2001 Rodeo 20mph max

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2001 Rodeo 20mph max

Postby RDUBB901 » Mon Aug 17, 2015 10:27 pm

Hello everyone. I have a 2001 Isuzu Rodeo 3.2L V6. Recently I experienced power problems. One morning as I drove to work, It felt like my transmission was slipping as I pulled off and on my first right turn. The engine just revved for a second but it went away quickly. Then about two weeks later as I was leaving work it did the same thing. But as I was driving about 40mph my Rodeo just slowed down gradually and I could only get a max of 20mph. Anything after the speedometer hits 20mph, the engine just revs. There is no check engine light, no reduced power light, no check transmission light, and no warning lights at all. I can shift with no hesitation (P,R,D etc.) but can't get over 20mph. Good fuel pressure. New spark plugs. No vacuum leaks. Does it sound like the transmission oil is too low or something worse? I am stuck. Any help is greatly appreciated. I'm new, so don't be too harsh on me. I've heard great things about this site. So I am hoping you all can help. Thanks in advance for any help.
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Re: 2001 Rodeo 20mph max

Postby Buster28 » Tue Aug 18, 2015 5:36 am

The first thing to do is with the engine running and the ATF warm but not hot, add ATF until it runs back out the fill hole. Do not shut the engine Off until the fill plug is tight.
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Re: 2001 Rodeo 20mph max

Postby Hack » Tue Aug 18, 2015 9:25 am

Are you having any starting problems? I recently lost power in my Amigo with no lights on. It turned out to be a bad alternator. Once the battery got below 10.5 volts or so, the truck acted weird.
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Re: 2001 Rodeo 20mph max

Postby RDUBB901 » Tue Aug 18, 2015 2:27 pm

Ok Buster. I will do it this afternoon when I leave work. And how long should I wait before I test it out to see if there is any difference? And to Hack, no it starts right up with no problem at all. Only about a half second long turn of the key.
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Re: 2001 Rodeo 20mph max

Postby RDUBB901 » Wed Aug 26, 2015 1:03 am

Ok. I know it took me a while but I had to leave town for an emergency. I finally got back under the truck and I made sure that the fluid is right. I let the transmission warm up. I shifted through the gears. I opened the fill hole and added fluid until it started to run back out. Then I tightened the plug. But I'm still getting the same problem. Still no warning lights either. None flashing. None solid. Any more suggestions? Thanks in advance for anything.
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Re: 2001 Rodeo 20mph max

Postby Buster28 » Wed Aug 26, 2015 6:05 am

When vehicle stationary and the selector in D with Winter Mode selected see if the vehicle will accelerate and go faster than 20 mph.
Winter Mode selects 3rd gear so it won't accelerate like 1st but still should be fairly quick.
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Re: 2001 Rodeo 20mph max

Postby RDUBB901 » Thu Aug 27, 2015 8:01 am

Hello Buster. Thanks for responding. I just tried with the WINTER button. But when I use that button and press the gas, it won't budge at all. Then when I turn the WINTER button off, it will move again. Still no warning lights. Any ideas? Again, I thank you for any help that you can give.
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Re: 2001 Rodeo 20mph max

Postby Buster28 » Thu Aug 27, 2015 11:00 am

If won't move in Winter Mode it is likely you have a defective Shift A (1-2/3-4) solenoid. When this solenoid is inoperative there is no 1-2 upshift in Drive and 4th gear will be selected in Winter Mode instead of 3rd which is why it won't move. You can run some electrical tests to confirm the problem or simply replace the solenoid. To replace it you have to remove the large transmission pan, same procedure as changing the filter with an added step.
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Re: 2001 Rodeo 20mph max

Postby RDUBB901 » Thu Aug 27, 2015 9:04 pm

Thanks Buster28. So would that inoperative solenoid that's keeping me from moving in WINTER mode also keep me from gaining more than 20mph in speed? I think that's what you're saying (1-2/3-4). If so, I'm going to get right on that and just change it. Is it normal that i dont get any warning lights for it? Also, is there anything else that I should consider changing besides that, the gasket, and filter while I'm already in there? And any part numbers or suggestions on where I should or should NOT purchase the solenoid? Sorry for so many questions. I just want to get it right. Again, thank you.
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Re: 2001 Rodeo 20mph max

Postby Buster28 » Fri Aug 28, 2015 6:14 am

There are two shift solenoids in the 4L30e transmission, one is called Shift A and the other Shift B. The Shift A is identified as 1-2/3-4, the Shift B is identified as 2-3. The shift solenoids operate the two associated shift valves.

The shift solenoid is an electrically operated hydraulic valve, you may not get a code if the problem is a blocked fluid port. Shift A has a normally closed port power off and Shift B has a normally open port power off.

The 4L30e transmission is used in Isuzu,Honda,Acura,Cadillac and BMW. You can find the solenoids on eBay or dealer parts sites.
Shift B (2-3) Honda/Isuzu part # 8-96042-664-0
Shift A (1-2/3-4) Honda/Isuzu part # 8-96042-667-0

Shift A is the bottom left and shift B is above it with the blue connector. The front of the truck is on the left of the image.
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Re: 2001 Rodeo 20mph max

Postby RDUBB901 » Fri Aug 28, 2015 6:10 pm

Ok bottom left. Thanks Buster. I ordered both solenoids on ebay. It makes sense what you're saying about the solenoid working but just blocked. I will get new fluid and a gasket and get on the job as soon as the parts arrive. And I will check and see if I can spot any obstructions while I have the pan off. Thank you for the advice. I will post as soon as I have any updates. Hopefully it will be a victory post. Thanks for the included picture also.
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Re: 2001 Rodeo 20mph max

Postby RDUBB901 » Wed Sep 02, 2015 9:05 pm

Hello Buster. I hope you can help. I just got the solenoid in the mail today. I was trying to remove the pin that holds the solenoid into place. I tried to pull downward on the pin but it doesn't seem to move. Can you give me any tips on how to remove the pin? Maybe I'm going about it the wrong way. Thanks for any help.
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Re: 2001 Rodeo 20mph max

Postby Buster28 » Thu Sep 03, 2015 4:55 am

Grab the pin close to the valve body with pliers and use a flat blade screwdriver between the two as a lever to pull it straight out.
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Re: 2001 Rodeo 20mph max

Postby RDUBB901 » Sun Sep 27, 2015 7:58 am

Stumped and frustrated. After trying multiple times and multiple ways to remove the pin, I finally decided to remove the valve body to get it out. I did that and got the solenoid replaced. Then I replaced the valve body just as it was. Replaced the filter, pan and gasket. Refilled, in steps, with transmission oil. But I am getting the same problems. Still no warning lights either. I'm still holding on to hope though. I just don't know what it is. Any suggestions for me? As always, any help that you can give is much appreciated. And thank you in advance.
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Re: 2001 Rodeo 20mph max

Postby Buster28 » Sun Sep 27, 2015 8:20 am

There is a 7 pin connector on the LH side of the transmission case by the shift linkage. Remove the connector which disables the shift solenoids and allows a manual shift mode. In manual shift mode note that L = 1st, 2 = 3rd and 3/D = 4th. See if you have 1st 3rd and 4th when you drive.
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Re: 2001 Rodeo 20mph max

Postby RDUBB901 » Thu Oct 08, 2015 4:18 pm

Wow. Buster I got back in town and I tried what you said. And yes I do have them when I disconnected the 7-pin connector. I hadn't seen speeds past 20mph in a while. But yes I was finally able to get respectable speed. So what gives? You've been great with your help and replies. And as always, any more you can give is greatly appreciated. Thank you.
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Re: 2001 Rodeo 20mph max

Postby Buster28 » Thu Oct 08, 2015 4:47 pm

With the 7 connector removed the shift solenoids are de-energized and are in the 4th gear state. The A shift solenoid fluid port is closed and the the B shift solenoid fluid port is open. This causes the A shift valve to in the 1st and 4th gear state and the B shift valve to be in the 3rd and 4th gear state.

When the Shifter is placed in L the reaction drum brake band is applied and the overrun lock out valve is locked in the R123 position. The 2nd and 3rd clutches are released causing the planetary gear set to produce a 1st gear ratio of 2.40 : 1. When the shifter is moved to the 2 position the brake band releases and the 2nd and 3rd clutches are applied, this clutch configuration causes the planetary gear set to produce a 1 : 1 ratio which is 3rd gear. When the shifter is moved to the 3 or D position the overrun lockout valve is unlocked and the overdrive section switches from a 1: 1 ratio to a 0.723 : 1 ratio. The transmission section remains in 3rd gear ( 1 : 1) so the overall ratio is 0.723 : 1 which is 4th gear.

If you can determine that the transmission is functioning as delineated above, it strongly suggests there is a problem involving the wiring between the PCM and the A shift solenoid since you have replaced the solenoid. Further troubleshooting will require an ohmmeter, do you have one?
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Re: 2001 Rodeo 20mph max

Postby RDUBB901 » Thu Oct 08, 2015 7:19 pm

Thanks. Yes it is. I do have access to an ohmmeter. What should I do?
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Re: 2001 Rodeo 20mph max

Postby Buster28 » Thu Oct 08, 2015 7:53 pm

7 Pin Connector
Pin A (6) 2-3 (Shift B) Solenoid Control 14-22 ohms
Pin B (7) PWM Brake Band Solenoid Control 6-20 ohms
Pin C (3) 1-2/3-4 (Shift A) Solenoid Control 14-22 ohms
Pin D (2) Solenoid Power (+12 Vdc)
Pin E (1)Temp Sensor
Pin F (4)Temp Sensor Return
Pin G (5)No Connection

PCM 80 Pin Connector E-22 is closest to the fender.
PCM 80 Pin Connector E-21 is closest to the engine.

With the PCM connectors removed measure the resistance from
E-22 Pin 43 to E-21 Pin 5 Shift A
E-22 Pin 43 to E-22 Pin 31 Shift B

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Re: 2001 Rodeo 20mph max

Postby remogw » Mon Oct 12, 2015 12:46 am

I created this attached image to help me find 2 broke wires. My Speed Sensor output wires were bad causing my 01 Trooper not to go out of first gear. Similar symptoms.
Ohms checks found the problem.
Check from the PCM Red/Blue connectors in the engine compartment. No need to crawl under the car.
Example...
My problem was the M-15 connector itself on top of the transmission. Follow the schematic back to the PCM from the M-15 connector...check for ohms between pins J2-22 and J2-55. Mine showed open when bad. Should have a small resistance due to the solenoid.
Good luck.
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Re: 2001 Rodeo 20mph max

Postby RDUBB901 » Mon Oct 12, 2015 10:15 am

Thanks Buster and remogw. I have to get another ohm meter this afternoon. The one I have is jumping all over the place. Either that or I'm just not using it properly. But I will find out this afternoon when I get the new one. Thanks a lot though.
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Re: 2001 Rodeo 20mph max

Postby RDUBB901 » Tue Oct 13, 2015 9:12 am

Hello Buster. Maybe I'm going about this all wrong. Probably so. Sorry to bother you. But any directions on how I can correctly check the resistance? As always, any help or direction you can provide is appreciated. Thank you.
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Re: 2001 Rodeo 20mph max

Postby Buster28 » Tue Oct 13, 2015 9:35 am

Pretty basic, disconnect the battery. Carefully remove the two PCM 80 pin connectors, locate the correct harness connector pins and verify the color code and then measure the resistance on the R x1 scale. If you read infinity there is an open circuit.
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Re: 2001 Rodeo 20mph max

Postby RDUBB901 » Sat Oct 17, 2015 10:21 pm

Ok this is what I got

E-22 Pin 43 to E-21 Pin 5 Shift A  =17.9 ohms
E-22 Pin 43 to E-22 Pin 31 Shift B =17.9 ohms

I also checked
E-22 Pin 22 to E-22 Pin 55 as suggested by remogw and got 2.83 K ohms.
I checked multiple times and used this as a reference
20151017_205219.png
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Re: 2001 Rodeo 20mph max

Postby Buster28 » Sun Oct 18, 2015 5:40 am

Your test indicates the shift solenoids and speed sensor are connected to the PCM. Check the PCM connector pins for corrosion.
It is not likely you have a speed sensor problem because Winter Mode (3rd gear) cannot be selected when the vehicle is stationary.

When the vehicle is stationary and the selector is in the D position the PCM energizes shift B and de-energizes shift A. In this configuration your vehicle accelerates normally in 1st gear. Under the same stationary condition in D, when Winter Mode is selected the PCM energizes shift A and de-energizes shift B which configures the shift valves for 3rd gear. If for some reason shift A does not energize in Winter Mode both solenoids are de-energized which configures the shift valves for 4th gear. It is pretty difficult to get moving from a stationary position in 4th gear. This is the symptom you described when you tested Winter Mode.
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