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BTR shift control problem. 

 

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 Post subject: BTR shift control problem.
Posted: Sun Sep 28, 2008 7:22 pm 
Getting Side Ways
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Age: 50

Posts: 480

Joined: 10th Feb 2005

Gallery: 28 images

Ride: EF Fairmont Station Wagon.

Power: 150 rwkw

Location: Mandurah
WA, Australia

Hey guy's, I have been having problems with my auto after replacing a trip computer (clock wasn't working). I have reset the base idle and checked the TPS values at the ECU and the TPS module and all are within spec, also checked the gear selector switch in all positions and all were in spec. Then I checked the vehicle speed sensor and all good apart from one reading between the positive and sensor wire got 0.04v should have been approx 8.5v, so I investigated further.
This is what I did. The Gregorys book says to check the sensor and positive wire at the speed sensor connector at the gearbox, unplugged with the key on this is how I got the 0.04v which should be approx 8.5v. I have traced these two wires back to the ECU and got 11.4v at the ECU, then checked the voltage for the same wires that go into the cluster at the plug, unplugged and key on and got 11.2v. I then checked the coresponding wires that come out of the plug after going through the cluster and go to the speed sensor plug and got the same low reading as checking how the gregorys book says. I get 8.7v (should be approx 8.5v) from the power wire at the speed sensor connector earthing back to the chassis. I assume this means a problem with the cluster, does this make any sense at all, and where do I go from here.

 

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4.0L EF Fairmont Station Wagon. EL GT Snorkel. K&N Pod in air box. 3" Intake piping.
Home port job. 1636 Wade cam. Wildcat Extractors, 2 1/2" cat and exhaust.
2200/2400rpm Dominator More Stall. Stage two mechanical shift kit. 3.73 4 pinion LSD. 15.078 @ 92mph.

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Posted: Sun Sep 28, 2008 10:12 pm 
Getting Side Ways
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Age: 50

Posts: 480

Joined: 10th Feb 2005

Gallery: 28 images

Ride: EF Fairmont Station Wagon.

Power: 150 rwkw

Location: Mandurah
WA, Australia

Suppose I should have said what the problem is with the auto, It's holding on in first you can keep building the rev's and it wont change up, back of the accelerator a bit and it will change into second, well I think it's second because it wont change up any more and I can sit on 100kmh but I am doing 3200rpm. The auto before fitting the trip computer was spot on thats why I am thinking it is an electrical control problem.

 

_________________

4.0L EF Fairmont Station Wagon. EL GT Snorkel. K&N Pod in air box. 3" Intake piping.
Home port job. 1636 Wade cam. Wildcat Extractors, 2 1/2" cat and exhaust.
2200/2400rpm Dominator More Stall. Stage two mechanical shift kit. 3.73 4 pinion LSD. 15.078 @ 92mph.

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Posted: Mon Sep 29, 2008 5:58 pm 
Stock as a Rock
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Joined: 4th Jun 2006

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Location: Palmerston North
Oustide Australia

hey there, I'm sort of having a similar problem, although I can't hold any gear...drive or bust for me...are you able to post any pictures from your gregorys manual?

I'm getting the right voltages at my gear selector and I have replaced the inhibitor switch...I'm leading to believe that I have a buggered wire somewhere.
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Posted: Wed Oct 01, 2008 12:36 am 
Getting Side Ways
Offline
User avatar

Age: 50

Posts: 480

Joined: 10th Feb 2005

Gallery: 28 images

Ride: EF Fairmont Station Wagon.

Power: 150 rwkw

Location: Mandurah
WA, Australia

Sorry man havn't got the computer skills or working scanner to put the pages up.

 

_________________

4.0L EF Fairmont Station Wagon. EL GT Snorkel. K&N Pod in air box. 3" Intake piping.
Home port job. 1636 Wade cam. Wildcat Extractors, 2 1/2" cat and exhaust.
2200/2400rpm Dominator More Stall. Stage two mechanical shift kit. 3.73 4 pinion LSD. 15.078 @ 92mph.

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