V6 Engine Wiring Diagram

Hi all,



My sisters 2005 ZT 190 2.5 V6 is constantly flagging "lean bank 1" errors. I have replaced the lambda sensors with spares to rule out the sensors obviously. The sensors are not the issue.



With a live scanner connected I have happy readings from the bank 2 sensor (jumping up and down fine), but just a flat line from the front sensor, despite connecting spares and testing the signal etc - nothing ever gets the flat-line to move.



The next step was to compare the working sensor connector (bank 2) with the faulty connector (bank 1) to see if there was a difference in the pin-out readings - suggesting a short, broken wire or similar. The results: One of the 4 pins gave a different reading. At one end (the curved end) of the GOOD Bank 2 connector, I have a 11.8v reading to earth (positive terminal of the tester on battery live), whilst on the faulty connector (Bank 1) I get a 6.8v reading to earth.



This is likely my problem and it's time to dig through the engine wiring harness diagram - but I don't have one.



My manuals include all the other diagrams but do not have an engine diagram.



Could someone please provide me with a diagram for the engine harness from a V6 75/ZT please - the diagram needs to be the one to include the Lambda sensors obviously.



The wire I need to check is Blue/Yellow



Thanks all.



Mick

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