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HOMESERVICE MANUALSJEEP2009WRANGLER X, AUTOMATICREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANS(TRANSMISSION CONTROL MODULE (TCM) - ELECTRICAL DIAGNOSTICS)DTC TROUBLESHOOTINGP1794-SPEED SENSOR GROUND ERRORDIAGNOSTIC TEST
2009 Jeep Wrangler X, Automatic

Diagnostic Test

2009 Jeep Wrangler X, AutomaticSECTION Diagnostic Test
  1. CHECK TO SEE IF DTC P1794 IS CURRENT 
    1. Engine Running, Shift lever in park.
    2. With the scan tool, read the Transmission Output and Input Speed Sensor states.

      Is the Output Speed Sensor reading twice the Input Speed Sensor reading?

      Yes 

      • Go to step  2

      No 

      • Go to step  6
  2. PCM AND WIRING 
    1. Turn the ignition off to the lock position.
    2. Remove the Ignition Switch Feed fuse from the TIPM.
      CAUTION: Removal of the Ignition Switch Feed fuse from the TIPM will prevent the vehicle from being started in gear.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.