Welcome to RV Shifters.com

A service of Transmission Insturments

Your source for 'Better Than New' Rebuilt Electronic Shifter Modules for Allison Automatic Transmissions.

We cater to RVs, Coaches, Buses and Heavy trucks.

Are you a commercial dealer or repair person? Please click to www.transmissioninstruments.com

 

 

 

        New Shifter

Common problems we fix:

Shifter display will blink few times or is out, especially  when ambient temperature is cold. If this happens, try to read diagnostic codes from your ECU when display is ON.

If you see code 69-32, problem is ECU [transmission computer]. Often with this code you will read additional codes like 22-16 [faulty output speed sensor or connection], 22-14 [faulty engine speed sensor], 21-12 [faulty throttle position sensor], 23-12 [faulty primary shift selector link]. But in reality you most likely have no problem with sensor or link fault. Those additional codes can be misleading.

How to read ECU diagnostic Codes:

Turn on ignition and press the Up and Down arrow keys at the SAME TIME for one second, then release. Your shifter should display that it is in Diagnostic Mode 1 as seen on the left. [d-1] following 4 digit code. If you see O-L [oil reading], press arrows one more time. To read additional codes press MODE button momentarily. The ECU can store up to five codes [d-5]. If you see 2 dashes, there are no stored codes in the ECU.


Things to try when all else fails. [Dead ECU - No display, Vehicle won't start].
Its been noted that warming the ECU can sometimes help. Heating the ECU with hair dryer for several minutes can occasionally bring the unit back to life. If it works, you will be also able read diagnostic codes, and ECU's self-heating may keep you going until the vehicle is switched off and cools again. By this time, though, your way overdue for repairs.

If the engine starts but the shifter is unresponsive, sometimes starting the engine while holding the D or R shifter buttons simultaneously will work.

WARNING

Keep in mind, you're starting a vehicle that may lurch when the engine catches. Be sure to set your parking brake. Make sure there are no people or pets in the area and only perform this when you are certain you can safely attempt to start your engine this way. You do so at your own risk.


Often the shifter can be unresponsive when engine idle is higher - [check your RPM gauge - It should'nt be over 700 RPM]. This can happen also when the power train is cold. After the engine and transmission fluid will heats up, the shifter starts working normally.

Location of your ECU:
In most cases your ECU is directly under the shifter [mounted by 4 screws - do not remove those screws when removing ECU]. If your shifter is mount together with same size plastic gray box which have 9 pin 'horse shoe" shaped connector, your ECU will be located most likely near the transmission. Just look for the bundle of wires going out of transmission and this will lead you to the ECU.


Things to do before removing or replacing ECU:
Always disconnect the battery or turn off the battery switch [power train battery].  You don't need to remember which ECU connector is which, they are keyed to only fit one way.

 

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