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Normal IOD for a PT

 
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Old 13 Feb 2013, 12:10 am
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Question Normal IOD for a PT

Does anybody know what the normal "ignition off draw" would be on a 2002 PT Cruiser? I'd heard it should be less than 20 milliamps. I'd like to check it. And no, I don't have the Mopar Subwoofer that has been known to cause excessive IOD.

The reason I'm asking is that it seems that my battery seems to drain down quicker than it should during the week, and it's brand new and tested. The charging system is working fine. I don't drive the car everyday, so that may contribute to the problem.
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Old 13 Feb 2013, 11:52 am
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Default Re: Normal IOD for a PT

The PT wiring manual doesn't give a number, but 20 milliamps is a typical IOD. Certainly, anything more than 50 milliamps would be cause for concern IMHO.
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Old 13 Feb 2013, 12:01 pm
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Default Re: Normal IOD for a PT

Thanks. That's what I've been finding reading online. You'd think the official repair manual would give a spec like that. It's kind of an important to know that little detail for troubleshooting computer controlled cars with low battery problems.
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Old 13 Feb 2013, 12:08 pm
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Default Re: Normal IOD for a PT

here you go, straight from ALLDATA Pro:


2002 Chrysler Truck PT Cruiser L4-2.4L VIN B
Vehicle Power and Ground Distribution Power Interrupt Connector/Switch Testing and Inspection

Testing and Inspection

STANDARD PROCEDURE - IGNITION-OFF DRAW TEST
The term Ignition-Off Draw (IOD) identifies a normal condition where power is being drained from the battery with the ignition switch in the OFF position. A normal vehicle electrical system will draw from 5 - 35 milliamperes (0.005 - 0.035 ampere) with the ignition switch in the OFF position, and all non-ignition controlled circuits in proper working order. Up to 35 milliamperes are needed to enable the memory functions for the Powertrain Control Module (PCM) , digital clock, electronically tuned radio, and other modules which may vary with the vehicle equipment.

A vehicle that has not been operated for approximately twenty days, may discharge the battery to an inadequate level. When a vehicle will not be used for twenty days or more (stored), remove the IOD fuse from the Power Distribution Center (PDC) . This will reduce battery discharging.

Excessive IOD can be caused by:

Electrical items left ON.
Faulty or improperly adjusted switches.
Faulty or shorted electronic modules and components.
An internally shorted generator.
Intermittent shorts in the wiring.

If the IOD is over 35 milliamperes , the problem must be found and corrected before replacing a battery. In most cases, the battery can be charged and returned to service after the excessive IOD condition has been corrected.

Verify that all electrical accessories are OFF. Turn OFF all lamps, remove the ignition key, and close all doors. If the vehicle is equipped with an illuminated entry system or an electronically tuned radio, allow the electronic timer function of these systems to automatically shut off (time out). This may take up to 3 minutes .
Determine that the underhood lamp is operating properly, then disconnect the lamp wire harness connector or remove the lamp bulb.
Disconnect the battery negative cable.
Set an electronic digital multi-meter to its highest amperage scale. Connect the multi-meter between the disconnected battery negative cable terminal clamp and the battery negative terminal post. Make sure that the doors remain closed so that the illuminated entry system is not activated. The multi-meter amperage reading may remain high for up to 3 minutes , or may not give any reading at all while set in the highest amperage scale, depending upon the electrical equipment in the vehicle. The multi-meter leads must be securely clamped to the battery negative cable terminal clamp and the battery negative terminal post. If continuity between the battery negative terminal post and the negative cable terminal clamp is lost during any part of the IOD test, the electronic timer function will be activated and all of the tests will have to be repeated.
After about 3 minutes , the high-amperage IOD reading on the multi-meter should become very low or nonexistent, depending upon the electrical equipment in the vehicle. If the amperage reading remains high, remove and replace each fuse or circuit breaker in the Power Distribution Center (PDC) and then in the Junction Block (JB) , one at a time until the amperage reading becomes very low, or nonexistent. Refer to the appropriate wiring information for complete PDC and JB fuse, circuit breaker, and circuit identification. This will isolate each circuit and identify the circuit that is the source of the high-amperage IOD. If the amperage reading remains high after removing and replacing each fuse and circuit breaker, disconnect the wire harness from the generator. If the amperage reading now becomes very low or nonexistent, refer to Charging System for the proper charging system diagnosis and testing procedures. After the high-amperage IOD has been corrected, switch the multi-meter to progressively lower amperage scales and, if necessary repeat the fuse and circuit breaker remove-and-replace process to identify and correct all sources of excessive IOD. It is now safe to select the lowest milliampere scale of the multi-meter to check the low-amperage IOD.

CAUTION: Do not open any doors, or turn ON any electrical accessories with the lowest milliampere scale selected, or the multi-meter may be damaged.

Observe the multi-meter reading. The low-amperage IOD should not exceed 35 milliamperes (0.035 ampere) . If the current draw exceeds 35 milliamperes , isolate each circuit using the fuse and circuit breaker remove-and-replace process in Step 5. The multi-meter reading will drop to within the acceptable limit when the source of the excessive current draw is disconnected. Repair this circuit as required; whether a wiring short, incorrect switch adjustment, or a component failure is at fault.
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Old 13 Feb 2013, 12:28 pm
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Default Re: Normal IOD for a PT

WOW, that's ever better! I'm going to keep that in my official factory repair manual!

I'm not a member of ALLDATA, but they sure have more info than even the factory shop manual. I might look into becoming a member. I don't have the factory repair manual for my other truck because it would cost me around $900! What does the ALLDATA Pro membership cost?
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Old 13 Feb 2013, 01:44 pm
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Default Re: Normal IOD for a PT

Quote:
Originally Posted by manfred View Post
WOW, that's ever better! I'm going to keep that in my official factory repair manual!

I'm not a member of ALLDATA, but they sure have more info than even the factory shop manual. I might look into becoming a member. I don't have the factory repair manual for my other truck because it would cost me around $900! What does the ALLDATA Pro membership cost?
i couldn't tell you. a close family friend lets me use his account. it keeps me from calling and asking him constant and never ending questions (:
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Old 14 Feb 2013, 04:04 am
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Default Re: Normal IOD for a PT

Thanks rob for an excellent post. Cars with their alarm systems set in the on mode will draw more current than when off. ALLDATA price 2 years ago was $30 for a 1 year subscription.
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Old 14 Feb 2013, 11:11 pm
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Default Re: Normal IOD for a PT

Thanks everyone. I just checked what my PT's IOD is and it came out to 14.5 milliamps. Well under the 35 milliamp threshold. I also don't leave the alarm on when it's parked in the garage, so that's not a problem either.

I just bought a new Ctek smart charger and I'm very happy with it. I'll use it to keep my battery topped off when I'm not driving the PT enough.
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Old 15 Feb 2013, 04:24 pm
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Default Re: Normal IOD for a PT

Sounds good...thanks for the update.
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