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Old 04-13-2014, 11:23 AM
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Exclamation Error code P0201

I need help with this one:
2005 Liberty 3.7L
Error code P0201
Sight rough idle; acceleration pulses (rpms rev-drop-rev-drop)
This is what I have done up to now:
1: Replaced #1 injector (ohm-ed 3.9) spot melted thru
2: Replaced spark plug. was only 2 months old (Stud was worn on angle)
3: Checked mag pack (was ok)
4: while running pulled wires from injector and mag pack from cyc. #1 with no change in idle or rev.
5: scoped all injectors 1 does not click the same as others (not as loud)
6: swapped injector and mag pack to to cyc. 4 ( no change ) pulls same code
7: checked power from plugs: not sure what it should be but is consistent with other cylinders.
8: checked TPS, Sensor ohms: left pin to center pin .1, right pin to center pin 4.8. Plug volts: left pin to ground 5.1v +-, center pin to ground 0v, right pin to ground 5.1v+- (I'm not sure if there should be 2 5v studs on the plug)

Please help

Thanks, Tom
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Old 04-15-2014, 01:55 PM
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My Jeep: 2005 3.7L KJ
 
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Re: Error code P0201

UPDATE:

I'm not getting a control signal from the PCM on injector #1.
More 1 on 1 time with the DVOM.
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