Transmission TECH/TALK Archives - Page 23 of 25 - Transmission Digest
June 2002 Issue

Issue Summary:

This month we cover an interesting situation in 1999 and later Mercury Cougars that can be caused by a defective radio.

Persistent codes for throttle-position and/or vehicle-speed sensor on Nissan Quest/Mercury Villager can be caused by lower engine mounts.

A number of factors can cause a shuttle-shift complaint in RE units behind 5.9-liter diesel engines that cycle in and out of lockup at highway speed.

May 2002 Issue

Issue Summary:

Harsh reverse engagement in Volvo AW50-42LE can have four possible causes.

Chrysler RWD units may experience repeated failures from meltdown of the front quick-disconnect line clips. Replace the quick-disconnect fittings with threaded fittings that will not melt.

Revisions have been made to the valve body and spacer plate on Ford AODE/4R70W.

Transmission-fluid leak from the vent in a 4T65-E can be prevented by replacing the upper-channel-plate cover gasket with an updated gasket.

A stator support turned inside the cover of a ZF-5HP-18 in a BMW can cause no power on take-off, neutralizing, bind-ups and failsafe.

Check for a defective mass-air-flow sensor in AX4S/N, AODE/4R70W and E4OD with converter-clutch shuttle.

April 2002 Issue

Issue Summary:

This month’s issue deals with code-retrieval methods on the Isuzu NPR/GMC Forward Tiltmaster for model years 1988 to 2000.

March 2002 Issue

Issue Summary:

This month’s issue features a number of charts that will lead you through the inner workings of this ZF transmission manufactured in Germany: BMW ZF-5HP-19FL.

February 2002 Issue

This month’s issue deals with 1992 and later Ford trucks that are equipped with LCD (liquid crystal display) odometers and experience intermittent or continuous loss of vehicle-speed signal.

January 2002 Issue

Issue Summary:

Mismatching wires of the turbine-shaft-speed sensor on Mazda 929 R4A-EL can cause major headaches.

A timing problem can cause delayed reverse in an E4OD.

In some two-wheel-drive Ford pickups with the E4OD transmission, stacked upshifts can result from the use of a 4×4 wiring harness.

We have information on the new A350 unit in the Lexus GS 300.

Incorrect drive and/or driven sprockets can cause gear-ratio errors in Ford AXODE/AX4S/AX4N units.

December 2001 Issue

Issue Summary:

In a Nissan RE4FO4A or Villager 4F20E, slipping or no second gear may be caused by insufficient spring tension on the 1-2 accumulator piston or a stuck 1-2 accumulator regulator valve.

We have in-depth information on retrieval of diagnostic trouble codes for Nissan vehicles.

Harsh upshifts on electronically controlled Nissan transmissions may be caused by a faulty dropping resistor or a poor connection at the resistor.

In Toyota Previas with four-cylinder engines and A46DE transmissions, stacked shifts or no passing gear may be caused by a broken wiring harness or faulty throttle-position sensor.

GM introduced a new-design overrun roller clutch into the THM 4L80-E as a running change beginning in March 2001. We cover the parts affected by this engineering change.

November 2001 Issue

Issue Summary:

n Acura Legends with G4, L5 & PL5X transaxles, grinding or bind-up in reverse could be caused by incompatible reverse-selector components on the countershaft.

In the BMW ZF-5HP-18, a bind-up with the selector in Manual 2 position, 1st gear, could be caused by a broken D-clutch one-way checkvalve assembly.

A broken clutch-pressure-control spring may cause flared or harsh upshifts on Honda A4RA/B4RA.

We also illustrate Ford CD4E air-check passages.

In 1996-98 Ford E4OD or 4R100, slipping or no reverse and/or no engine braking in Manual 1 or 2 can be caused by a misplaced BS1 checkball.

In earlier E4OD models, slipping or no reverse or no engine braking in Manual 1 or 2 can be caused by misplaced BS1 and BS6 checkballs.

October 2001 Issue

Issue Summary:

1997-2000 Ford F-150/F-250 pickups with 4R70W transmissions may have driveline vibration and rear-seal leaks.

Cooler leaks on 2000-01 Ford Explorer/Mercury Mountaineer four-door vehicles with 5R55W transmissions may be caused by contaminants on the cooler tubes.

On 2000 Cadillac Devilles, Eldorados and Sevilles and 2001 Oldsmobile Auroras with 4T80-E transaxles, slipping in fourth or no fourth gear with code P0734 may be caused by a warped lower-control valve-body channel plate.

No movement or delayed engagement in a BMW with the ZF-5HP-18 may be caused by a shrunken bypass ball.

We have furnished typical relay checks for Chrysler’s 41TE, 42LE and 42RE transmissions. Once the operation of a relay is understood, any relay can be checked with ease.

September 2001 Issue

Issue Summary:

This month’s issue covers a variety of complaints on Mercedes Benz vehicles, including harsh reverse or delayed reverse engagement in 722.3, 722.4 & 722.5 units, and slipping on take-off on models equipped with the rear-pump-elimination kit.

In AX4S/AXODE units, solenoid-wire connectors installed on the wrong solenoids may cause harsh shifts, a clicking noise and tie-up on shifts.

We have listed the vehicle-harness repair kits that are available for several different Ford transmissions.

Failure of the exhaust-brake system on Isuzu NPR/GMC Forward Tiltmaster vehicles could be caused by elevated line pressure and premature transmission failure.

August 2001 Issue

Issue Summary:

In the General Motors THM 4L80-E/4L80-EHD, no converter clutch, trouble code 68 in Overdrive and trouble code 39 in Drive 3 may be caused by an incorrectly installed TCC enable valve.

A blown fuse in 1991-95 Cadillacs equipped with the THM 4T60-E can cause 3rd-gear starts before or after overhaul.

In Saturn MP6/MP7 units, delayed or harsh reverse engagement and repeat failures of the external filter seal may be caused by a broken spring or bore wear.

The new center support for the Ford A4LD will retrofit as long as the new selective No. 4 and No. 3 thrust bearings are used.

July 2001 Issue

Issue Summary:

General Motors’ new-design pump-and-rotor assembly for 1994 and up 4T60-E models must be used with the tapered rotor because of some passage changes in the pump.

We have information on retrieval of Nissan diagnostic trouble codes – how to receive the signal from the A/T control unit and to indicate a detected fault by illuminating the malfunction indicator lamp (MIL).

General Motors has new-design solenoids for the 4T80-E, so we are showing the ways to identify them. Previous-design solenoids no longer are available.

Bind-up in reverse and 3rd and/or wrong-gear starts in the Ford 5R55E may be caused by a crack in the inner race for the center-support caged needle bearing.