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I'm an ASE Master tech myself, but I've run into a problem that my alldata doesn't go into too much detail about. On my customers Isuzu, the trans would only engage in reverse. After pulling DTC's we found a TCC fault code, we replaced the TCC and found no difference. There are 2 electrical connectors on the drivers side of the trans. When we disconnect the round one behind the selector switch, "Nuetral safety switch" the trans engages in 2nd and 3rd and reverse! We cleared codes, unpluged and pluged back in the PCM and checked for any faulty wiring. It seems that the trans is going into a default mode, but second and third and reverse engage without any slippage, illiminating clutch problems. Does this sound more like a PCM problem? Remember, the round 5 or 6 wire plug along the drivers side of the trans allows the trans to work "with limits" when UNPLUGED and only reverse "WHEN PLUGED IN".

Submitted: 19 days and 14 hours ago.

Category: Car

Value: $23

Status: CLOSED

Year: 2000
Make: Isuzu
Model: Trooper LS
Engine: v-6

Already Tried:
Pulled DTC's/found TCC code/replaced TCC solinoid/cleared battery memory, including residual memory/checked for melted wiring/checked fluid level/Disconnected the round electrical connector on the drivers side of trans behind the neutral safety switch and trans engages in 2nd and 3rd along with reverse, no slippage from clutches/reconnect that plug and trans only works in reverse!

Posted by Joe Barfield 19 days and 7 hours ago.

Info Request

Hello, So No Foward.....Even in Manual Low ?......Thanks Joey

19 days and 2 hours ago.

Reply

Hi Joey,
Thanks for responding, When the round electrical plug is in on the side of the trans, it won't engage in any gear except reverse.
When you unplug it, you can engage 2nd, 3rd and reverse with no slippage.

Posted by Joe Barfield 19 days and 2 hours ago.

Answer

Ok,Your problem is your PWM Solenoid is faulty and could have burnt the low band.....which results in No-Foward movement.....Thanks Joey

19 days and 2 hours ago.

Reply

What does PWM stand for?
Is it the shift lock solinoid?

So, when you disconnect the round electrical plug on the side, does that put the trans into a default mode to only have 2nd and 3rd and reverse,

But when it's pluged in, the trans only has reverse?????

Posted by Joe Barfield 19 days and 2 hours ago.

Info Request

Hi,many imes this is caused by servicing the trans....& damage to the wire harness can occur just by placing the filter between the harness & filter......Please hit the accept button if i was of help to you or just ask another Question....Thanks Joey.....the pwm is the pressure solenoid for the low band....& id have to say the Band is burnt up as when you plug it in you have no foward

Posted by Joe Barfield 19 days and 2 hours ago.

Info Request

Do you Understand.....Its asking for the band to apply for foward....if its burnt you get nothing

19 days and 2 hours ago.

Reply

Yes, I'm willing to replace the pressure solinoid for the low band first, I should see somekind of results other then what I"m getting now right, even if the low band is burnt? It should atleast try to engage?

Do you have an OEM part number for me to try and locate one from a dealer?

Posted by Joe Barfield 19 days and 2 hours ago.

Info Request

Hi, By the way thats a 4L30-E CHEV. Transmission......and you can try that however once it goes bad it will burn that band in a heartbeat.....ive built hundreds of these trans....90% of the time thats exactly what happens.....its to late you will not feel anything.....thats a very thick steel band, however it is lined very,very thin as a result when it looses pressure its gone!!

19 days and 1 hours ago.

Reply

Thank you Joey, this one had us stumped and even when I took it to our local trans shop for some brain storming, they were afraid to just bench overhaul it because they weren't sure if it would cure what we were after.

Do you have an OEM number for the solinoid and the low band??????

Posted by Joe Barfield 19 days and 1 hours ago.

Info Request

I have many soures, the best band & solenoid are sold from "Trans Star Industries".....www.trans star.com.......the only thing they should see is a bad band....no hard part damage at all most of the time....just sand the Drum it should be fine

Accepted Answer

They have locations all over the U.S.

Accepts:
Expert:	Joe Barfield
Pos. Feedback:	100.0 %
Answered:	11/2/2009

Master High-Tech

Transmission Tech - Management Master Winner 3rd place Entire US Southeast region #1 after masters

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Question

Optional Information

Info Request

Hello, So No Foward.....Even in Manual Low ?......Thanks Joey

Reply

Hi Joey,
Thanks for responding, When the round electrical plug is in on the side of the trans, it won't engage in any gear except reverse.
When you unplug it, you can engage 2nd, 3rd and reverse with no slippage.

Answer

Ok,Your problem is your PWM Solenoid is faulty and could have burnt the low band.....which results in No-Foward movement.....Thanks Joey

Reply

What does PWM stand for?
Is it the shift lock solinoid?

So, when you disconnect the round electrical plug on the side, does that put the trans into a default mode to only have 2nd and 3rd and reverse,

But when it's pluged in, the trans only has reverse?????

Info Request

Info Request

Do you Understand.....Its asking for the band to apply for foward....if its burnt you get nothing

Reply

Yes, I'm willing to replace the pressure solinoid for the low band first, I should see somekind of results other then what I"m getting now right, even if the low band is burnt? It should atleast try to engage?

Do you have an OEM part number for me to try and locate one from a dealer?

Info Request

Reply

Thank you Joey, this one had us stumped and even when I took it to our local trans shop for some brain storming, they were afraid to just bench overhaul it because they weren't sure if it would cure what we were after.

Do you have an OEM number for the solinoid and the low band??????

Info Request

I have many soures, the best band & solenoid are sold from "Trans Star Industries".....www.trans star.com.......the only thing they should see is a bad band....no hard part damage at all most of the time....just sand the Drum it should be fine

Accepted Answer

They have locations all over the U.S.

Car

Have your own Car question?

Related Car Topics:

Question

Optional Information

Info Request

Hello, So No Foward.....Even in Manual Low ?......Thanks Joey

Reply

Hi Joey,Thanks for responding, When the round electrical plug is in on the side of the trans, it won't engage in any gear except reverse.When you unplug it, you can engage 2nd, 3rd and reverse with no slippage.

Answer

Ok,Your problem is your PWM Solenoid is faulty and could have burnt the low band.....which results in No-Foward movement.....Thanks Joey

Reply

What does PWM stand for?Is it the shift lock solinoid? So, when you disconnect the round electrical plug on the side, does that put the trans into a default mode to only have 2nd and 3rd and reverse, But when it's pluged in, the trans only has reverse?????

Info Request

Info Request

Do you Understand.....Its asking for the band to apply for foward....if its burnt you get nothing

Reply

Yes, I'm willing to replace the pressure solinoid for the low band first, I should see somekind of results other then what I"m getting now right, even if the low band is burnt? It should atleast try to engage? Do you have an OEM part number for me to try and locate one from a dealer?

Info Request

Reply

Thank you Joey, this one had us stumped and even when I took it to our local trans shop for some brain storming, they were afraid to just bench overhaul it because they weren't sure if it would cure what we were after. Do you have an OEM number for the solinoid and the low band??????

Info Request

I have many soures, the best band & solenoid are sold from "Trans Star Industries".....www.trans star.com.......the only thing they should see is a bad band....no hard part damage at all most of the time....just sand the Drum it should be fine

Accepted Answer

They have locations all over the U.S.

Related Car Questions

Hi Joey,
Thanks for responding, When the round electrical plug is in on the side of the trans, it won't engage in any gear except reverse.
When you unplug it, you can engage 2nd, 3rd and reverse with no slippage.

What does PWM stand for?
Is it the shift lock solinoid?

So, when you disconnect the round electrical plug on the side, does that put the trans into a default mode to only have 2nd and 3rd and reverse,

But when it's pluged in, the trans only has reverse?????

Yes, I'm willing to replace the pressure solinoid for the low band first, I should see somekind of results other then what I"m getting now right, even if the low band is burnt? It should atleast try to engage?

Do you have an OEM part number for me to try and locate one from a dealer?

Thank you Joey, this one had us stumped and even when I took it to our local trans shop for some brain storming, they were afraid to just bench overhaul it because they weren't sure if it would cure what we were after.

Do you have an OEM number for the solinoid and the low band??????