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- ELECTRICAL - VEHICLE SPEED SIGNAL (VSS) INPUT NOTICED WHEN TESTING WITH NEW GENERATION STAR TESTER (NGS) WHEN VEHICLE IS STOPPED - SUPER DUTY F-53 MOTORHOME CHASSIS VEHICLES BUILT 1/2/1998 THROUGH 7/31/2000
- TRANSMISSION - 4R100 - TRANSMISSION STARTS OUT IN 2ND GEAR - ERRATIC 1-2 UPSHIFT OR ERRATIC 2-1 DOWNSHIFT FROM TRANSMISSION - SUPER DUTY F-53 MOTORHOME CHASSIS VEHICLES BUILT 1/2/1998 THROUGH 7/31/2000
| Publication Date: MAY 28, 2002 |
| 1999-2000 SUPER DUTY F-53 STRIPPED CHAS. |
Article 01-6-4 is being republished in its entirety to update the model year coverage.
Some vehicles may exhibit an erratic transmission 1-2 upshift or 2-1 downshift or may start out in 2nd gear. This may be caused by a vehicle speed signal from the Anti-lock Brake System (ABS) module that is contaminated with engine electrical noise from the engine wiring harness on the ground circuit. A vehicle speed input to the Powertrain Control Module (PCM) may be noticed when using a New Generation Star (NGS) tester to monitor the Vehicle Speed Sensor (VSS), even when the vehicle is not moving.
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