Electronic Spark Timing (EST) (Pickup 3.1L)

1. To check system operation, check timing at 1500 RPM with ALDL ungrounded. Locate ALDL connector.
2. ALDL is located behind right side of instrument panel below left side of instrument panel on Pickup. See Fig 1 or Fig 2 .
3. On Pickup 3.1L, install jumper wire between terminals "A" and "B" of ALDL connector. See Fig 1 . See Fig 2 . Note timing at 1500 RPM. If timing changes, system is operating correctly.

Fig 1: Locating ALDL Connector (Pickup 3.1L)

Courtesy of ISUZU MOTOR CO.

Fig 2: Locating ALDL Connector (Rodeo 3.2L & Trooper)

Courtesy of ISUZU MOTOR CO.