Are there any faults in the Jeep AW4 transmission?

Diagnosis of faults in the Jeep AW4 transmission. The automatic transmission used in the Jeep XJ Cherokee is nearly bullet proof. Seldom does it ever give trouble. Maybe that is why it is so hard to find good information on how to fix it when it occasionally does act up.

What kind of transmission does a Jeep XJ Cherokee use?

The automatic transmission used in the Jeep XJ Cherokee is nearly bullet proof. Seldom does it ever give trouble. Maybe that is why it is so hard to find good information on how to fix it when it occasionally does act up. The same transmission is used in 600hp turbo Supras so it can handle a lot of abuse.

Where does the torque converter lock up in a jeep?

In the 1-2 position, the torque converter can lock up in first or second gear. In 3 or D it will only lock in 3 or four. The normal sequence is to shift to second, and then third, then forth and then the torque converter will lock up giving an engine speed of about 2700 RPM at 55 MPH.

What causes transmission to hang in first gear?

If either the black wire or the white wire are damaged in the transmission wiring harness, the transmission may hang in first gear. The harness passes right behind the transfer case shift linkage and can be damaged by the linkage if it is moved around by a transfer case drop or something like that.

Why does my Jeep Grand Cherokee not shift into overdrive?

BTW: it’s a 95 4.0l grand cherokee w/130k on it. if u have a push button on dash for overdrive c if it works? borg warner has alot of overdrive problems with 42re and 44re overdrives check ur wiring out on transmission does it happen all the time or maybe when trans is cold or hot?

Can a Jeep Grand Cherokee Drive in two gears?

You’re often still able to drive the vehicle, but it only operates in one or two gears. For example, you may find that you’re only able to drive the car in the automatic transmission’s third gear, only being able to select the other two gears when you shift the transmission manually.

Is there a problem with my Jeep Grand Cherokee?

Very often, this will solve the problem. But Jeep Grand Cherokees seem especially prone to more serious transmission problems, and some owners are quite vexed at their inability to determine the causes.

When did Jeep start using The 42RE transmission?

Jeep Grand Cherokee started using the 42RE transmission in 1993 1/2 models with the 4.0L engine. The “4” stands for 4-speed, “2” is for torque capacity, “R” is for rear-wheel drive, and “E” is for electronically controlled.

What kind of transmission does a Jeep ZJ have?

The Aisin Warner AW4 transmission is an automatic shift, four-speed overdrive transmission used in the 1987-2001 Jeep XJ Cherokee and MJ Comanche models. Its only year in the ZJ Grand Cherokee was 1993, and only with the six-cylinder. The AW4 is predominantly found behind the AMC 4.0L (242 ci) I6 engine.

What kind of transmission does a Jeep Grand Cherokee use?

Aisin-Warner AW4 Transmission. The Aisin Warner AW4 transmission is an automatic shift, four-speed overdrive transmission used in the 1987-2001 Jeep XJ Cherokee and MJ Comanche models. Its only year in the ZJ Grand Cherokee was 1993, and only with the six-cylinder. The AW4 is predominantly found behind the AMC 4.0L (242 ci) I6 engine.

Is the AW4 transmission the same as the XJ?

Year splits, aka “will this transmission fit my XJ?” 1987-1990, the AW4 had a 21 spline output shaft, a 1 pulse per revolution reed switch Output Speed Sensor, no Input Speed Sensor, and a 0.705:1 OD ratio. 4.0L and 2.5L transmissions are fundamentally the same, except for the torque converter and bellhousing, which are unique for each motor.

What kind of transmission does a Jeep Wrangler have?

Jeep Automatic Transmission Guide. A summary of the automatic transmissions used in various Jeep vehicles. 42RLE: Four-speed automatic transmission was available from 2003 to 2006 Jeep TJ Wrangler with 4.0L engines. 45RFE: A four speed automatic transmission was used in 1999 Jeep Grand Cherokees with 4.7L engines.

What kind of transmission does a Jeep Comanche use?

The Aisin Warner AW4 transmission is an automatic shift, four-speed overdrive transmission used in the 1987-2001 Jeep XJ Cherokee and MJ Comanche models.

What happens when the TCU is off on AW4?

One controls the torque converter lockup and the other two select the four gears in a binary fashion. As you can see, if the TCU has no power, you will get forth gear in D position. Also with the TCU off, 3 will give you third gear and 1-2 will give 1st gear. You can’t get 2nd manually.

What is the electronic control system on an AW4 Jeep?

See BODY CODE DESIGNATION table. The electronic control system for the AW-4 transmission controls transmission shift points and torque converter lock-up. Electronic control system consists of Transmission Control Module (TCM), valve body solenoids, throttle position sensor, speed sensor, neutral safety switch and brake switch.

How does the torque converter work on a jeep AW4?

Normally, the transmission with switch to 2nd at 20 to 25 mph depending on the TPS signal. It gets its speed reference from the internal speed sensor so if you are in low range, the speed will be different. In the 1-2 position, the torque converter can lock up in first or second gear. In 3 or D it will only lock in 3 or four.

What was the automatic transmission on a 1997 Jeep?

There are alternate names for the transmissions used on 1997 Jeep Cherokees. The AW4 is also referred to as the A340, the 30RH as the A904, the 46RH as the A518 and the 42RE as the A500.

What’s the length of a jeep AW4 transmission?

The AW4 as found in Jeep vehicles has a length of 25-3/8″. The AW4 has a removable bellhousing with a port for the crank position sensor.

When did the CJ T-90 transmission come out?

T-90: The T-90 was the standard three speed for CJ and their military counterparts built from 1945 until 1971. It was also the standar transmission for Willys Wagons, Willys Pickups, FC trucks, and Jeepster/Commandos during this time period.

What should the engine speed be on a jeep AW4?

The normal sequence is to shift to second, and then third, then forth and then the torque converter will lock up giving an engine speed of about 2700 RPM at 55 MPH. Armed with this information, you could be able to sort through nearly any fault in the AW4.

Why does my Jeep Grand Cherokee not shift gears?

For example, you may find that you’re only able to drive the car in the automatic transmission’s third gear, only being able to select the other two gears when you shift the transmission manually. The most common cause of transmission problems is the easiest to fix: check the fluid level in the transmission and restore it to the proper levels.

Where is the transmission temperature sensor on a Jeep Grand Cherokee?

Inputs for TCC include OD off switch, TPS, engine rpm, VSS, output speed and transmission temperature sensor. The transmission temperature sensor is mounted on the overdrive/torque converter clutch solenoid assembly and provides input to the TCM.

Where is the Transmission Control Unit on a jeep?

A transmission control unit located under the passenger side panel under the glove box controls the AW4. The panel is one piece all the way across and there are more control boxes on the driver side so be careful when you remove it.

How do you remove transmission from Jeep Cherokee?

Remove the transmission. Pulling slightly back on the transmission will disengage it from the engine. Make sure that you and your partner have the transmission balanced well on the jack at this point because, if it starts to fall, it will be very hard to stop. Slowly lower the jack until the transmission can be slid out from under the Cherokee.

Is the AW4 transmission compatible with a 4.0L engine?

The AW4 is an electronically controlled transmission, and is therefore compatible only with the 4.0L engine and its PCM package. We do not offer any conversion from this transmission to V6 or V8 power.

Is the AW4 transmission on the Jeep XJ Cherokee?

Diagnosis of faults in the Jeep AW4 transmission. The automatic transmission used in the Jeep XJ Cherokee is nearly bullet proof. Seldom does it ever give trouble.

How to remove automatic transmission from Jeep Cherokee?

Push the transmission over to the passenger side until the transfer case linkage comes free which will cause the whole unit to drop even farther. Disconnect electrical connections, breather lines, sensors, and shift linkages from the top of the transmission.

Why is my AW4 transmission not working at 25 mph?

The harness passes right behind the transfer case shift linkage and can be damaged by the linkage if it is moved around by a transfer case drop or something like that. Normally, the transmission with switch to 2nd at 20 to 25 mph depending on the TPS signal.

What kind of transmission fluid does a Jeep Cherokee use?

“Mopar automatic transmission fluid or equivalent labeled dexron III of mercon. from other research it shows from 1987-2001 for the 4.0L they used the Aisin warner AW-4 4 speed transmission. I guess thats what i have. Now what do i do? haha. some people say they are close and compatible.

Why is the EGR valve at idle not working?

This could be caused by one of two possibilities… either the EGR solenoid is defective or the vacuum hose is attached to the wrong port on the EGR solenoid. Resolving this ‘continuous vacuum to the EGR valve at idle’ problem will solve the EGR valve and rough idle issue.

Why does my Jeep Wrangler not shut down?

Without digging into the other thread, my problem is either: 1) Battery cable connected, fuel pump won’t come on when key-on OR cranking. 2) Fuel pump won’t shut off the instant the battery cable is connected, maintains 35 psi and Jeep will start and run, but when I key-off the fuel pump continues to run.

Is there a no start, no crank Jeep Wrangler?

2004 JEEP WRANGLER SPORT 4.0L I6 Was working on this 04 Jeep and it had a no start, no crank condition. Checked all the fuses, power and ground wires on the starter, engine and body but, found the wires were all properly connected and the fuses were okay. The battery was fully charged.

When do you know your Jeep Cherokee ignition switch is bad?

If your Jeep Cherokee is starting right up, but then immediately dies, that is a very good indication that the ignition switch is bad. Here’s what happens. You aren’t getting power to the ignition or fuel pump while the key “rests” in the run position.

What to do if your Jeep AW4 is not working?

To test if the trouble is electric or mechanical, pull the fuse to the TCU or disconnect the wiring harness. 1-2 will give first gear only, 3 will give third gear. D will give forth gear. The torque converter will not lock manually. You can drive the Jeep just fine this way until you figure out what is wrong.

What should the voltage be on a jeep AW4?

The 1990 and earlier used +12 to lock and zero to unlock. The 1991 and up is the opposite. The TPS voltage should read about .5 volts with the throttle closed and 4.5 volts with it open. It should transition smoothly between the two numbers. It seems to work fine even if the voltage is a little off.

What is the automatic shut down relay on a jeep?

ASD relay “Automatic Shut Down relay” used on all EFI jeeps. 1990 to present. What is it? It is a safety device, that exists by LAW and for good reasons. It CAN prevent FUEL fires (the Classic Crash and burn reason) and engine hyrdolocking.

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Are there any faults in the Jeep AW4 transmission?