VS Executive wagon not starting and only code is 92

[pjdm1980]

A mate has just brought a VS Executive wagon was going fine for a couple of days then just stopped (cranks and gets a fire every once in a while but won't start), so I ran a code check and came back with Code 92 - Low Speed Radiator fan response signal but it would seem that the code is from a mod to the thermo fans and I don't think it is the cause so here is a list of parts that have been replaced
- Battery
- Coil packs
- DFI
- CAS
- Engine computer
- Balancer
- Air flow sensor
- Temp sensor
- Fuel pump
- Fuel filter
as it sits the fuel pump works when key is turned on all the fuses are fine but it does this strange thing that I've never seen on a Executive and that's when you turn the ignition on the indicators flash until you press the unlock button on the key but as far as I know the car should start as it has the sensor on the key, and has a weak injector signal pulse but has good spark?
The only thing that looks weird is some on has used the power window fuse and regulator and marked it hot wire (WTF?) but none of this had been touched.
Any ideas sorry for long post but it's been going on for a couple of days know and starting to wear thin?

[hako]

Sounds like your car may have some sort of aftermarket immobiliser fitted or partially removed. That will need a lot of searching/testing of wires to find. May also be a bad Key reader ring - the shiny ring thing where the ignition key fits in the keyhole...it makes contact with the tit on the keyhead to tell the BCM that it's OK to start the car...if bad it will prevent the car starting by killing the injector pulse from memory.

[pjdm1980]

Sounds like your car may have some sort of aftermarket immobiliser fitted or partially removed. That will need a lot of searching/testing of wires to find.

Maybe but i hope not!

May also be a bad Key reader ring - the shiny ring thing where the ignition key fits in the keyhole...it makes contact with the tit on the keyhead to tell the BCM that it's OK to start the car...if bad it will prevent the car starting by killing the injector pulse from memory.

Already tried that as well.
Cheers Pat

[Brett_jjj]

A bad/faulty ignition key fob or key reader will stop the car from even attempting to wind over,just like when you try to start an automatic car in gear..

[BlackVXGTS]

DTC 92 V6 PCM
LOW SPEED FAN NO BCM RESPONSE
The PCM determines operation of the two speed engine cooling fan based on A/C request signal input, engine coolant temperature, and vehicle speed.
The engine cooling fan low speed relay (labelled LO FAN in relay housing) is energised by the BCM. When the PCM determines that the engine cooling fan low speed relay should be turned ON, the PCM will send a message on circuit 1221 to the BCM. This message will ask the BCM to earth circuit 473 and energise the engine cooling fan low speed relay. After the BCM provides the earth for circuit 473, the BCM will send a message back to the PCM saying that the earth circuit was commanded. The DTC 92 will set if the PCM sends out the message to the BCM to turn ON the engine cooling fan low speed relay and the BCM does NOT send a message back to the PCM.
An open or short to earth on circuit 1221 will disable any communication of serial data between the PCM and BCM.
Diagnostic Aids:
Dirty, Damaged, or Loose Connections or Damaged Harness - Check for any damage to the harness which could cause an intermittent open or short to earth or backed out terminals at the BCM module connectors, broken locks, improperly formed or damaged terminals.
The engine will not start if circuit 1221 is open or earthed. Therefore if DTC 92 is set and the engine will start, DTC 92 is intermittent. Review DTC history data to determine when DTC 92 set.

Circuit Description:

[pjdm1980]

Interesting so maybe I'll have to have a look at the dodgy fan wiring tomorrow!