Jaguar Repair Problems? Ask a Jaguar Repairs Expert.
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Right now can you communicate with all the modules using WDS? I assume the engine will not crank? Will the shifter release from park with the ignition on and foot on the brake?
Ok we need to fix that no comms with the ECM first. We may have a problem with the ECM relay or the ECM itself. The ECM will ground th EMS relay supplying itself with power. We need to check for voltage at fuses 37 and 38 in the engien comparment fuse box. The relay powers more fuses but if these do not have voltage on both sides then we know the relay is not being energized. The relay is R4 in that same fuse box. If voltage is present on those fuses then continue to test all the other fses for voltage just in case one is blown. Let me know.
Ok I will look back at the diagram. While I'm doing that out ids back on it to confirm we can communicate with all other modules except the ECM. Thanks.
Fuse #18 (20 amp) should definitely have power with the ignition on. That comes from the throttle relay. Remove the relay which is R5. Under it the pins should be numbered. Go to the corresponding pins on the relay socket connector and make sure we have battery voltage to pins 1 and 3. If we do jump pins 3 and 5 to see if we have power to the fuse.
That is what it looks like. If all the other fuses have power then it is either the ECM or wiring. Go to the 42 way block harness on the right side of the engine compartment and see if we have voltage with the ignition ON at pin 39 green/red as that is the trigger for the relay. If voltage is present then the ECM is not grounding the relay. We wil then need to confirm all powers, ground and the CAN network wires to the ECM. Also look for signs of water or corrosion in the ECM connector under the pollen filter housing.
OK no problem. Have a safe trip