Output Diagnostic Test Mode (Circuit Actuation Tests)
1985-891. Place system in diagnostic test mode and wait for code 55 to appear on display screen.
2. Press ATM button on tool to activate display. A specific ATM test can be called by holding down ATM button until desired code appears.
The computer will continue to turn selected circuit on and off for up to 5 minutes or until ATM is pressed again or if ignition switch is turned off.
Actuator Test Display Codes
Code Description
01 - Spark Activation - Once every 2 seconds.
02 - Injector Activation - Once every 2 seconds.
03 - AIS Activation - One pulse open/one pulse closed every 4 seconds.
04 - Radiator Fan Activation - One pulse every 2 seconds.
05 - A/C Cutout Relay Activation - One pulse every 2 seconds.
06 - ASD Relay Activation - One toggle every 2 seconds.
07 - EGR/Purge Solenoid Activation - One toggle every 2 seconds.
08 - EGR Solenoid Activation (1985-86) - One toggle every 2 seconds.
- Speed Control Vacuum And Vent Solenoid Activation (1987-89) - Once every 2 seconds.
09 - Wastegate Solenoid Activation - One toggle every 2 seconds.
10 - Barometric Read Solenoid Activation - One toggle every 2 seconds.
11 - Alternator Full Field Activation (1986-89) - One toggle every 2 seconds.