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Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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T30 Automatic no 1st or 2nd gear


After almost 18 years I have my first real problem with the Xtrail.
Reverse works normal but when in Drive the Xtrail starts off very slow even though the revs are up at 3000rpm. Speed slowly increases and drives normally once in motion.

Diagnosing the problem further I find the transmission does not shift into 1st or 2nd gear and always starts off from rest the same way, as though it is stuck in 3rd gear.

So researching through the service manual I find there are 2 shift valve solenoids which control gear changes in the transmission. They both go through a combination of off/on changes to select a gear and I find looking through the table that if Shift solenoid B was not working then 1st and 2nd gear would never be selected.

This I think is my problem and I will check the wiring and solenoid resistance to see if it is bad before I take it to a transmission specialist for repair.

---
Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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14/Apr/2021, 8:42 am Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: T30 Automatic no 1st or 2nd gear


Well, on further investigation, there is no overdrive either.

I found on page AT-253 of the service manual, how to put the TCM into diagnostic mode to visualise flashes of the O/D lamp in the dash to show faults.
First problem is that the O/D lamp did not illuminate for the 2 secs indicated in the first step of the procedure. Found the main TCM 10A fuse was blown. So replaced it and the diagnostic sequence was done with no faults showing.

Then proceded to reverse out of the driveway and upon driving up the road, the fault was still there. Pulling back into the driveway and re-entering the TCM diagnostic mode showed the O/D lamp again failing to illuminate for the initial 2 secs so the fuse was blown again.

Further searching the power diagrams in the service manual showed that the reversing lamps are powered by the same fuse as the TCM. WHY ??? What seriously flawed piece of logic did Nissan use to come up with this idea ?

So now it is off to find out if it is the LED reversing lamps or the reversing sensor control box which is faulty causing the fuse to blow when put into reverse.

Atleast at this stage it seems the TCM and the mechanicals of the transmission might be fine.

---
Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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Nickelass Profile
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Date Registered: 02-2021
TOTAL POSTS: 79
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Re: T30 Automatic no 1st or 2nd gear


quote:

Further searching the power diagrams in the service manual showed that the reversing lamps are powered by the same fuse as the TCM. WHY ??? What seriously flawed piece of logic did Nissan use to come up with this idea ?



My old Volvo had a Bosch based mess of management systems. When the steering control model would intermittently loose connection with the sensors (due to minor hub play in one of the front wheels as I found out after months of trying everything), it would cause the ECU module to freak out. Then all the other modules would just freak out and then throw comms errors at each other. Trying to diagnose it took me months as the ECU would 'forget' the codes once the car was restarted. Naturally the fault never happened when the dealer had it under warranty for testing. So short of towing the car whilst it was running.... emoticon

Makes you wonder doesn't it. If the ECU costs over $1,000 new (seperate from the other Bosch computers in the car), surely they could insert 256k of solid state memory emoticon But most often than not, these systems are not actually made by the car manufacturer, rather the same component are used across brands.

Fingers crossed for you Revhead Kev. Keep digging, sounds to me you are on the right path.

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Nick
2010 ST (MY10). ** MODIFIED*** King lifted springs, Rear protection tray, Sony XAV-AX1000 headunit, CMD05 Command parking sensors, Garnish Mount reversing camera, Tow bar, Left side cargo drawer, ClicOn dash mobile mount
30/Apr/2021, 5:26 pm Link to this post Send Email PM   Send Private Message Blog
 
roid Profile
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Date Registered: 05-2017
TOTAL POSTS: 103
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Re: T30 Automatic no 1st or 2nd gear


Sorry to be so long to notice your post!

Defaulting to 3rd gear (limp mode) is often standard behaviour when a TCM notices a fault. (Could be different for Nissan though, what make is the transmission? Is is Aisan?).

Either way, the fault may be momentary, or ongoing once the car is warmed up.

A lot of the time it is a faulty fluid temperature sensor, as they go bad over time. So very easy to fix, usually its a matter of dropping the pan and R&R the sensor on the valve body.

Could be a solenoid too... again cheap to fix if you can get a set from a wreck and switch them over.

Did you do any of the following and try again?

- check the rear light circuit for shorts?
- replace LED bulbs with normal lamps?
- disconnect the rear light circuit and try again to see if the fuse blew? (not an ideal test to do, but...)

Maybe you got a fault code out, or got somewhere, somehow otherwise?

Certainly sounds like a short, and not just a snagged wire, I'd be more suspicious of the reverse light selector switch in case its broken internally and shorting momentarily when you shift.

Last edited by roid, 19/May/2021, 10:36 am


---
05 T30 ST-X Auto
205/75x16 A/Ts on 6.5" ET40
200k: Refreshed suspension,fuel, ignition & cooling systems
Often good & dirty as is lifted 35mm on Sachs Automatics & poly bushings
Northern Sydney, NSW
19/May/2021, 10:31 am Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
Reply | QUOTE
Re: T30 Automatic no 1st or 2nd gear


It turned out to be something in either the additional LED reversing lamps, reversing camera or reverse parking sensors. After disconnecting them and replacing the fuse the transmission is good and selects all gears.

As I mentioned in my last post, I do not understand why Nissan decided the reversing lamp circuit should be powered by the same fuse which supplies the TCM, but now people know to check the reversing circuit if they have the same limp mode problem and blown fuse.

---
Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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19/May/2021, 12:15 pm Link to this post Send Email PM   Send Private Message Blog
 
roid Profile
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Date Registered: 05-2017
TOTAL POSTS: 103
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Re: T30 Automatic no 1st or 2nd gear


That's good. First check is always any non-factory modifications emoticon

The T30 has no lamp control module AFAIK, so they just run a circuit where they want. I'm sure everyone would agree it is very bad form to run any body electricals on a circuit necessary to achieve or control motion on a vehicle.

If you have water ingress from a seal or a broken lamp, or a short from some other reason, even a minor rear end collision, the transmission goes into limp. Not the worst... but necessary!

Good to know though, thanks for sharing!

---
05 T30 ST-X Auto
205/75x16 A/Ts on 6.5" ET40
200k: Refreshed suspension,fuel, ignition & cooling systems
Often good & dirty as is lifted 35mm on Sachs Automatics & poly bushings
Northern Sydney, NSW
19/May/2021, 12:36 pm Link to this post Send Email PM   Send Private Message Blog
 


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