Checking Fuel Injector Resistance - 1990-1996 Q45
Checking Fuel Injector Resistance
Update: On 1990-1994 Q45s, you should close all
doors, remove the key, and make sure nothing is plugged into any 12v
sockets to get an accurate reading.
On 1995 and later Q45s, you may need to turn the key to "on" because the
injectors are on switched power.
Normally you want to check the
injector resistance when the plenum is off.
However, when you are diagnosing a possible injector failure this
isnít always recommended.
You must first unplug the injector harness.
It is shown here:
blue arrow points to the correct harness connector.
Depending if you have a California or Federal model, you may not
have the same amount of connectors so the picture wont be the same, but
it should be close enough.
you do is unhook the connector. Once
you do that, you want to test the side with the pins.
Attach the POSITIVE probe of your meter to the positive post on
the battery. Then, take the
negative probe and put it on the individual pins.
outís as they are on the injector harness as you face it
See the two photos below contributed kindly by Mike Goodwin:
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