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I'm going to do it. OBD1 to OBD2 conversion. UPDATE #2623286
02/19/19 01:12 PM
02/19/19 01:12 PM
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in a cattle trailer down by th...
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Guitar Jones Offline OP
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Thanks to the gracious offer of a couple PCMs from member GarageDodge I'll have a couple OBD2 PCMs. After looking at the wiring diagrams and pin outs from the 2001 PCM and harness as compared to my '93 OBD1 Ram Charger I believe I can splice the OBD2 connectors into the OBD1 harness and add the data link connector and downstream O2 sensor. I think the downstream O2 can be tuned out though.

I plan to do this all into the Ram Charger first and get it up and running before it all gets swapped into my '74 crew. It is a stick truck and won't have speed control so that is all stuff I won't have to worry about. Right now I'm about $150 into the harnesses I got from the donor truck. If I would have looked into this further I probably could have just cut off the 3 PCM connectors and the data link connector.

Any way I'll try to post up progress and problems. If anyone that has done this swap has any tips, tricks or warnings please post them up.


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: Guitar Jones] #2623507
02/19/19 11:40 PM
02/19/19 11:40 PM
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Freeport IL USA
poorboy Offline
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Keep us posted on how this works out. Gene

Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: Guitar Jones] #2623787
02/20/19 05:10 PM
02/20/19 05:10 PM
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in a cattle trailer down by th...
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Guitar Jones Offline OP
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Many of the circuits even have the same wire colors. It looks like my biggest issue is the OBD1 has a 8 volt supply for the cam, crank and vehicle speed sensors that the OBD2 doesn't have. The OBD2 just has 2, 5 volt supplies. Not sure how big of an issue that is going to be though. I might have to change those 3 sensors to the OBD2 style. I'll have to wait until I get the full wiring diagrams. I only have the PCM pin out charts at this point.

At least I'll have an extra PCM if I smoke one. laugh2


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: Guitar Jones] #2625339
02/24/19 10:28 AM
02/24/19 10:28 AM
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Posts: 5,946
Greenville, PA
redraptor Offline
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Und vhat ees purpose ov dis experiment? work

Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: redraptor] #2625349
02/24/19 11:14 AM
02/24/19 11:14 AM
Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
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Guitar Jones Offline OP
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Originally Posted By redraptor
Und vhat ees purpose ov dis experiment? work


To be able to tune for a cam, intake, and headers and keep the factory injection system that I'm very familiar with and has easy parts availability.

I got the service manuals yesterday from Geno's Garage. Those guys have awesome service.


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: Guitar Jones] #2626200
02/26/19 03:47 AM
02/26/19 03:47 AM
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in a cattle trailer down by th...
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Guitar Jones Offline OP
Paddle faster! I hear banjo music!
Guitar Jones  Offline OP
Paddle faster! I hear banjo music!
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in a cattle trailer down by th...
Well as far as I can determine it's 41 wires to splice together. I will need to add about 6 wires and will also need a heated O2 sensor. My plan is to just butt connector the wires to make sure it works before I solder and heat shrink everything together. I hope to start next weekend.


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: Guitar Jones] #2631207
03/10/19 08:25 PM
03/10/19 08:25 PM
Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
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Guitar Jones Offline OP
Paddle faster! I hear banjo music!
Guitar Jones  Offline OP
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Joined: Dec 2009
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in a cattle trailer down by th...
It runs! Fired right up and actually runs better than before. I'll try to post up what all the conversion entails tomorrow. It's just temporary right now with butt connectors and I still need to add a few wires and the data link connector. The A/C compressor isn't turning on but I think I have the fix for that. I don't know if the speedo works yet but I should know tomorrow. It charges and every thing else seems to be working at this point so I'm pretty happy with it right now.


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: Guitar Jones] #2631248
03/10/19 10:10 PM
03/10/19 10:10 PM
Joined: May 2003
Posts: 3,017
N.W. Florida
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Fat_Mike Offline
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Just following along here, but I'm happy for you. Seems no one has traveled this path, but you figured it out. That's cool. up

Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: Guitar Jones] #2631553
03/11/19 07:33 PM
03/11/19 07:33 PM
Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
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Guitar Jones Offline OP
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in a cattle trailer down by th...
OK, got the AC compressor working by adding one wire which I'll document later and the speedo works as well. A note on the JTEC connectors, they are labeled in the FSM as C1, C2 and C3, they are all 32 way connectors. If you are looking at the PCM, connectors facing you and at the top the connectors are labeled right to left, not left to right. So C1 is on the right, C2 is in the middle and C3 is on the left.

To document this conversion I'm going to post the JTEC connector number then the cavity numbers underneath on the left. The wire color and circuit, then the corresponding SBEC 60 way connector cavity on the right with the wire color only if it's different. Once you remove the plastic covers you can see where the cavities are numbered at the end of each row, this includes the 60 way connector as well so it's pretty easy to figure out. Just take your time, do one wire at a time and double check that you are cutting the correct wires.

C1
2 LG/BK FUSED IGNITION OUTPUT TO 9 DB
4 BK/LB SENSOR GROUND TO 4
7 BK/GY IGN COIL DRIVER TO 19 GY
8 GY/BK CRANKSHAFT POSITION SENSOR SIGNAL TO 24
10 YL/BK IDLE AIR CONTROL #2 DRIVER TO 60
11 BR/WT IDLE AIR CONTROL #3 DRIVER TO 40
15 BK/RD INT AIR TEMP SENSOR SIGNAL TO 21
16 TN/BK COOLANT TEMP SENSOR SIGNAL TO 2
17 VT/WT 5V SUPPLY TO 6
18 TN/YL CAMSHAFT POSITION SENSOR SIGNAL TO 44 GY
19 GY/RD IDLE AIR CONTROL #1 DRIVER TO 39
20 VT/BK IDLE AIR CONTROL #4 DRIVER TO 59
22 RD/WT FUSED B+ TO 3 RD
23 OR/DB TPS SIGNAL TO 22
27 DG/RD MAP SENSOR SIGNAL TO 1
31 BK/TN GROUND TO 11
32 BK/TN GROUND TO 12

C2
2 VT/TN INJ #7 DRIVER TO 17 DB/TN
4 WT/DB INJ #1 DRIVER TO 16
5 YL/WT INJ #3 14
6 GY INJ #5 TO 38 PK/BK
10 DG GENERATOR FIELD TO 20
12 BR/DB INJ #6 TO 58 LG/BK
13 GY/LB INJ #8 DRIVER TO 18 RD/YL
15 TN INJ #2 DRIVER TO 15
16 LB/BR INJ #4 DRIVER TO 13
27 WT/OR VSS SIGNAL TO 47
31 5V SUPPLY TO 7

C3
1 DB/OR AC COMPRESSOR CLUTCH RELAY CONTROL TO 34
3 DB/YL ASD RELAY CONTROL TO 51
12 DG/OR ASD RELAY OUTPUT TO 57
15 PK/YL BATTERY TEMP SENSOR SIGNAL (have to add sensor, I have not done this yet but doesn't seem to affect charging)
19 BR/WT FUEL PUMP RELAY CONTROL (I think you can splice this to C3 cavity 3 otherwise it sets a fuel pump control code but I did not)
20 PK/WT EVAP SOLENOID CONTROL TO 52 PK/BK
22 BR AC SWITCH SENSE TO 27
23 LG/WT AC SELECT INPUT (splice this wire to the DB/OR wire at the AC low pressure cut out switch)
24 WT/PK BRAKE SWITCH SENSE TO 29
27 PK/DB SCI TRANSMIT TO 25 PK (also splice to cavity 7 of data link connector)
28 WT/BK CCD BUS- (add to cavity 11 of data link connector) not sure if you really need this or not.
29 DG SCI RECIEVE TO 45 LG (also splice to cavity 6 of data link connector)
30 VT/BR CCD BUS+ (add to cavity 3 of data link connector)

To finish off the data link connector you'll need fused B+ to cavity 16 and grounds to cavities 4 and 5.

I don't know if the data link connector works yet, I don't have a scanner at home. Hopefully I'll remember to bring one home from work tomorrow.

Also be sure to get the VIN from the donor truck if you want to flash your PCM.

I used a PCM from a 99 5.2 automatic 4WD truck but since the 74 is a stick I expect it to set a few codes. If you want to use a RH trans you'll probably need to use switches for the O/D and TCC or the other methods with pressure switches and such. The JTEC PCM does have outputs for O/D and TCC but without it able to read the governor pressure sensor and output sensor I don't know if it will work. I don't know if they ground the solenoids or feed them by drivers so research that before trying.

Those wires are

C1
11 OR/BK FOR TCC SOLENOID CONTROL
21 BR 3/4 SHIFT SOLENOID CONTROL




JTEC1.jpgJTEC2.jpg

"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: Guitar Jones] #2632027
03/12/19 07:20 PM
03/12/19 07:20 PM
Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
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Guitar Jones Offline OP
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Guitar Jones  Offline OP
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in a cattle trailer down by th...
The data link connector works just fine. I had a couple transmission solenoid codes (not unexpected) a fuel pump relay control code (also not unexpected) a ROM ID code (?, not a big deal) and a couple others I don't recognize. I was able to clear them but since I don't have a MIL I'm not worried about any of them.


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: Guitar Jones] #2632043
03/12/19 08:05 PM
03/12/19 08:05 PM
Joined: Jan 2003
Posts: 8,666
Buford, GA
I_bleed_MOPAR Offline
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Ran into the solenoid codes when I did the 5 spd. conversion in the Durango. Couldn't find anyone to reprogram the PCM. HotRodDave recommended a PCM from a '00-'01 Ram w/ manual transmission. Look every once in a while to try and find one but no joy. Thinking of calling one of the reman companies on ebag and explaining what I have done. Hate to blow $200 on a reman PCM that still has the MIL on.
Being you used a '99 you may have better luck with a manual PCM. up


Tim


'71 Charger 383/727
'17 Challenger SXT (Wifeys car wink )
Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: I_bleed_MOPAR] #2632152
03/13/19 07:07 AM
03/13/19 07:07 AM
Joined: Mar 2017
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Coastal Maine
Mr onetwo Offline
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Mr onetwo  Offline
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Coastal Maine
go here...http://car-part.com/ also search on Craigslist there are literally thousands of these trucks being parted out all over the country

Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: I_bleed_MOPAR] #2632161
03/13/19 07:47 AM
03/13/19 07:47 AM
Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
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Guitar Jones Offline OP
Paddle faster! I hear banjo music!
Guitar Jones  Offline OP
Paddle faster! I hear banjo music!
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in a cattle trailer down by th...
Well since I don't have a check engine light the codes don't really bother me. laugh2

Once in awhile a stick truck shows up in the local pick a part yard but you have to jump on them as soon as they hit the yard. So if I can score one that would be great but otherwise I'm not going to spend $200+ for a reman.


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: Guitar Jones] #2632319
03/13/19 03:31 PM
03/13/19 03:31 PM
Joined: Jan 2003
Posts: 8,666
Buford, GA
I_bleed_MOPAR Offline
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You'll probably run into the same thing I have. Appears to go into fuel cut at about 4200 rpm due to the codes. IIRC, in the thread I found elsewhere about the swap the OP ran into the same problem. He did the manual swap into an R/T Dakota.


Tim


'71 Charger 383/727
'17 Challenger SXT (Wifeys car wink )
Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: I_bleed_MOPAR] #2632490
03/13/19 11:57 PM
03/13/19 11:57 PM
Joined: Dec 2009
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in a cattle trailer down by th...
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Guitar Jones Offline OP
Paddle faster! I hear banjo music!
Guitar Jones  Offline OP
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in a cattle trailer down by th...
Originally Posted by I_bleed_MOPAR
You'll probably run into the same thing I have. Appears to go into fuel cut at about 4200 rpm due to the codes. IIRC, in the thread I found elsewhere about the swap the OP ran into the same problem. He did the manual swap into an R/T Dakota.


Tim


Is it because of the codes or something else. What did you guys do about the neutral safety switch? There is a park/neutral position sense terminal in the C1 connector (cavity 6 BK/WT) that I didn't hook up. I need to look through the schematics to see how that is wired but I'm thinking if you grounded the wire from the starter relay to the auto's neutral safety switch the PCM would think it's in park/neutral all the time and cut the fuel.

This was something I've thought about thanks for the heads up. More research is needed because to my thinking there isn't any other reason for the PCM to know the vehicle is in park/neutral, but who knows.

You might try snipping that wire and see what happens.


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: Guitar Jones] #2632546
03/14/19 09:05 AM
03/14/19 09:05 AM
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Buford, GA
I_bleed_MOPAR Offline
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I grounded it so it would start. But you might be onto something. work I've been meaning to wire the ground through the clutch switch anyway so my cruise will work again. grin


Tim


'71 Charger 383/727
'17 Challenger SXT (Wifeys car wink )
Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: I_bleed_MOPAR] #2632553
03/14/19 09:34 AM
03/14/19 09:34 AM
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in a cattle trailer down by th...
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Guitar Jones Offline OP
Paddle faster! I hear banjo music!
Guitar Jones  Offline OP
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in a cattle trailer down by th...
See that is probably why your cruise isn't working either, the PCM thinks it is in park (ok so there's another reason for park/neutral sense). I bet if you snip that wire the cruise would work but the engine would run away when the clutch is disengaged.


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: Guitar Jones] #2632778
03/14/19 07:55 PM
03/14/19 07:55 PM
Joined: Jan 2003
Posts: 8,666
Buford, GA
I_bleed_MOPAR Offline
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Took me a while to figure out why the cruise quit working after the swap but eventually it came to me. wink One of the codes I have is in reference to it, IIRC (being in N or P over 20 mph or something along those lines). Anyway, my thinking is it will disengage the cruise when I push in the clutch, with the PCM thinking I have gone to P or N.
Buttoning up the dash this weekend from putting in new blower and resistor, and bypassing the amp. While the column is down I plan to wire in the clutch switch. I'll let you know if it works or blows. grin


Tim


'71 Charger 383/727
'17 Challenger SXT (Wifeys car wink )
Re: I'm going to do it. OBD1 to OBD2 conversion. [Re: I_bleed_MOPAR] #2633976
03/18/19 10:11 AM
03/18/19 10:11 AM
Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
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Guitar Jones Offline OP
Paddle faster! I hear banjo music!
Guitar Jones  Offline OP
Paddle faster! I hear banjo music!
G

Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
That park/neutral sense wire does go to the speed control so I'm thinking you should have it working properly with the clutch switch in place.


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: I'm going to do it. OBD1 to OBD2 conversion. UPDATE [Re: Guitar Jones] #2634214
03/18/19 09:28 PM
03/18/19 09:28 PM
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Posts: 1,060
Atlanta, GA
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mgoblue9798 Offline
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Atlanta, GA
Guitar, any idea what year PCM's had the death flash? Looking to do an obd2 conversion myself and would like to avoid it if possible. Thanks.

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