d22 zd30 start fault

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andyw

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Hi all , my 2006 D22 ZD30 will not start . Returned home , unpacked vehicle , an hour later went to start will crank over but not start . Checked fault codes , reading 0703 pump communication line . Will not clear . No previous problems . 147000 KM on the clock .Any hints besides new pump ? Thanks .
 

Old.Tony

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It's likely to have a Bosch VP44 fuel pump. Looks like there's a small electronic component inside the pump's control board that lets go which is the common cause of failure. But before we go throwing away the pump ...

If the engine hasn't even kicked, it'd be worth disconnecting the glows and popping a glow plug out after a couple of seconds' cranking and see if the plug's wet. If it's wet then you're getting fuel, while you have that glow out check the compression of that cylinder (then check all the others, writing down the figures - look for large variations between cylinders).

If the glow's not getting wet there are two possibilities: failed pump (common) or injector open commands aren't working (either the ECU isn't issuing them - timing fault? or the injector harness is loose/dirty/damaged.

It's worth going over the electrical connections to things like the crankcase/camshaft position sensors and all of the injectors - unplug them and plug 'em back in first, might just be some debris/oxidisation. Check battery connections (both terminals of the battery, and the connection to the engine block).

That's a start, anyway.
 

Horatius

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^ No electrical connections at the injectors on the zd30 afaik. They're the old fashioned type. If the wiring and plugs to the pump are ok, it's most likely a faulty pump, unfortunately.
 
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