2002 Chrysler PT Cruiser Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Scan Tool Blank Screen

WARNING: This page is about a different car, the 2002 Dodge Ram Wagon, 2002 Dodge Ram Van, 2001 Dodge Ram Wagon, and 2001 Dodge Ram Van. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Perform BODY VERIFICATION TEST  under VERIFICATION TESTS after each repair.

Possible Causes:

  1. Open Ground Circuit At DLC Cavity No. 5
  2. Open Ground Circuit At DLC Cavity No. 4
  3. Open Fused B+ Circuit
  4. Scan Tool Cable
  5. Scan Tool

Testing

  1. Turn ignition off. Disconnect scan tool from DLC. Using a DVOM, measure resistance between ground and DLC terminal No. 5 (Black/Violet wire). See Figure . If resistance is more than 5 ohms, repair open or high resistance in Black/Violet wire between DLC and ground. If resistance is less than 5 ohms, go to next step.
  2. Using a DVOM, measure resistance between ground and DLC terminal No. 4 (Black/Tan wire). If resistance is more than 5 ohms, repair open or high resistance in Black/Tan wire between DLC and ground. If resistance is less than 5 ohms, go to next step.
  3. Using a DVOM, measure voltage between ground and DLC terminal No. 16 (Violet wire). If battery voltage is not present, repair open in Violet wire between DLC and fuse block. If battery voltage is present, go to next step.
  4. Install scan tool using a different scan tool cable. If scan tool is operational, replace original scan tool cable. If scan tool screen is still blank, go to next step.
  5. Install a known-good scan tool. If scan tool is operational, repair or replace original scan tool. If scan tool screen is still blank, refer to scan tool manufacturer's operating manual for further instructions.
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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.