LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jaguar >> 2004 >> XJ8 Base >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> External Controls >> Diagnosis & Testing >> Pinpoint Tests >> "J" Gate System Circuit Checks
April 5, 2026: LEMON Manuals is launched! Read the announcement.

"J" Gate System Circuit Checks

  1. CHECK FOR IGNITION FEED TO THE J-GATE 
    1. Disconnect the "J" gate assembly electrical connector CA245.
    2. Turn the ignition to the "ON" position.
    3. Measure the voltage at CA245 Pin 1 (GO).
      • Is the voltage greater than 10 Volts? 

        Yes:  Go to next step.

        No:  Repair the electrical circuit between the "J" gate assembly electrical connector CA245 Pin 1 (GO) and the rear power distribution box FUSE 3. Clear the DTC. TEST the system for normal operation.

        NOTE: This circuit incorporates the ignition switch and the primary junction box. For additional information, refer to the vehicle WIRING DIAGRAMS .
  2. CHECK THE GROUND SUPPLY TO THE "J" GATE 
    1. Measure the resistance between the "J" gate assembly electrical connector CA245 Pin 2 (B) and GROUND.
      • Is the resistance less than 5.0 Ohms? 

        Yes:  Go to next step.

        No:  Repair the circuit between the "J" gate assembly electrical connector CA245 Pin 2 (B) and GROUND. Clear the DTC. TEST the system for normal operation.

  3. CHECK FOR "J" GATE ILLUMINATION FEED 
    1. Turn the ignition to the "ON" position.
    2. Measure the voltage at CA245 Pin 3 (UY).
      • Is the voltage greater than 10 Volts? 

        Yes:  Go to next step.

        No:  Repair the electrical circuit between the "J" gate assembly electrical connector CA245 Pin 3 (UY) and the front electronics module electrical connector. For additional information, refer to the vehicle WIRING DIAGRAMS . Clear the DTC. TEST the system for normal operation.

  4. CHECK FOR KEY INTERLOCK FEED CIRCUIT FOR CONTINUITY 
    1. Disconnect the "J" gate assembly electrical connector CA245.
    2. Disconnect the ignition switch electrical connector FC018.
    3. Measure the resistance between the "J" gate assembly electrical connector CA245 Pin 4 (Y) and the ignition switch electrical connector FC018 Pin 3 (Y).
      • Is the resistance less than 5.0 Ohms? 

        Yes:  Go to next step.

        No:  Repair the electrical circuit between the "J" gate assembly electrical connector CA245 Pin 4 (Y) and the ignition switch electrical connector FC018 Pin 3 (Y). Clear the DTC. TEST the system for normal operation.

  5. CHECK FOR KEY INTERLOCK ACTION 
    1. Check for continuity between Pin 3 and Pin 4 of the ignition switch lock cylinder.
      • Is the circuit continuous? 

        Yes:  Install a new "J" gate. Clear the DTC. TEST the system for normal operation.

        No:  Install a new IGNITION SWITCH LOCK CYLINDER . Clear the DTC. TEST the system for normal operation.

scientia non olet · About LEMON Manuals