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CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
did you bypass ballast resistor ? check for current at pump when key gets turned ?
Last edited by freegdr; Sep 9, 2012 at 10:50 AM.
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Aw geez. Well, its about as easy to check the CPS as it is to check for spark. Also these need to crank pretty well btw. Below something like 300 RPM, it aint gonna happen. So check for spark or:
AC voltage CPS test; Small clips on the meter leads really helps.
Unplug the connector at the back of the manifold with wires going down to the bell-housing/cps.
Probe the two wires to the cps with the meter set on AC volts. (a 200 scale on mine).
Crank the engine and note the voltage. (jump it if your battery is low)
Mine somehow works with only .3 my wiring/grounds must be pretty spiffy. .5 seems to be a good mark. One article talked of .5 to .8. **Update, it soon failed. I installed Napa #css980 in my 90.**
AC voltage CPS test; Small clips on the meter leads really helps.
Unplug the connector at the back of the manifold with wires going down to the bell-housing/cps.
Probe the two wires to the cps with the meter set on AC volts. (a 200 scale on mine).
Crank the engine and note the voltage. (jump it if your battery is low)
Mine somehow works with only .3 my wiring/grounds must be pretty spiffy. .5 seems to be a good mark. One article talked of .5 to .8. **Update, it soon failed. I installed Napa #css980 in my 90.**
Thread Starter
CF Veteran
Joined: Dec 2010
Posts: 2,366
Likes: 0
From: Spanish Fork, Utah
Year: 1989
Model: Cherokee
Engine: Renix 4.0L
Originally Posted by freegdr
did you bypass ballast resistor ? check for current at pump when key gets turned ?
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