P0819 | Up and Down Shift Switch to Transmission Range Correlation | The PCM detects a voltage high signal when an upshift or downshift is requested. |
Possible Sources
Circuitry open/shorted
Clockspring
Selector lever assembly
Selector lever knob
SCCM
PCM
DIAGNOSIS AND TESTING > EXTERNAL CONTROLS > PINPOINT TESTS > PINPOINT
TEST B : PADDLE SHIFT DOES NOT OPERATE CORRECTLY > PINPOINT TEST B :
PADDLE SHIFT DOES NOT OPERATE CORRECTLY
B1 MONITOR SHIFT SELECT PIDS
Ignition ON.
Enter the following diagnostic mode: Datalogger.
Monitor the PCM PIDs, SST_D and SST_U while depressing the upshift and downshift switches.
Do both the upshift and downshift PIDs show low when their respective switch is depressed and high when the switch is not depressed?
Yes | The system is operating correctly at this time. The concern may have been caused by a loose connector. |
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No | If the Upshift switch PID reads high when the switch is pressed, or if the Upshift PID reads low when the switch is not pressed, GO to B2. If the Downshift switch PID reads high when the switch is pressed, or if the Downshift PID reads low when the switch is not pressed, GO to B9. If the PIDs for both switches show no change when both of the switches are pressed, GO to B12 |
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B2 CHECK THE UPSHIFT PADDLE SWITCH
Remove the driver air bag module. REFER to: Driver Airbag .
Disconnect Upshift Paddle Switch Connector C2428 .
Measure:
Original technical text and illustrations, formatted as HTML. Follow the engine, transmission, equipment, model and year specified in the source. Import and layout checks do not establish applicability to every 2015–2017 Mustang. About this collection.