05-06-2020, 11:07 AM
With everything you've done so far I'm assuming you've got access to ECU pin data & wiring diagrams? As far as I can tell you can only go as far with testing without either PP or sending off the ECU.
Pin 8 on the immobiliser is connected to pin 3 on the double relay & pin 34 on the ECU. In Autodata though, the info for testing the immobiliser only mentions Pins 22 & 35 on the ECU, and it doesn't give any test data for pin 22. Pin 35 should have 11-14v with ignition on.
You could bypass the double relay to get the fuel pump running but I assume if it is an immobiliser issue the ECU won't control other items like injectors & the coil. Tbh though, I don't think I've ever seen anyone definitively state which signals from the ECU are supressed in a locked ECU, so I have no idea really.
The crankshaft position sensor connects to pins 11&30 on the ECU if you want to test the integrity of the wiring. On the sensor itself you should get 300-400 ohms across pins 1 & 2. The same pins should give 1 - 4 v ac fluctuating voltage with the engine turning over.
If you get to the point of wanting to send off the ECU for testing (& if necessary unlocking) & would consider sending it to the UK , I've found these guys to be very good. https://www.cartechelectronics.com/. They also have unlocked ECU's for sale, although they really aren't cheap. The 0 261 204 652 was for the slightly later XU10J4R (with 200cc injectors & plastic valve covers). The earlier version with 186cc injectors (& alloy valve covers) was Bosch number 0 261 204 689. (Weirdly the earlier one had the higher serial number!).
Just looking again at the wiring diagram, I am wondering if pin 3 on the double relay is a power out to the immobiliser & the ECU (pin 34) via pin 2 on the double relay?
There's also a connection between the engine check light on the dash (illuminated at ignition on), pin 9 on the immobiliser & pin 22 on the ECU. Power to the dash check light comes from fuse 2 (5 amp).
Are you getting an angine check light illuminated with ignition on?
Pin 8 on the immobiliser is connected to pin 3 on the double relay & pin 34 on the ECU. In Autodata though, the info for testing the immobiliser only mentions Pins 22 & 35 on the ECU, and it doesn't give any test data for pin 22. Pin 35 should have 11-14v with ignition on.
You could bypass the double relay to get the fuel pump running but I assume if it is an immobiliser issue the ECU won't control other items like injectors & the coil. Tbh though, I don't think I've ever seen anyone definitively state which signals from the ECU are supressed in a locked ECU, so I have no idea really.
The crankshaft position sensor connects to pins 11&30 on the ECU if you want to test the integrity of the wiring. On the sensor itself you should get 300-400 ohms across pins 1 & 2. The same pins should give 1 - 4 v ac fluctuating voltage with the engine turning over.
If you get to the point of wanting to send off the ECU for testing (& if necessary unlocking) & would consider sending it to the UK , I've found these guys to be very good. https://www.cartechelectronics.com/. They also have unlocked ECU's for sale, although they really aren't cheap. The 0 261 204 652 was for the slightly later XU10J4R (with 200cc injectors & plastic valve covers). The earlier version with 186cc injectors (& alloy valve covers) was Bosch number 0 261 204 689. (Weirdly the earlier one had the higher serial number!).
Just looking again at the wiring diagram, I am wondering if pin 3 on the double relay is a power out to the immobiliser & the ECU (pin 34) via pin 2 on the double relay?
There's also a connection between the engine check light on the dash (illuminated at ignition on), pin 9 on the immobiliser & pin 22 on the ECU. Power to the dash check light comes from fuse 2 (5 amp).
Are you getting an angine check light illuminated with ignition on?