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Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Alternator & Regulator) >> Self-Diagnostic Tests >> Test TC-39B, Checking Pcm Regulating Circuit

Test TC-39B, Checking Pcm Regulating Circuit

WARNING: This page is about a different car, the 1994 Plymouth Sundance, 1994 Plymouth Acclaim, 1994 Dodge Spirit, 1994 Dodge Shadow, and 1994 Chrysler LeBaron. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Perform TEST TC-39A, CHARGING SYSTEM VOLTAGE HIGH  before proceeding. After each repair is completed, perform TEST CH-VER, CHARGING VERIFICATION .
  1. Using DRB, stop ASD fuel system actuation. With ignition on and engine off, read DRB VOLTAGE GOAL. If voltage goal is less than 13 volts, replace Powertrain Control Module (PCM). PCM is located behind battery.
  2. If voltage goal is more than 13 volts, start engine and manually set idle to 1600 RPM. Using DRB, read VOLTAGE GOAL and voltage reading. Compare readings. If necessary, watch readings for up to 5 minutes looking for a one volt or more difference.
  3. If voltage difference is more than one volt, replace PCM. If voltage difference is less than one volt, turn engine off leaving ignition on and go to TEST CH-1A, CHECKING CHARGING SYSTEM NO TROUBLE CODES.
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