Diagnostic Request Terminal

The diagnostic request terminal is located in the duty check data link connector. When the diagnostic request terminal is grounded, the powertrain control module outputs the idle speed control motor duty cycle (throttle valve opening) through the duty check terminal. The idle speed control motor duty cycle can be read with a DMM at the duty check terminal when the diagnostic request terminal is grounded.

When both the test switch terminal and the diagnostic request switch terminal are grounded simultaneously, the powertrain control module outputs the air/fuel duty cycle through the duty check terminal.