Question about 2001 Land Rover Discovery Series II

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2001 LR Disco seems to have electrical issue

Hi. My 2001 Disco has its service engine light on. Worked with a former LR tech in the area. He got a huge fault list and recommended replacing the mass air flow sensor based on his experience.

We did that, but the light came right back on ($200). Next took it to dealer, who noticed a fried fuse and a bent pin on the MAF sensor connector. Repaired both, sent it home. Next day, problem recurred ($200 more).

Currently fuse 2 and fuse 5 in the engine compartment box are out. Fuse 2 (15A) connects to the MAF sensor, air injection valve, purge control valve, camshaft position sensor, and each of those connect to the ECM (explains the long fault list!). Fuse 5 (40A) goes to the motor cooling fan only. (Bought the circuit diagrams. $14. :-)

So this seems like there's got to be an electrical short, right? Advice on how to pinpoint it??

I did notice one of the black plastic "conduit" tubes adjacent to the top of the motor has cracked and come apart, exposing the wiring, but didn't see any fraying there.

Thanks in advance for any troubleshooting advice!

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No guarantee but ran into a similar situation once. Came to be the PCM itself was the problem.

Posted on Jun 19, 2009


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