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2.5L & 4.0L Primary Ignition

  1. Ensure battery has a minimum of 12.5 volts (9.5 cranking volts) available to operate cranking and ignition systems.
  2. Using an analog voltmeter, backprobe the following wires at distributor. Touch positive lead to Tan/Yellow wire (Gray/Black wire on Wrangler). Touch negative lead to the Black/Blue wire (Brown/Red wire on Wrangler).
  3. Set voltmeter to 15-volt DC scale. Crank engine. Voltmeter needle should fluctuate between 0-5 volts. If voltmeter needle does not fluctuate between 0-5 volts, check related circuits or replace sync pulse generator. If sync pulse generator is okay but engine does not start, see TESTS W/CODES article in this section and check SBEC-II.
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