'96 Cherokee Throwing Code P1493

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Apr 10, 2011 | 05:19 PM

mjonesjr

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Joined: Jan 2011

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From: Salem, IN

Year: 1998

Model: Cherokee

Engine: 4.0

'96 Cherokee Throwing Code P1493

Anyone know what P1493 PCM code on a '96 XJ is?

Apr 10, 2011 | 05:29 PM

OverlandZJ

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Joined: May 2008

Posts: 5,188

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From: Bristol,Pa

Year: 94

Model: Cherokee

Engine: 4.0L

Battery sensor low voltage..

Check the sensor under battery for a broken/corroded wire.

http://www.jeepwranglertech.com/jeep...des-OBDII.html

Apr 10, 2011 | 05:43 PM

mjonesjr

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From: Salem, IN

Year: 1998

Model: Cherokee

Engine: 4.0

There is a sensor on the bottom of the battery that reads battery temp? Weird.

Apr 10, 2011 | 06:38 PM

tjwalker

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Posts: 5,839

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From: In the middle of Minnesota!

Year: 1999

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by mjonesjr

There is a sensor on the bottom of the battery that reads battery temp? Weird.

It provides input to help regulate your charging system. Real cold battery = More charging. And vice versa.

Apr 10, 2011 | 06:41 PM

mjonesjr

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From: Salem, IN

Year: 1998

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by tjwalker

It provides input to help regulate your charging system. Real cold battery = More charging. And vice versa.

Hmmmm.....

The gauge in the dash drops well below 14v when I turn the heater controls on high. However, the battery never shows less than 14v using a multimeter.

Apr 10, 2011 | 07:43 PM

KD3NE

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Joined: Feb 2011

Posts: 719

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From: Bel Air, Maryland 21015

Year: 1995

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by mjonesjr

Hmmmm.....

The gauge in the dash drops well below 14v when I turn the heater controls on high. However, the battery never shows less than 14v using a multimeter.

Voltage drop due to line loss.

Your multimeter is on top of the battery, there is a bit of wire, and probably a couple of connectors between the dash gauge and battery.

Even with the multimeter you might see a momentary voltage drop when you turn the heater fan on, but it should recover. The dip may occurs so fast that the voltmeter misses it.