Jeep Cherokee Forum - '96 Cherokee Throwing Code P1493

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mjonesjr

Apr 10, 2011 05:19 PM

'96 Cherokee Throwing Code P1493

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

OverlandZJ

Apr 10, 2011 05:29 PM

Battery sensor low voltage..

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

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

mjonesjr

Apr 10, 2011 05:43 PM

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

tjwalker

Apr 10, 2011 06:38 PM

Quote:

Originally Posted by mjonesjr (Post 951782)

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.

mjonesjr

Apr 10, 2011 06:41 PM

Quote:

Originally Posted by tjwalker (Post 951860)

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.

KD3NE

Apr 10, 2011 07:43 PM

Quote:

Originally Posted by mjonesjr (Post 951864)

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.

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