may result in instrument cluster damage, which is not reimbursable under the terms of' the product warranty. Service replacement instrument clusters are provided with the correct VIN, and the certified odometer and engine hours values embedded in cluster memory, but will otherwise be automatically configured for compatibility with the features and optional equipment in the vehicle in which they are initially installed.



Diagnostic Self Test

The Instrument Cluster is capable of performing a Diagnostic Self Test. This self test can be initiated manually by depressing and holding the trip reset button while cycling the ignition from the Off to the On position. The self test can also be activated using the DRB III. During the self test, all of the PCI bus indicators will be illuminated. The speedometer, tachometer, fuel gauge, oil pressure gauge, coolant temperature gauge, and voltage gauge will position at their calibration points. The VF display will illuminate all segments and also display the software version. The chime will sound. When the self test is complete, the cluster will return to normal operation. Turning the ignition to the Off position or the cluster detecting engine RPM greater than 0 (zero) will stop the self test.

 

[clinebarger]

POWERTRAIN CONTROL MODULE

The Powertrain Control Module (PCM) is located in the right-rear section of the engine compartment under the cowl.



Two different PCM's are used (JTEC and NGC). These can be easily identified. JTEC's use three 32-way connectors, NGC's use four 38-way connectors



The PCM operates the fuel system on vehicles equipped with gas engines. The PCM is a pre-programmed, triple microprocessor digital computer. It regulates ignition timing, air-fuel ratio, emission control devices, charging system, certain transmission features, speed control, air conditioning compressor clutch engagement and idle speed. The PCM can adapt its programming to meet changing operating conditions.



The PCM receives input signals from various switches and sensors. Based on these inputs, the PCM regulates various engine and vehicle operations through different system components. These components are referred to as Powertrain Control Module (PCM) Outputs. The sensors and switches that provide inputs to the PCM are considered Powertrain Control Module (PCM) Inputs.



The PCM adjusts ignition timing based upon inputs it receives from sensors that react to: engine rpm, manifold absolute pressure, engine coolant temperature, throttle position, transmission gear selection (automatic transmission), vehicle speed, power steering pump pressure, and the brake switch.



The PCM adjusts idle speed based on inputs it receives from sensors that react to: throttle position, vehicle speed, transmission gear selection, engine coolant temperature and from inputs it receives from the air conditioning clutch switch and brake switch.



Based on inputs that it receives, the PCM adjusts ignition coil dwell. The PCM also adjusts the generator charge rate through control of the generator field and provides speed control operation.



PCM Inputs





ABS module (if equipped)

A/C request (if equipped with factory A/C)

A/C select (if equipped with factory A/C)

A/C pressure transducer

Auto shutdown (ASD) sense

Battery temperature sensor

Battery voltage

Brake switch

J1850 bus (+) circuits

J1850 bus (-) circuits

Camshaft position sensor signal

Crankshaft position sensor

Data link connection for DRB scan tool

EATX module (if equipped)

Engine coolant temperature sensor

Fuel level (through J1850 circuitry)

Generator (battery voltage) output

Ignition circuit sense (ignition switch in on/off/ crank/run position)

Intake manifold air temperature sensor

Knock sensors (2 on 3. 7L engine)

Leak detection pump (switch) sense (if equipped)

Manifold absolute pressure (MAP) sensor

Oil pressure

Oxygen sensors

Park/neutral switch (auto. trans. only)

Power ground

Power steering pressure switch (if equipped)

Sensor return

Signal ground

Speed control multiplexed single wire input

Throttle position sensor

Transfer case switch (4WD range position)

Vehicle speed signal

PCM Outputs





A/C clutch relay

Auto shutdown (ASD) relay

J1850 bus (+/-) circuits for: speedometer, voltmeter, fuel gauge, oil pressure gauge/lamp, engine temp. gauge and speed control warn. lamp

Data link connection for DRB scan tool

EGR valve control solenoid (if equipped)

EVAP canister purge solenoid

Five volt sensor supply (primary)

Five volt sensor supply (secondary)

Fuel injectors

Fuel pump relay

Generator field driver (-)

Generator field driver (+)

Idle air control (IAC) motor

Ignition coil(s)

Leak detection pump (if equipped)

Malfunction indicator lamp (Check engine lamp). Driven through J1850 circuits.

Oxygen sensor heater relays

Oxygen sensors (pulse width modulated)

Radiator cooling fan relay (pulse width modulated)

Speed control vacuum solenoid

Speed control vent solenoid

Tachometer (if equipped). Driven through J1850 circuits.

Transmission converter clutch circuit. Driven through J1850 circuits.

 

[Dieselnut59]

The warning chime tone generator is contained within the cluster.

The following systems are controlled either completely by the Instrument Cluster or in conjunction with other inputs received by hardwire or via the PCI bus:





* Audible Warnings (Wish this did not work!)

* Brake Lamp Control (works)

* Brake Transmission Shift Interlock (BTSI) (n/a)

* Cargo Lamp Control (works)

* Central Locking (works)

* Door Lock Inhibit (not sure about this)

* Enhanced Accident Response (?)

* Exterior Lighting Control (headlights tail lights come on when engine starts)

* Exterior Lighting Fail-Safe (must have failed!)

* Heated Seat Control (dont have)

* Interior Lamp Control (not working proprly, cannot turn off with switch)

* Interior Lamps - Enhanced Accident Response (?)

* Interior Lamps Load Shedding (?)

* Lamp Out Indicator Control (wish this would fry too!! SICK of it!)

* Panel Lamps Dimming Control (does not work)

* Parade Mode (huh?)

* Power Locks (works)

* Remote Keyless Entry (RKE) (works, but no horn chirp)

* Remote Radio Switch Interface (radio works)

* Rolling Door Locks (I disabled when bought truck)

* Turn Signal and Hazard Warning Lamp Control (works)

* Vacuum Fluorescent Display Synchronization (odometer works, software code shows)

* Vehicle Theft Security System (VTSS) (no horn)





Diagnostic Self Test

The Instrument Cluster is capable of performing a Diagnostic Self Test. This self test can be initiated manually by depressing and holding the trip reset button while cycling the ignition from the Off to the On position. The self test can also be activated using the DRB III. During the self test, all of the PCI bus indicators will be illuminated. The speedometer, tachometer, fuel gauge, oil pressure gauge, coolant temperature gauge, and voltage gauge will position at their calibration points. The VF display will illuminate all segments and also display the software version. The chime will sound. When the self test is complete, the cluster will return to normal operation. Turning the ignition to the Off position or the cluster detecting engine RPM greater than 0 (zero) will stop the self test.

(Diagnostic self test worked properly)

 

[Rams-n-Hogs]

Dieselnut,



You've got 2 threads going. I posted earlier in the "911" forum. Didn't know if you checked it, or not.

 

[clinebarger]

Heres some more tests on other things that are not working. Run the code test with the key and give me the codes. does somone you know have a DRB III scan tool it whould be the fastest way to dianose this.



Overhead display SELF-CHECK DIAGNOSTICS

The CMTC/EVIC is capable of performing a diagnostic self check on its internal functions.



CMTC/EVIC diagnostics may be performed using a DRB III or by using the following procedure:





With the ignition switch in the OFF position, depress and hold the RESET and the C/T buttons.

Turn the ignition switch to the ON position.

Continue to hold both buttons until the software versions are displayed, then release the buttons.

All of the VFD segments will illuminate for 2-4 seconds . Check for segments that do not illuminate or illuminate all the time.

When the self-check is complete the CMTC/EVIC will display one of the following messages:

PASS SELF TEST

FAILED SELF TEST

NOT RECEIVING J1850 MESSAGE

To exit the self-check mode, depress the RESET button or cycle the ignition switch and the CMTC/EVIC will return to normal operation. If a Communication fault is displayed, refer to the symptom list. If a FAILED SELF TEST is displayed, the CMTC/EVIC must be replaced.



COMPASS MINI-TRIP COMPUTER



Compass Mini-Trip Computer (CMTC) data is obtained from other electronic modules (CCN, FCM and JTEC) on the J1850 Data Bus circuit. The CMTC will display dashes (- -) for any of the screens it did not receive the bus messages. The label corresponding to the missing information will be lit. If no compass mini-trip computer data is displayed, check the J1850 Data Bus circuit communications and the other modules. If the brightness level is improper check the J1850 Data Bus circuit.



SYMPTOM

HORNS INOPERATIVE



POSSIBLE CAUSES





Horn ground circuit open

Horn relay output circuit open

Horns

Instrument cluster

DTC present

Clockspring

Front control module

Fuse # 45

Horn switch

Horn switch ground

Horn switch sense open

Integrated power module

 

[Dieselnut59]

Thanks for the tips. I do have a friend with a "scan tool" and will check to see if it is the one I need...

 

[Matt400]

You could still have a bad cluster, just because the cluster is able to sweep its instruments and turn on the warning lamps doesn't mean it is able to recognize outside inputs from itself.

 

[Dieselnut59]

You could still have a bad cluster, just because the cluster is able to sweep its instruments and turn on the warning lamps doesn't mean it is able to recognize outside inputs from itself.

They are not that hard to remove... I wonder if I could substitute swap in one from a friend's truck and see if it works?

 

[Matt400]

Never tried that but they are vin programed so the vin mismatch may present another problem.

 

[mwilson]

CAUTION: Instrument clusters used in this model automatically configure themselves for compatibility with the features and optional equipment in the vehicle in which they are initially installed.

The instrument cluster is programmed to do this by embedding the Vehicle Identification Number (VIN) and other information critical to proper cluster operation in electronic memory.

This embedded information is learned through electronic messages received from other electronic modules in the vehicle over the Programmable Communications Interface (PCI) data bus, and through certain hard wired inputs received when the cluster is connected to the vehicle electrically.



Once configured, the instrument cluster memory may be irreparably damaged and certain irreversible configuration errors may occur if the cluster is connected electrically to another vehicle; or, if an electronic module from another vehicle is connected that provides data to the instrument cluster (including odometer values) that conflicts with that which was previously learned and stored.



Therefore, the practice of exchanging (swapping) instrument clusters and other electronic modules in this vehicle with those removed from another vehicle must always be avoided. Failure to observe this caution may result in instrument cluster damage, which is not reimbursable under the terms of' the product warranty. Service replacement instrument clusters are provided with the correct VIN, and the certified odometer and engine hours values embedded in cluster memory, but will otherwise be automatically configured for compatibility with the features and optional equipment in the vehicle in which they are initially installed. *******************************************



This was on page 2 of this post, I think a cluster swap would be a bad idea after reading the above. Could wind up with 2 trucks having issues if you try it.

 

[Matt400]

Ouch. . better not swap your buddies cluster in there.

I had a cluster that the dealer damaged by mistake when doing a flash update on an 03 model and learned back then one was 950. 00, don't know what they are now.

 

[Dieselnut59]

Yikes... . Thanks for the info. I will take out the relay for the headlights, make sure the brake lights work and get the thing in to be scanned sometime soon.