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Leganza2.2L Auto.Won't shift 1st,2,3,4 in D only?

Transmissions, Clutches, torque converters, Gear ratios, Brakes, Pads, etc.

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Leganza2.2L Auto.Won't shift 1st,2,3,4 in D only?

Postby lobe » Mon Sep 26, 2011 6:19 am

Hi,

******* Update 4.10.11 - trans valve cover removed & shift solenoids checked. All operate ok. All ok with resistance check. Wiring harness inside trans checked for continuity - all ok.
Continuity from TCM pin 11, to OBD/DLC pin 2 all ok. Ok from tcm pin 11 to ECU pin B13 ( serial data link between tcm/ecu ).

Note transmission is actually capable of getting 4th gear - by disconnecting trans computer completely - i.e then it has obviously gone into limp mode (L holds 1st, 3 & D hold 4th)
Only fault code when read with snap on OBD is U3F00 ???, it just re apppears when cleared ???

*********

Daewoo Leganza Oct 2001 2.2L Auto. Autralian model. Transmission won't shift from 1st when shifter is placed in 'D' ( can be operated like a semi auto so is drivable - see last couple of paragraphs )

The auto gearbox ( Aisin Warner 50-40 model ) will not shift out of 1st into 2nd, 3rd, 4th in D. This problem occurred after girlfriends 15min drive on the motorway/freeway, after exiting on the down ramp & coming to an intersection, then wouldn’t change out of 1st. I picked the car up 3hrs later, disconnected battery for 5mins, checked trans oil level after warm up, then drove car. Wouldn’t shift from 1st.
Thrashed it abit in 1st round near top of rev range and it shifted gears. Auto trans working again. After 15 min drive back down freeway, same problem.

Check Engine Light (CEL) had been on for ages prior to fault ( suspected cam sensor ) so difficult to say when a suspected transmission fault problem occurred, other than physical problem of it failing to shift from 1st.
The ATF oil was not burnt but i flushed it anyway, inc disconnecting cooler line to empty torque converter of old oil etc.
Replaced with new ATF. Still the same problems - stuck in 1st gear, accelerating high into rev range in car caused it to shift again, but after brief drive at highway speed, transmission would stick in 1st at 1st opportunity i.e when exiting highway/slowing down at intersection etc.
Accelerating quite high into rev range causing car to then shift gears only worked for say 3 – 4 times. Now non shift from 1st problem is cannot be cleared by just accerating high in rev range.

Scan showed fault codes - for cam sensor, crank sensor & park neutral switch (in memory from older problem, since replaced).
1. Cam, crank sensors replaced. Park neutral switch disassembled and checked - ok.
2. ECU/ TCM (trans control module) wiring checked, connections etc.
3. Batt disconnected for a few hours to clear ECU. CEL still on. Problem still persisted

4. Disconnect batt. Clear ECU. Fit 2nd hand TCM (transmission computer) , SOME SUCCESS – no CEL on. Suspect this has been cause of CEL been on for ages. Transmission still won’t shift in D.
5. Tried 2nd hand ECU with no success - transmission still won’t shift in D.
6. Park neutral switch disassembled and checked - ok.
7. Check gear shift cable and adjustment, park neutral switch setting – all ok.
8. Although there were no throttle position sensor fault codes - i disconnected sensor to check if CEL light came on. It came on immediately. Reconnected TPS & cleared ECU.
9. Visually inspect wiring to park neutral switch, gearbox temp sensor – all appear ok.
10. Vehicle speed sensor appears Ok, as speedo is working ok.

Note : The vehicle speed sensor did fail about 3 months prior to trans shift problem, resulting in speedo not working. Transmission still worked as normal. Sensor had failed mechanically. Replaced with brand new OEM part. Speedo worked again.

The car can be still driven, by using the following method, to allow it to shift like a semi auto, as per owners manual.
1a) pressing the hold button down on the gearbox, put gear/shift lever into the # L position - gearbox holds 1st only.
2b) Move gear/shift lever into #3 position - gearbox then shifts and holds 2nd gear only.
3c) Move gear/shift into D - gearbox then shifts and holds 3rd gear only.

This method is ok but obviously doesn’t shift into 4th when in D and hence not suitable for motorway, highway driving etc.

Next suspect is to drop pan & inspect for solenoid short on wiring, check resistance etc. If solenoids are at fault, why do the gears still shift as per above method outlined in 1a, 2b, 3c ???

Any ideas, help would be appreciated
Thanks.
lobe
 
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Joined: Mon Sep 26, 2011 6:00 am

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