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[JONNYWAKEY]

Guys, following on from all of the problems I am having with Limp mode etc, I have decided to change both the cam sensor (again) and crank sensor, dont think its the Pressure Solonoid as surely this would be a permanent fault and not intermittant.

Does anyone know an easier way of removing / fitting a new crank sensor as its in a real pig of a place, seems like the aircon pump has to come off in order to gain access?

Also does anyone have EPC in order to confirm part number?

many thanks

Jonny

[TheBoy]

Hmm, why shouldn't the pressure solenoid be intermittent?  When the codes were read, did it say this code was Present, Not Present, or Intermittent?

If the gearbox detects a fault, it will send a msg to engine to go to reduced power (ie engine limp).

[JONNYWAKEY]

Im sure it said Present or Stored, cant remember!

Solenoid is a real pain to change as its in the intermediate housing!  thought a used low mileage guranteed box would be a better option.

My local mechanic feels that the     Code represents a faulty cam and or crank sensor as the ecu and gearbox ecu aren't seeing the correct engine speeds, thus gearchange is erratic and box thinks solenoid is faulty, he has had this problem on his pre-facelift 2.0l Omega and feels that new crank sensor is at fault!

This is causing me major headache as I need to know which course of action to take.

As I was instructed I am changing the sensors first to see what faults I am presented with once these have been renewed!

Hopefully pressure solenoid fault will go away? if not then will get a low mileage used box and use it for spares, its cheaper than paying £300 for the solenoid.

Cheers

Jonny

[TheBoy]

Im sure it said Present or Stored, cant remember!

Solenoid is a real pain to change as its in the intermediate housing!  thought a used low mileage guranteed box would be a better option.

My local mechanic feels that the     Code represents a faulty cam and or crank sensor as the ecu and gearbox ecu aren't seeing the correct engine speeds, thus gearchange is erratic and box thinks solenoid is faulty, he has had this problem on his pre-facelift 2.0l Omega and feels that new crank sensor is at fault!

This is causing me major headache as I need to know which course of action to take.

As I was instructed I am changing the sensors first to see what faults I am presented with once these have been renewed!

Hopefully pressure solenoid fault will go away? if not then will get a low mileage used box and use it for spares, its cheaper than paying £300 for the solenoid.

Cheers

Jonny

If the Pressure Solenoid was Present or Intermittent, I would agree with the electronic diagnosis this time.  To store this code, the ECU has noticed a problem with the solenoid (either it hasn't actuated, or is pulling over/under current).

If it was an engine rpm signal issue, thats a different gearbox code - P0725 (or similar)

[JONNYWAKEY]

fault reports from my code reading software as follows:-

Fault code report
 
Date 17 May 2007       Time 17:52:14

 
Connection details
Module      Transmission

 
Fault codes
Fault code      Code type      Definition
P0748      Stored      Pressure Control Solenoid A Electrical
P0727      Stored      Engine Speed Input Circuit No Signal
P1781      Stored      CAN data bus, ECM actual torque signal - malfunction detected
P1740      Stored      AT torque control, signal - malfunction


Fault code report
 
Date 15 May 2007       Time 18:05:31

 
Connection details
Module      Engine

 
Fault codes
Fault code      Code type      Definition
P0340      Stored      Camshaft Position Sensor A Circuit Malfunction (Bank 1 or Single Sensor)
P1700      Stored      Multiple definitions available:
            Transmission control module (TCM) - service request signal
            Transmission control module (TCM) - MIL request - malfunction
P0700      Stored      Transmission Control System Malfunction (MIL Request)
              

[TheBoy]

Where those 'stored' codes cleared successfully, and what codes have now returned?

[JONNYWAKEY]

stored codes were cleared, however after driving, the majority of them return, mainly the pressure solenoid and engine speed no input signal, plus the usual P0700 & P1700

[TheBoy]

stored codes were cleared, however after driving, the majority of them return, mainly the pressure solenoid and engine speed no input signal, plus the usual P0700 & P1700

Hmmm, 0727 is a CAN error (as are the 0700 and 1700), but is related to rpm. As AA and TD will confirm, failing cam sensors do throw up a heap of CAN errors, so may be worth changing.  But also, the 0748 may be causing it.  This is where I would concentrate on, as it is likely a valid code.  There are some measurements you can do with a meter and a 21W bulb which will locate it to box ECU, wiring, or one of the solenoids.

 :-/

[JONNYWAKEY]

TB Thanks for the advice, I have followed the checking procedure on a useful piece of software that I have!

Followed Following: P0748 - Pressure Solenoid Circuit high input

K85 Trans control unit
Remove connector - done

Ignition on - done

T26 to ground > 11v          -  Yes - 12.14v

T6 to ground > 11v            -  No - 0.01V

Result

High transition resistance between:
K85 Control Unit - Automatic Transmission
Wiring harness connector (wiring harness side) terminal 6
&
Ground


?
Checking wiring now,

[JONNYWAKEY]

TB, dont know if this makes sense to you, a few weeks ago I had the EML on, I code read the car and the only fault displayed was a Misfire in Cylinder 1.

I took the advice from the forum and checked the plug wells, low and behold - full of oil.
I then removed oil and installed new rocker gasket, new coil pack and new plugs - fault cleared!

I didnt clean the area around the Cam sensor !

yesterday I was having a good look aroound the wiring, spent 2 hours checking and found no breaks etc.
I then noticed that the cam sensor well was caked in oil, I removed the cover from over the timing belt and removed the torqx bolt and then removed and cleaned the sensor!

I cleared all codes and car is starting better, running better - wifey been out all day in car and no sign (Fingers crossed) of EML or limp mode!

Hopefully as usual, you guys were right with Cam sensor all along, one thing I have noticed is that there is no part number on sensor and I remember it only costin £28  this leads me to think its a non-vauxhall part.

Will keep you updated on progress.

Thanks for your advice - top class as ever!

Cheers Jonny

[Auto Addict]

Result

Thanks for the feedback

[Marks DTM Calib]

I hate to say I told you so......but, I told you so...

The auto box gets quite a few bits of info from the engine ECU and feeds back a retard value for the shifting points....

[TheBoy]

Keep a regular eye on the 0727 code, see if it reoccurs....   ....I think the cam sensor was the limp you were getting, but still concerned over this code, as I think its valid.

Maybe its just that I am paranoid about autoboxes at the moment...