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P1682

Tiny
THEONETRUEDOUG
  • MEMBER
  • 1998 JEEP WRANGLER TJ
  • 96,000 MILES
Ck gauges light come on after a few minutes or accelleration. Replaced battery and alternator (twice). Volt meter starts at 14v and goes to 0 after few minutes or when accellarating. The same sequence happens at every start, battery eventually needs charging for the car to start and. Forums suggest the PDM (PCM) HAS ISSUES? I want to know how th check the pdm/pcm for malfunction and how to repair it.
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Monday, May 13th, 2013 AT 1:06 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
Measure the voltages on the two small wires and the larger output wire on the alternator while the problem is occurring and the engine is running. Holler back with those numbers.
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Monday, May 13th, 2013 AT 10:40 PM

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