HI John
Sorry to hear that the problem is still on going. Below is a list of all the Ford PATS immobiliser system fault codes I am aware of. These are the codes displayed by the immobiliser light flashes. As a reminder, if the immobiliser light flashes rapidly and the car will not start leave the ignition on and after about a minuet the light goes out and then flashes the code.

I know the following to be true on my car because I have tested this on my ECU test rig. My car is a 1999 4/4 fitted with a ford 1.8 ltr silver top ZETEC petrol engine and a Ford EEC IV ECU/PCM. The only components involved in the immobiliser are the ECU and the ignition barrel coil key reader unit. Some cars have a module between the ECU and the Key Reader and sometimes this can be incorporated in the instrument cluster.

For those interested a brief description of the sequence of events is as follows:
When the ignition key is turned on power is applied to the key reader unit and the PCM. The PCM sends a 50ms charge up pulse to the key reader unit. The charge up frequency coupled from the key reader unit to the key via the coils, one in the unit and one in the key is 134.2 Khz. This charges the key transponder embedder in the plastic part of the key. When the pulse stops the key uses the charged up energy to transmit the key code to the reader unit via the coils. The code is a digital packet of ones and zeros. The modulation used is called FSK (frequency shift keyed). The two frequencies used for the two digital states are 134.2 Khz and 123.2 Khz. The code is passed on to the PCM from the key reader. The PCM compares the code to a list of key codes stored in EEPROM Memory. If there is a match all is well if not the PCM does not energize the fuel pump relay so no fuel and does not send out pulses to the ignition coil pack so no ignition sparks.

Hope all this waffle helps but do bear in mind your system may be different but I would have thought that it's worth leaving the ignition on whilst the emmo light is flashing rapidly for a minuet or two to see if you get any codes..






CODE MEANING

11 No connection between module and transceiver coil

1. Check transceiver coil and wiring condition.
2. Check engine ECU multi-plug connection.

12 No Data received from lock barrel pick up.

1. Check key has not lost micro chip.
2. Try spare key
3. Check transceiver coil and wiring condition
4. Remove metal objects from key ring.
5. Immobiliser control unit faulty.

13 No code received.

1. Check key has not lost micro chip.
2. Try spare key.
3. Check tranceiver coil and wiring condition.
4. Remove metal objects from key ring.

14 Incomplete key code

1. Check key has not lost micro chip.
2. Try spare key.
3. Check transceiver coil and wiring condition.
4. Remove metal objects from key ring.

15 Incorrect key

1. Key needs to be programmed to vehicle.

16 No data between modules

1. Check wiring and connectors between ECU and PATS module.

21 Less than three key codes stored

1. 3 keys must be programmed to system.

22 No data between modules.
1. Check wiring and connectors between ECU and PATS module.
2. Check wiring and connectors to diesel pump.
3. Immobiliser control unit faulty.

23 Data mismatch between PCM and Instrument Cluster.

1. Requires reprogramming.

31 Incorrect code to diesel smart module.

1. Check wiring and connectors to diesel pump
2. Check wiring and connectors between ECU and PATS module.
3. ECU programming error.

32 No connection to diesel smart module.

1. Check wiring and connectors to diesel pump.
2. Immobiliser control unit faulty.
3. Wiring connector fault on immobiliser control unit.

33 Bad connections to diesel smart module

1. Check wiring and connectors to diesel pump
2. ECU or immobiliser control unit faulty.