Question about 2004 Jeep Grand Cherokee
P1294 WHAT ENGINE?
target idle not reached, (means idle is wrong)
4.0L or 4.7L
means the ISC was changed by the PCM (commanded) and the ISC
failed to adjust idle to the correct speed.
clean the throttle bore.
clean the ISC.
or find intake leaks.
see chapter emissions here.
it means IDLE controls are out of control.
only that. and many things can cause that.
lean fuel mixture, gross misfire.
a tech, checks all these things. the engine is running right
and when sure the engine is right, and holds closed loop at idle !!!
then and only then start testing the ISC.
we make sure it can move through its range.
and that the throttle plate is not blocked. for (any reasons)
and then make sure there are no vacuum leaks.
on MAP based systems, any air leak cases the engine to race
and if bad enough the ISC fails to work right. (for sure)
those are the hit lists. the tests are extensive.
Posted on Jun 05, 2014
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Posted on Jan 02, 2017
The code P1294 means that the computer is setting a target for the engine to idle at and the engine cannot do it therefore setting the DTC. Solution start by checking or replacing the sparkplugs. Also remove the idler motor from the throttle body and spray it out with carb cleaner. Also spray out the passages in the throttle body that the idle motor use. If that does not fix it you could have another problem like a bad idle motor or something relating to that circuit. Did you replace the TB or make an adjustment to the TPS?
Posted on Sep 22, 2009
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