Check Engine Request

Part 1 Of 2:

Part 2 Of 2:

If an emission related fault occurs in the automatic transmission, the control module will send a PRIM signal with a frequency of 2 Hz from pin 26 to Trionic pin 61. The engine control module then sends a signal to the main instrument unit, which turns on the HECK ENGINE lamp.
When the ignition key is turned to the ON position, the control module sends a ground pulse for 1 second as a functional check.