2001 Passport wont shift out of first

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2001 Passport wont shift out of first

Postby wheelerdealer » Tue Mar 30, 2021 10:37 pm

Hello everyone! just purchased a 2001 honda passport with 97k miles with transmission issues. runs and drive BUT, wont shift out of 1st gear. takes off and reverses just fine but after 3-4k rpm it just revs, no shifts. i put an autel scanner on it and i can see the computer control the shift solenoids. B applied in 1st, A & B in 2nd, A in 3rd, none in 4th. so the computer is doing its job but it has no clue the trans isnt actually shifting, no codes. from what i observed, its as if solenoid A isnt doing anything. the torque really falls off when both solenoids are apllied and then completely gone when its just solenoid A is energized in the higher gear? this is my first isuzu, has anyone on here experienced anything like this?

thanks in advance!
Last edited by wheelerdealer on Sun Apr 04, 2021 6:58 am, edited 1 time in total.
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Re: 2001 Passport 4160e Trans issues

Postby Buster28 » Wed Mar 31, 2021 4:51 am

The shift solenoids operate an associated shift valve. The A shift valve has 2 positions, 1st and 4th OR 2nd and 3rd. The B shift valve positions are 1st and 2nd OR 3rd and 4th.

In 1st gear the A shift solenoid is de-energized so the A shift valve is in the 1st and 4th gear position. The B solenoid is energized so the B shift valve is in the 1st and 2nd gear position. In this shift valve configuration the reaction drum brake band applied and the planetary gear set produces the 1st gear ratio.

To shift into 2nd gear the PCM energizes the Shift A solenoid, when the solenoid fluid port opens it allows pressurized ATF to act upon the end of the A shift valve moving it to the 2nd and 3rd gear position. When the A shift valve moves to the 2nd and 3rd gear position pressurized ATF is sent to the 2nd clutch piston causing the clutch to apply. With the 2nd clutch applied and the brake band still applied the planetary gear set produces the 2nd gear ratio. If the 2nd clutch slips or does not apply the transmission remains in 1st gear.

In 3rd gear both the 2nd and 3rd clutches are applied. When you place the selector in D and select Winter Mode the PCM configures the shift solenoids for 3rd gear (both energized).

With the truck stationary in Drive with Winter Mode selected will the truck accelerate at rate slower than 1st gear but reasonably fast?

Btw, the truck has a 4L30e transmission
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Re: 2001 Passport 4L30e Trans issues

Postby wheelerdealer » Wed Mar 31, 2021 5:34 am

I can’t get it into winter mode. I press the button and it comes back up, same with power. I press the power button and it stays down but the light doesn’t illuminate. I’ve checked both of the dash lights functionality with the autel, they work but these modes don’t engage.

So far, I’ve disconnected the 7 pin on the LH side of the trans next to the shifter. Reverse felt normal like before but, first gear felt way more responsive.

I noticed that the other forward gears didn’t work anymore unlike they did before. It did nothing but rev unless it was in reverse or L(low). Even from a stop, D(drive), 3 and 2 did nothing with the 7 pin disconnected.

Yes, you are correct. This is a 4L30e transmission.
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Re: 2001 Passport 4160e Trans issues

Postby Buster28 » Wed Mar 31, 2021 6:06 am

With the 7 pin connector disconnected the shift solenoids are disabled so the A shift valve is in the 1st and 4th gear position and the B shift valve is in the 3rd and 4th gear position.

When the shifter is in R the transmission manual valve ports ATF to the Reverse Clutch piston. When the shifter is in L the transmission manual valve ports ATF to the Brake Band servo.

Since R and L work OK it confirms the Overrun Clutch, Sprag Clutch, Reverse Clutch and Brake Band are working.

If shift position 2 (3rd gear with 7 pin disconnected) feels like neutral it indicates either the 2nd or 3rd clutch is slipping.

In 3rd gear, the 2nd clutch is applied and drives the planetary gear set long pinion gears, the 3rd clutch is also applied and drives the planetary gear set short pinion gears. The pinion gears are meshed together so with 2nd clutch driving the long pinions and the 3rd clutch driving the short pinions the planetary gear set is locked and the planetary carrier and tail shaft rotate at the same rpm and direction as the planetary input sun gear producing a 1:1 ratio. However, if the 2nd or 3rd clutch slips the input torque "leaks" out the slipping clutch and the tail shaft does not move.
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Re: 2001 Passport 4160e Trans issues

Postby wheelerdealer » Wed Mar 31, 2021 1:44 pm

Burnt clutches at 92k miles? Sheesh, i was taught that if an auto trans moves forward and reverse, than the problem is usually hydraulic or electrical. I was hoping I could perform some type of service but it sounds like I’m replacing or rebuilding the trans. Why I avoid anything with that GM stamp.
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Re: 2001 Passport 4160e Trans issues

Postby Buster28 » Wed Mar 31, 2021 4:06 pm

Be aware that the electrical connectors on the 00-03 4L30e are not the same as 90-99, if you look for a plug and play replacement it has to come from a 00-02 Rodeo/Passport, 00 Amigo or 01-03 Rodeo Sport. in addition a 4WD and 2WD transmission are not interchangeable because the tail shafts are different. Additionally, 00-02 Trooper and 02 Axiom 4L30e transmissions are not compatible. 03-04 Rodeo and 04 Axiom have Aisin automatic transmissions installed.
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Re: 2001 Passport 4160e Trans issues

Postby wheelerdealer » Wed Mar 31, 2021 5:44 pm

How about that 03-04 Rodeo and 04 Axiom? Are those plug and play because I would love to replace this GM trans with a AISIN. Thanks for the list of options too, I’m searching now. By the way, you wouldn’t know how much or where to get a rebuild kit from? Depending on how long it would take to get, I’d be open to the idea.
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Re: 2001 Passport 4160e Trans issues

Postby Buster28 » Wed Mar 31, 2021 8:39 pm

The Rodeo and Axiom trucks with the Aisin AW30-40LE or AW30-40LS transmissions use a standalone transmission controller that communicates the Engine Control Module (ECM) using CanBus. Your truck does not have a CanBus interface so your would need a aftermarket transmission controller for around $800 bucks and a lot of wiring mods.
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Re: 2001 Passport 4160e Trans issues

Postby wheelerdealer » Sun Apr 04, 2021 6:55 am

I understand there are a couple of culprits involved with getting those clutch packs to engage before you actually get to steels and frictions. Thinking about looking in to the shift solenoids witch makes a little more sense given my symptoms and mileage. Even a pressure regulator solenoid could be at fault because it takes moderate pressure to engage the clutches. im going to make sure i got at least 50-60psi in the line at idle and then verify my solenoids are actually controlling the valves by dropping the pan and testing them with a 12v.
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Re: 2001 Passport wont shift out of first

Postby Buster28 » Sun Apr 04, 2021 1:08 pm

You can test the two shift solenoids and TCC solenoid by applying +12 Vdc but not the Pressure Control Solenoid (PCS) or the Brake Band Solenoid because they do not use a DC control voltage. The PCS and Brake Band Solenoid use a Pulse Width Modulated (PWM) control signal.
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Re: 2001 Passport wont shift out of first

Postby wheelerdealer » Mon Apr 19, 2021 8:51 pm

..so pulled the pan and found solenoid A to flow when energized or not. In addition to the rip in the screen, I though I had found the problem for sure. Put the pan back up with new filter and solenoid, filled it up and still no shift. Shifts in to second but on after beating up the tachometer with high revs. I’m done with this transmission. My NEXT question is, would a NON 4x4 transmission be able to mate up to the transfer case? I got a line on a transmission but is not out of a 4x4 model.
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Re: 2001 Passport wont shift out of first

Postby wheelerdealer » Mon Apr 19, 2021 8:54 pm

Just reread the post about the tailshafts being different. Is it a lot of work to swap them?
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Re: 2001 Passport wont shift out of first

Postby Buster28 » Tue Apr 20, 2021 3:35 am

wheelerdealer wrote:Just reread the post about the tailshafts being different. Is it a lot of work to swap them?

You have to disassemble the entire transmission to replace the planetary gear set and attached tailshaft.
This thread shows a 2WD and 4WD planetary gear set:
https://www.planetisuzoo.com/viewtopic.php?f=2&t=147583
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