Jeep Wrangler/YJ 1987-1995 Repair Guide

Troubleshooting

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DIAGNOSTIC TESTS



See Figures 1 through 28

If an M.S. 1700 or Diagnostic Readout Box (DRB) is used, the following test procedures are not applicable. Follow the directions included with the tester.

The following diagnostic procedures require a digital volt-ohmmeter (minimum 1 ohm;), a twelve point test lamp (type 1892 or equivalent), an assortment of jumper wires and probes, a hand vacuum gauge, and a timing light. For additional tests, please refer to the American Motors Solid State (Renix) Ignition System information in Engine Performance & Tune-Up of this guide.



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Fig. Fig. 1: TBI system diagnostic connectors-1987-90 2.5L engine



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Fig. Fig. 2: TBI ECU connector-1987-90 2.5L engine



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Fig. Fig. 3: TBI engine control system wiring schematic-1987-90 2.5L engine



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Fig. Fig. 4: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 5: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 6: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 7: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 8: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 9: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 10: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 11: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 12: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 13: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 14: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 15: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 16: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 17: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 18: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 19: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 20: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 21: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 22: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 23: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 24: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 25: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 26: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 27: TBI system diagnostic test-1987-90 2.5L engine



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Fig. Fig. 28: TBI system diagnostic test-1987-90 2.5L engine

 
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