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Troubleshooting dead injectors 700 1987

posted by  B.B. on  Fri Nov 30 11:26 CST 2007
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last visit: Mon Oct 6 13:15 CST 2014
[RELATED]



the ground return for the injectors is switched by the computer?

You'll have to see 12VDC between two of the pins at the injectors and NOT
between the +12v pin and the chassis ground. Thus the presence of +12V
isn't enough to drive the injectors, gotta have the ground too.

In the 89 740 you can measure at the "Right Wheelhouse 8 pin connector
pins 7 Gnd (Green wire) and pin 6 (Green/Red wire) +12V
If you get in there with a meter, you can save a lot of expensive
guesswork.

This connector is inside the engine compartment near the firewall on the passenger side.

You can avoid painfull troubleshooting migraines by getting the Volvo
wiring greenbook for your carl.

Post back with your results.

Bill






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