GM Bonneville/Eighty Eight/LeSabre 1986-1999

Diagnosis and TESTING

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SERVICE PRECAUTIONS



See Figures 1 through 10


CAUTION
The ignition coil's secondary voltage output capabilities can exceed 40,000 volts. Avoid bodily contact with the C3I high voltage secondary components when the engine is running, or personal injury may result.

To avoid damage to the ECM/PCM or other ignition system components, do not use electrical test equipment such as a battery or AC-powered voltmeter, ohmmeter, etc., or any type of tester other than specified.

  1. Check for trouble codes, as described in Driveability & Emissions Controls . If any are found, refer to the appropriate diagnostic procedure in Driveability & Emission Controls .
  2.  
  3. When performing electrical tests on the system, use a high impedance multimeter or quality digital voltmeter (DVM). Use of a 4 volt test light is not recommended.
  4.  
  5. To prevent electrostatic discharge damage when working with the ECM, do not touch the connector pins or soldered components on the circuit board.
  6.  
  7. When handling a PROM, CAL-PAK or MEM-CAL, do not touch the component leads. Also, do not remove the integrated circuit from the carrier.
  8.  
  9. Never pierce a high tension lead or boot for any TESTING purpose; otherwise, future problems are guaranteed.
  10.  
  11. Do not allow extension cords for power tools or droplights to lie on, near or across any vehicle electrical wiring.
  12.  
  13. Leave new components and modules in the shipping package until ready to install them.
  14.  



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Fig. Fig. 1: Ignition system circuits - 3.8L (VIN C) engine



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Fig. Fig. 2: Ignition system diagnosis (1 of 2) - 3.8L (VIN C) engine



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Fig. Fig. 3: Ignition system diagnosis (2 of 2) - 3.8L (VIN C) engine



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Fig. Fig. 4: Ignition system circuits - 1992-93 3.8L (VIN L and 1) engines



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Fig. Fig. 5: Ignition system diagnosis (1 of 2) - 1992 vehicle with Type I ignition system



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Fig. Fig. 6: Ignition system diagnosis (2 of 2) - 1992 vehicle with Type I ignition system



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Fig. Fig. 7: Ignition system diagnosis (1 of 2) - 1992-93 vehicles with Type II ignition system



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Fig. Fig. 8: Ignition system diagnosis (2 of 2) - 1992-93 vehicles with Type II ignition system



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Fig. Fig. 9: Ignition system circuits - 1994-95 vehicles



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Fig. Fig. 10: Ignition system diagnosis - 1994-95 vehicles

 
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