Question about 1996 Jeep Grand Cherokee

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I have a possible short circuit in the ignition switch unit

Have a problem with the battery completely flattening overnight, have heard a clicking sound in the ignition switch and after hooking up the battery charger this clicking corresponded to the b/charger flicking up to 8 amps from 2 amps each time the switch made a sound. Any thoughts here? Is there a common problem with Cherokee (1996 Limited Ed 4.0Lt) having short circuit in the switch? Thank you,

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What you have described sounds like the battery itself is internally shorted or has a bad plate, an easy way to tell is if the sides of the battery are bulged out. You can also this, with the battery presumably fully charged, dis-connect the battery cables and then connect a volt-meter to the battery, the battery should be holding at 12.5 volts with the battery cables dis-connected from the battery, and if you can actually watch as the voltage drops off then you know the battery is not any good.

If the battery is less than a year or two old, and checks out to be in good condition, then you might have a power draw on the battery coming from the electrical system somewhere. You will need a test light to check for a power draw in the electrical system.

Make sure that all power accessories are off, including the ignition switch, and that there are no lights left on from an open door or a light switch, when you are certain that everything is off on the vehicle then re-connect the Pos. (+) battery cable to the battery, and then connect the test light lead to the Neg. (-) battery cable and then use the probe end of the test light and connect it to the Neg. (-) battery post on the battery, the test light should be bright for a few seconds and the dim down real low until the test light is almost no longer lighted, indicating that only the KEM (Keep Alive Memory) is using battery power.

If the test light stays bright then there is a power draw or drain on the electrical system, and the only thing that you can do is to leave the test light connected to the battery, and start removing the fuses one at a time until the test light goes out or it dims down low like it should, and then you will at least then know what circuit to look at for the problem.

The clicking sound that you hear is most likely the starter solenoid plunger making noise because the battery does not have enough voltage or amperage to keep the plunger pulled back and also properly engage the starter motor.

This problem is not un-common to any vehicle.

I hope that any of this information was helpful to you in any way at all to help you solve your problem.

Posted on May 16, 2010

  • jransley May 16, 2010

    Cheers and thanks for help, the battery holds 13.5 volts after recharging, when i put a multi- meter on it after installing back in the car it shows 6 amps drawing with EVERTHING off! The clicking sound is definitely in the actual ignition switch unit, which is why i was wondering if they have a common problem with internal shorting. I will do the circuit test next on each separate fuse circuit. Cheers J9

  • Zaraki May 16, 2010

    A clicking noise coming from inside the passenger cab at the ignition switch is certainly not normal or a common defect for your vehicle, or for any vehicle, and that ignition switch sounds like it has some internal problems, and I would give thought to replacing it.

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DTC P0243 - Turbo/Super Charger Wastegate Solenoid A
Description: Open or shorted condition detected in the turbocharger wastegate solenoid control circuit.


Here is the flow chart for that code (some images could need to clicking for zoom)...

P0243-WASTEGATE PRESSURE CONTROL PWM

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For a complete wiring diagram Refer to Section 8W.

When Monitored: When the ignition is on.
Set Condition: The ECM detects an open or short circuit in the Wastegate solenoid circuit.

Possible Causes
DAMAGED WIRING HARNESS OR CONNECTORS
WASTEGATE SOLENOID
(F504) FUSED IGNITION SWITCH OUTPUT OPEN
(K139) WASTEGATE SOLENOID DRIVER CIRCUIT OPEN
(K139) WASTEGATE SOLENOID CIRCUIT SHORTED TO GROUND
(K139) WASTEGATE SOLENOID DRIVER SHORTED TO VOLTAGE
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ECM
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Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Diagnostic Test
1. DAMAGED WIRING HARNESS OR CONNECTORS

zjlimited_338.gif

Turn Ignition off.
Disconnect the ECM harness connectors.
Disconnect the Wastegate Solenoid harness connector.

NOTE: Check connectors - Clean/repair as necessary.


Are any wires or pins damaged?

Yes
Repair or replace any damaged wire or connectors.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).

No
Go To 2


2. WASTEGATE SOLENOID

zjlimited_339.gif

Reconnect the ECM harness connector.
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No
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3. (F504) FUSED IGNITION SWITCH OUTPUT OPEN

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Connect an test light between the Wastegate Solenoid connector Fused ignition switch output circuit and battery negative.
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Does the light illuminate brightly?
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4. (K139) WASTEGATE SOLENOID DRIVER CIRCUIT OPEN

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5. (K139) WASTEGATE SOLENOID CIRCUIT SHORTED TO GROUND

zjlimited_343.gif

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6. (K139) WASTEGATE SOLENOID DRIVER SHORTED TO VOLTAGE

zjlimited_344.gif

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zjlimited_345.gif

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zjlimited_346.gif
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