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Old 12-20-2018, 12:03 AM   #16
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Re: OBD Code Definitions 1993 Trans Sport

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Originally Posted by LMP View Post
This is the actual code list from the '93 tranport shop manual...
www.avigex.ca/xport/dtc18.jpg
...
Where is the crank/cam shaft position sensor located?
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Old 12-20-2018, 12:18 AM   #17
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Re: OBD Code Definitions 1993 Trans Sport

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...the classic problem is purge canister valve with DTC26.
I found a bunch of cracked and collapsed rubber lines that I will change out.
I found the Purge Valve Solenoid (I think)... kinda top center of engine.

Is there a valve or any thing serviceable right on the Carbon (Vapor) Canister besides maybe a filter?
I found these parts online:
Vapor Canister https://www.thewrenchmonkey.ca/auto-...apor-canister/
Vapor Canister Filter https://www.thewrenchmonkey.ca/auto-...nister-filter/
Vapor Canister Purge Solenoid https://www.thewrenchmonkey.ca/auto-...urge-solenoid/

Vapor Canister Purge Valve https://www.thewrenchmonkey.ca/auto-...r-purge-valve/
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Old 12-20-2018, 01:47 AM   #18
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Re: OBD Code Definitions 1993 Trans Sport

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Quad driver faults tend to lead towards an ECM......

Basically, a Quad driver commands up to 4 different circuits......if the quad driver gets the wrong data from a circuit, it sets a quad code.....

Not easy to diagnose....proper testing, is you isolate each circuit the quad driver runs..........this is labor intensive, and most techs would just swap out an ECM from another vehicle(must be the same number, and if the PROM is different, have to swap them also), and if it took care of the problem, then they would just order an ECM, with the latest PROM for it.....

Like I said, more often than not, it's the ECM.......but with this time and mileage on it, it could be the circuit, a component in the circuit, or a bad connection also.....like I said, not easy to diagnose.....
Does this 1993 3.8 have an interchangeable PROM? Can I put the original PROM into a matching PCM from the wreckers?
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Old 12-20-2018, 02:46 AM   #19
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Re: OBD Code Definitions 1993 Trans Sport

Here's a neat site I found. This thread discusses some of the same material in this thread.
https://forums.aaca.org/topic/202125...-van-pcm-prom/
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Old 12-21-2018, 07:51 AM   #20
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Re: OBD Code Definitions 1993 Trans Sport

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Originally Posted by tinkering View Post
Where is the crank/cam shaft position sensor located?
www.avigex.ca/xport/sensors.jpg
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Old 12-22-2018, 07:51 PM   #21
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Re: OBD Code Definitions 1993 Trans Sport

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Thanks for that great diagram.
Where can a guy get a download of that shop service manual?
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Old 12-27-2018, 07:20 AM   #22
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Re: OBD Code Definitions 1993 Trans Sport

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..Where can a guy get a download of that shop service manual?
It is a hard copy manual...2 volumes.., about 2000 pages, that I had bought from GM when I bought the car. THe "user manual" contained the "order form" from GM. This is something that is no longer available in the digital world...
My website www.avigex.ca/xport contains a lot of scanned pages.
It used to be fully open to all a few years ago but the heavy traffic (specially from Russia..and I feared contamination ) ended up busting the allowed traffic on my website so I provide specific links on request now...

EDIT: exactly this one on ebay
https://www.ebay.com/itm/1993-Pontia...k:2:tongue:f:0
..and contrary to the description the seller gives, it covers both the 3.1 and the 3.8
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Old 01-14-2019, 02:08 PM   #23
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Re: OBD Code Definitions 1993 Trans Sport

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Originally Posted by LMP View Post
It is a hard copy manual...2 volumes.., about 2000 pages, that I had bought from GM when I bought the car. THe "user manual" contained the "order form" from GM. This is something that is no longer available in the digital world...
My website www.avigex.ca/xport contains a lot of scanned pages.
It used to be fully open to all a few years ago but the heavy traffic (specially from Russia..and I feared contamination ) ended up busting the allowed traffic on my website so I provide specific links on request now...

EDIT: exactly this one on ebay
https://www.ebay.com/itm/1993-Pontia...k:2:tongue:f:0
..and contrary to the description the seller gives, it covers both the 3.1 and the 3.8
Thanks LMP!
I missed this reply so hense the late reply.
The link to your site says 'forbidden'. How do I access is, or do I?
😊
I'm just getting around to this work now so I have to review the whole thread but that is fine.
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Old 02-01-2019, 10:08 AM   #24
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Re: OBD Code Definitions 1993 Trans Sport

Yeah..as I stated in my previous post, "avigex.ca/xport" is not "open" access (for reasons I specified) ....just links for specific items like the one I gave for sensors..
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Old 02-02-2019, 04:16 PM   #25
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Quote:
Originally Posted by LMP View Post
It is a hard copy manual...2 volumes.., about 2000 pages, that I had bought from GM when I bought the car. THe "user manual" contained the "order form" from GM. This is something that is no longer available in the digital world...
EDIT: exactly this one on ebay
https://www.ebay.com/itm/1993-Pontia...k:2:tongue:f:0
..and contrary to the description the seller gives, it covers both the 3.1 and the 3.8
The ebay link eventually opened for me but I don't have $90 CAD including shipping, for that right now. I will keep mooching off of you
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Old 02-20-2019, 04:26 PM   #26
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Re: OBD Code Definitions 1993 Trans Sport

OK, I picked up some parts from the wreckers. I swapped out my original PROM into the wrecker ECM. On the road test the check engine light was going on and off for awhile. For awhile I thought we might have some positive results but after the engine warmed up it started to limp again, then I ran out of gas! I'm back at home now.
I think I remember that the EGR valve doesn't activate until the engine warms up. I'm going to swap it for the wrecker unit. Then I'm going swap the carbon canister and the purge valve.
I'll report back in awhile. 😊
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Old 02-28-2019, 05:24 PM   #27
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Re: OBD Code Definitions 1993 Trans Sport

  • Both the original and the wrecker ECMs give me the same scenario. I had to use the old PROM because the wrecker unit is out of a 93 Buick LeSabre. NO RESULTS: All Codes 17, 18, 26, 56 remained
  • I replaced the EGR Valve with a wrecker unit. NO RESULTS: Code 56 is still there.
An interesting thing though, is the resistance readings are quite different between the two EGR valves.
*The original unit reads 2 coils around 50 ohms and 1 around 25 ohms.
*The wrecker unit reads more like LPM said I should be finding; 2 coils around 25 ohms and 1 coil around 12 ohms. LPM, maybe I should use the wrecker unit but the other one is not that old??


  • RESULTS: I replaced the ICM (Ignition Control Module) with a wrecker unit. The tachometer is working again (It had quit ages ago)! So far it's running well, not going into 'limp' on the road test. NO MORE CODE 17 showing up. Hope it doesn't come back.
  • RESULTS: I replaced the CMP sensor (Cam Position Sensor) with a wrecker unit. NO MORE CODE 18 showing up. Hope it doesn't come back.

  • I have not located a used TVS (Canister Purge Valve) at the wreckers yet. I may have to order one from Amazon $40.00 CAD.
There should be a bench test for the purge valve though. How many volts 5, 10, 12, should I use to energize the solenoid to see if the port opens? I think it is either open or closed, no graduating positions, correct? I am hoping it's faulty and the cause of code 26.

  • There are 2 CTSs (Coolant Temp Switchs) that I found: *One is for the temp gauge; I think it's the one with 1 wire. *The other one (it has 2 wires) gives info to the ECM (I think) for other functions like the TVS and EGR etc.. THIS ONE HAS GOT TO BE THE MOST DIFFICULT TO ACCESS EVER!!! You have to remove both halves of the air cleaner housing and pipe, and STAND ON YOUR HEAD! If you have short fingers forget it, you have to start pulling the Idle Air Control stuff apart.
*Apparently there is a temperature/resistance chart for bench testing these sending units.
Does anybody have that info?


I am going to try all this stuff before I change out the canister with a wrecker unit I bought (This canister does not have a replaceable filter).

I'm starting to wonder if it might be a bad wire or connection somewhere; I pray not.
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Old 03-01-2019, 03:42 AM   #28
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Re: OBD Code Definitions 1993 Trans Sport

At some point in that era (maybe 1993, or 94-95) the canister purge solenoid went to a pulse width modulated (PWM) arrangement where the ECM would turn the solenoid on and off rapidly at part throttle, low load, to purge the EVAP canister. The solenoid is supplied by 12VDC and switched by the ECM. You can measure the resistance of the solenoid, and expect to read around 25-35Ω. You could also apply 12V to the solenoid and listen for the click when it moves.

As for the temperature sensor resistances, this table is still valid:

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Old 03-01-2019, 08:15 AM   #29
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Re: OBD Code Definitions 1993 Trans Sport

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At some point in that era (maybe 1993, or 94-95) the canister purge solenoid went to a pulse width modulated (PWM) arrangement where the ECM would turn the solenoid on and off rapidly at part throttle, low load, to purge the EVAP canister. The solenoid is supplied by 12VDC and switched by the ECM. You can measure the resistance of the solenoid, and expect to read around 25-35Ω. You could also apply 12V to the solenoid and listen for the click when it moves.

As for the temperature sensor resistances, this table is still valid:

THANKS BBT! That is exactly what I was looking for!
I'll let you know the results.
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Old 03-01-2019, 09:19 AM   #30
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Re: OBD Code Definitions 1993 Trans Sport

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Originally Posted by Blue Bowtie View Post
At some point in that era (maybe 1993, or 94-95) the canister purge solenoid went to a pulse width modulated (PWM) arrangement where the ECM would turn the solenoid on and off rapidly at part throttle, low load, to purge the EVAP canister. The solenoid is supplied by 12VDC and switched by the ECM. You can measure the resistance of the solenoid, and expect to read around 25-35Ω. You could also apply 12V to the solenoid and listen for the click when it moves.

As for the temperature sensor resistances, this table is still valid:

The 1991 and 1992 Chilton Manual (all that I have indicates the canister purge valve is a TVS (Thermostatic Vacuum Switch). My 93 has the PWM design.

The purge valve (PWM design) reads around 37 or 38 ohms across the coil contacts at 70F. It's just above the high end of the spec range but is that good enough?
The solenoid energizes (opening the port) using a 9 volt battery. The valve holds vacuum indefinitely, and opens up sufficiently. If the resistance is good enough being just over the high end it looks like the purge valve is usable?
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