Z32 Auto Transmission stuck in 2

Hello All,
I am stuck in 2nd gear in Auto.
Transmission fluid all good.
If I drive manual Mode I can change from 2nd to 3rd
The day before this all changed it was driving perfect
Any ideas?

Bobby

 

Thank You Ryzan for your input

My next question to ALL in Perth
Do we have any recommendations for someone in Perth who can check out this Auto Trans ECU and if possible reprogram my ECU?

 

Great advice Ryzan

 

Yep ryzan, swapping in a known to be good ATCU would be the quickest way to diagnose it.
A couple of other DIY checks just occurred to me.

Does it have a rocker switch beside the T-bar shifter labelled, from top to bottom -
POWER, then AT on the actual switch, then HOLD at the bottom of the switch?
Try flicking that switch a few times in both directions.
I remember a Zed I worked on where the actual rocker part of the switch was cracked and not seating in the body of the switch, that auto was doing some strange things.

Also, shift solenoids inside the transmission can fail, so can the connectors that power them.
Try unplugging then re-plugging the connectors in the engine bay ( aka a Break & Make ) maybe spray them with cleaner too. Still no joy?

Check continuity of the solenoids at the engine bay connector using a multimeter.
Some suspect readings? There's another connector for the solenoids loom, it's attached near the trans.
You need to get under the car to check that one. It might need a break & make plus a spray clean.

Visually check the actual wiring loom as you go, and fondle it a bit. If you find hard crusty cooked sections of the sheathing that crumble as you squeeze them then the wiring inside might be compromised.

Sorry to be rambling folks, I'd rather be at a pub on a Friday night but you lot are my beer buddies for the moment