I have a 1988 Chevy 3500 pickup with the 6.2 diesel engine. I need the correct ecm computer unit. Does anyone know what model/serial number exists on the one that I could use? Does anyone have access to an extra one? I already purchased one that was supposed to be the correct one but it turned out not to be.

Thanks.

the 6.2 has no engine computer. it's fully mechanical injection. Exactly what computer are you looking for?

the 6.2 has no engine computer. it's fully mechanical injection. Exactly what computer are you looking for?

C code has a computer to run the emissions crap.......

C code has a computer to run the emissions crap.......

That's news to me. I thought the emissions crap was run by a single signal off the TPS, not by any computer.

eh.... if i'm wrong, it wouldn't be the first time.... at least I don't have a problem admitting it when I am......

Nobody here understands my sarcasm.

I have a 1988 Chevy 3500 pickup with the 6.2 diesel engine. I need the correct ecm computer unit. Does anyone know what model/serial number exists on the one that I could use? Does anyone have access to an extra one? I already purchased one that was supposed to be the correct one but it turned out not to be.

Thanks.
What are the symptoms that make you think you need a computer? AFAIK, if you have a 3500, you have a J-code engine and a THM 400 transmission... neither of which are computer controlled.

If your brake warning light is flashing a code, (especially code 9), then pull the stop/hazard fuse for a few minutes, and plug it back in to see if the code goes away. (Code 9 appeared when I pulled the instrument panel and replaced it, but the above trick put it right.)

Anything else malfunctioning, the guys here are very knowledgeable if you give us more detailed symptoms. Especially tell us what kind of truck (C/K, Suburban, Crew Cab, new body style / old body style...)

Nobody here understands my sarcasm.
C'mon Trios, it's Easter! Your sarcasm can wait till Monday...:D

No computer in mine save for the cruise control brain that's dead and it's a C code.

Theres a TPS switch that says right on it(i noticed the other day) EGR and EPR. It's a switch that when the throttle is turned a certain amount the emissions vac solenoids receive or lose power causing them to turn the vac on or off and work the emissions devices.

Everyone says that TPS controls the 700R4's lockup but i believe otherwise. There's nothign written on the sensor about TCC or lockup but it says in two spots near the wires EGR and EPR.

My truck is a 1988 Chevy Cheyenne 3500 2 door 4x4 6.2 diesel

You shouldn't have any sort of computer then....

Seem like the OP should talk with another poster Nirts who is also having a problem with his seemingly existent ECM. He even has an ALDL

I can hear you. *snicker*

OK ... You guys have in you sigs. 3/4 and 1 tons J codes. I have the pesky C code. 1228812 is a part # that I have seen on my ECM. If memory is correct there is another # out there that replaced this one. Wether or not it's the correct one? May have something to do with the EPROM chip or Memcal?

OK ... You guys have in you sigs. 3/4 and 1 tons J codes. I have the pesky C code. 1228812 is a part # that I have seen on my ECM. If memory is correct there is another # out there that replaced this one. Wether or not it's the correct one? May have something to do with the EPROM chip or Memcal?

Is it a black plastic like box? That's for the cruise control i believe. My blazer has one shoved under the dash somewheres.

There is no engine computer on a mechanical injected 6.2 diesel, period. Regardless of the trans you have, there is no trans computer either. TH400 and 700R4 are vac and cable controlled respectively. TH400 uses vac to control the modulator, and the TH700R4 uses a TV or Throttle Valve Cable to control line pressures and shift points.

There are no sensors on the engine for the computer to get data from. There are switches like the high idle switch and the glow plug inhibit switch. the only sensor i know of is the temp sender for the gauge, if you can even call that a sensor.

yea like everyone said only C code trucks got the computer if they were late enough. the computer took stuff like the engine speed vehicle speed, the engine temp, and throttle postion to know when to turn on the EGR and EPR crap and the TCC lock up stuff. that as far as i know is the only computerized thing on a 6.2 other than the cruise deal.

C'mon Trios, it's Easter! Your sarcasm can wait till Monday...:D

im in canada and we have easter monday so wait till tuesday trios :p:

SORRY.... 4320 answered before I posted this.....

Iamdave. sorry but I do have a ECM in my 1988 CHEVY Suburban 6.2 Scottsdale V10 1/2 ton 4x4. It does have sensors and wires that connect to them. I have in my hand a wire diagram for the ECM CONNECTOR IDENTIFICATION and have used it. The input sensors include map, tps, coolant temp, engine speed, vehicle speed. The output controls ECM LAMP driver, tcc solenoid, cold advance, egr solenoid, egr vent solenoid, epr solenoid. Other accompaning wires are: diagnostic terminal, 5 volt reference, sensor ground, ground, ecm fuse key/switch and battery 12 volt. These wires are grouped into 2 bundles and connect to the ecm thru a 24 pin connector and a 32 pin connector but only half the pins are used.... because it's a diesel.
You have cruise control??? cool I don't. Nor do I have anti lock brakes.
The ECM does control the 700r4 torque convertor lock up function and the C code engine's EGR/EPR system and "possiblly" the cold advance.
I didn't design it. I'm just trying to keep mine running.

SORRY.... 4320 answered before I posted this.....

Iamdave. sorry but I do have a ECM in my 1988 CHEVY Suburban 6.2 Scottsdale V10 1/2 ton 4x4. It does have sensors and wires that connect to them. I have in my hand a wire diagram for the ECM CONNECTOR IDENTIFICATION and have used it. The input sensors include map, tps, coolant temp, engine speed, vehicle speed. The output controls ECM LAMP driver, tcc solenoid, cold advance, egr solenoid, egr vent solenoid, epr solenoid. Other accompaning wires are: diagnostic terminal, 5 volt reference, sensor ground, ground, ecm fuse key/switch and battery 12 volt. These wires are grouped into 2 bundles and connect to the ecm thru a 24 pin connector and a 32 pin connector but only half the pins are used.... because it's a diesel.
You have cruise control??? cool I don't. Nor do I have anti lock brakes.
The ECM does control the 700r4 torque convertor lock up function and the C code engine's EGR/EPR system and "possiblly" the cold advance.
I didn't design it. I'm just trying to keep mine running.


Weird. My 85 was able to do all that mechnically as i've got no ECM that i could find when i had the truck in pieces for the SM465 trans swap. :confused: I don't have a DLC connector either, nor an ECM light. I"ll bet that ECM is just for the emissions crap-ola and the TCC lockup. I can assure you if you have a DB2 IP then it's got nothing to do with running the engine itself though.

Wonder if My friends 90 burb has what you have? I"ll have to ask him, although his burb is a 3/4 ton with a TH400 so maybe it doesn't have it.

Can't see why GM had to screw with it an go electronic. Figures that GM has to fix it til it's broke.

Getting back on track.....

I have a 1988 Chevy 3500 pickup with the 6.2 diesel engine. I need the correct ecm computer unit. Does anyone know what model/serial number exists on the one that I could use? Does anyone have access to an extra one? I already purchased one that was supposed to be the correct one but it turned out not to be.

Thanks.

What ecm did you buy? any part # printed on it? also check for a few letters near the #. That may tell you what is programed into it. For that matter take the SMALL cover off and look inside for a computer chip. Make sure it's in there. Are you replacing one or installing one that wasn't there but should have been?
I only have limited info on my system but I'll share if it can help.

yea that ECM is for emissions crap. in my chilton manual it says in 86 cali 6.2s were fitted with them so the EGR and EPR and TCC lockup were done at the proper times to reduce as much emissions as possible.

My '84 6.2L has a computer. Yellow box to the left of the drivers feet.
I'm pretty sure it does nothing, but I don't really know!

My truck is a 1988 Chevy Cheyenne 3500 2 door 4x4 6.2 diesel
Do you have a "Service Engine Soon" lamp that lights when you first turn the key on?

OK ... You guys have in you sigs. 3/4 and 1 tons J codes. I have the pesky C code. 1228812 is a part # that I have seen on my ECM. If memory is correct there is another # out there that replaced this one. Wether or not it's the correct one? May have something to do with the EPROM chip or Memcal?
See, I could completely understand an ECM for a C-code engine. What I can't understand is an '88 K3500 "Una Tonada" having an ECM when my California-spec, totally stock '89 K2500 does not. That's why I asked if he sees a "Service Engine Soon" light with key on. Mine doesn't do this, and I verified the bulb was good when I had the cluster out recently. There's just nothing on my truck to make it light up in the first place...