Shift Select System Diagnosis

Circuit Description
The shift select system allows the driver to select one of two shift patterns, NORMAL or PERFORMANCE. The PERFORMANCE / NORMAL switch is a normally open switch, that when closed, provides a ground path to the Powertrain Control Module (PCM). When the PCM receives the ground signal, it switches into the PERFORMANCE mode and the following changes occur:
^ Upshifts occur at a higher engine speed.
^ Downshifts occur at a lower percentage throttle position.
^ Engine torque output is increased in 2nd and 3rd gear.





Diagnostic Aids
^ Inspect the connectors at the PCM, the PERFORMANCE / NORMAL switch and all other circuit connecting points for an intermittent condition.
Refer to Testing for Intermittent and Poor Connections in Diagrams/Diagnostic Aids.
^ Inspect the circuit wiring for an intermittent condition.
Refer to Testing for Electrical Intermittents in Diagrams/Diagnostic Aids.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
1. This step verifies that the Performance/Normal Switch is functioning properly.
3. This step determines if a condition exists in circuit 1550.