OD switch on the shifter
KOER DTC P1780: Check Transmission Control Switch Function
This DTC indicates Transmission Control Switch (TCS) was not cycled during KOER self-test. Possible causes are:
TCS Not Cycled During Self-Test
TCS Circuit Open Or Shorted
Turn ignition switch to ON position. Using scan tool, select TCS PID from PID/DATA MONITOR & RECORD menu. Cycle TCS switch. Then hold switch depressed for 3 seconds, then release switch. If TCS PID value switched from ON to OFF, then indicated ON when switch was depressed, repeat KOER ON-DEMAND SELF-TEST ensuring to cycle TCS.
Wednesday, March 24th, 2010 AT 8:43 PM