Ignition - Correct Use of Spark Tester

Number: 92-257-6D

Section: 6D

Date: AUGUST 1992

Corporate Bulletin No.: 216517

ASE No.: A6


Subject:
CORRECT USE OF SPARK TESTER TOOL J26792 FOR VEHICLES WITH ELECTRONIC DISTRIBUTORLESS IGNITION (DIS) SYSTEMS

Model and Year:
1987-90 CELEBRITY 1987-92 CAVALIER, CORSICA AND BERETTA 1990-92 LUMINA



NOTICE:
The following conditions may cause damage to ignition system components or incorrect diagnosis and replacement of good parts due to excessive secondary voltages required to fire the ST-125:

- Failure to ground secondary wire for companion cylinder.
- Use of more than one ST-125 on a single coil.
- Failure to clip ST-125 directly to ground.

When connecting the ST-125 HEI Spark Tester (J 26792) to vehicles equipped with Electronic Distributorless Ignition (DIS) Systems, the following procedure must be used to avoid damage to ignition system components and misdiagnosis:

1. Install ST-125 at plug end of secondary wire for suspect cylinder and clip ST-125 to ground at engine block. Avoid placing ST-125 near Sensors, Modules, or other Electronic Devices which may be affected by electromagnetic interference.

2. Disconnect plug end of secondary wire for companion cylinder and jumper directly to ground at engine block.

3. Continue with appropriate diagnosis. (Chart A-3, Chart C-4, or "Symptoms" Section "6E3-B").