[TonyMac]

Ok I have a 1998 jeep cherokee with a inline 6 4.O Liter and the check engine light has been coming on and off so I pull the codes on it.I was wanting to know if anybody could help me read the codes here they are.


PO320-Ign/Dist RPM Circuit Input Malf

PO756A-Shift Sol B Perf Or Stuck off

PO740A-TCC Circuit Malf


If anybody can help me I would appreciate it.

[Jmark]

Originally posted by TonyMac
Ok I have a 1998 jeep cherokee with a inline 6 4.O Liter and the check engine light has been coming on and off so I pull the codes on it.I was wanting to know if anybody could help me read the codes here they are.


PO320-Ign/Dist RPM Circuit Input Malf

PO756A-Shift Sol B Perf Or Stuck off

PO740A-TCC Circuit Malf


If anybody can help me I would appreciate it.

the first one is in relation to the crank sensor. Could be a failure or a intermittant problem.

Second one is for the second to third gear shift solonoid, possible failure or intermittant problem.

third refers to the torque converter lockup. No rpm change detected when lockup is called for.


Looks like its time for a trip to the shop. Make sure that where ever you take it has the necessary OBDII test equipment and the know how to use it.

Mark

[TonyMac]

I just had the jeep in the shop today and we did a OBDII scan and these are the codes that it brought up.

PO320-Ign/Dist RPM Circuit Input Malf

PO756A-Shift Sol B Perf Or Stuck off

PO740A-TCC Circuit Malf

[TonyMac]

I can drive the jeep with all this going on I need it tommorrow to carry mail?

[2-manytoyzs]

Now you need to do the pinpiont test for that code. That test will check the wiring and related components for opens or short to power or ground. If your vehicle has a cam sensor, the PCM will automatically switch to that sensor as a back up and still operate the processor. If it only has a crank sensor and the sensor completely fails, the engine could die or more than likely go into failure mode management where the engine will still run but only run at a base timiing and fuel setting. Yoou would notice a definate loss of power in FM mode.
Have you noticed any driveability concerns or shifting problems? Does it go into OD?
My ck eng. lite is on with a 0320 code also. Been on for 6 months and it runs fine. I'll get round to it someday.