I am: Bob .
Join Date: Nov 2004
Vehicle: 2003 Ford Ranger
Drive Type: 4x4
Total Props: 19
The ABS sensor on the diff does double duty as a VSS for speedometer input in 98~00 Ranger and 01 2.5L Ranger. Other years use this sensor for ABS only.
The 95~97 speedometer gets its signal directly from a gear driven Signal Generator. The 2WD SG is driven from the transmission; the 4x4 SG is near the top of the transfer case.
The SG uses two wires. The gray/black goes to the speedometer, PCM and speed control in parallel. The pink/orange goes to the bolted ground under the hood on the DS inner fender apron.
Possible causes for dead speedometer:
Open/grounded gr/bk wire
Open pk/or from SG to DS inner fender apron ground point
Bad speedo head/cluster
Bad Signal Generator
Stripped drive gear for SG
2003 FX4 Level II, Supercharged 5.0L V8, Headers,Duals 4R70W auto, BW4406 manual T/C
Aussie Locker, Torsen L/S, 4.10's, Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos, Heated seats, Explorer EATC, Trip Computer and consoles
5.0L V8 swap: Click
2003 XLT 2.3L M5OD-R1 reg cab beater, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid