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Electronic Spark Timing (EST)

To check system operation, check timing at 1500 RPM with ALDL ungrounded. Locate ALDL connector.
ALDL is located behind right side of instrument panel. See Fig 1 .
Install jumper wire between terminals No. 1 and 3 of ALDL connector. See Fig 1 . Note timing at 1500 RPM. If timing changes, system is operating correctly.

Fig 1: Locating ALDL Connector (Rodeo 3.2L, Stylus & Trooper)

Courtesy of ISUZU MOTOR CO.