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Discovery Series II & Range Rover

NOTE: Because ECM is able to determine the closed throttle position, the TP sensor does not need to be adjusted when replaced.
  1. Check for poor connections, loose terminals, and open or shorted wires. See WIRING DIAGRAMS article. If no problems are found, go to next step. Perform repairs as necessary.
  2. Turn ignition on. Backprobe between ECM 52-pin connector C0636 terminals No. 24 (Yellow/Light Green wire) and No. 25 (Red/Black wire). Measure voltage while moving throttle valve between fully closed (idle) and fully open (wide open) positions. See THROTTLE POSITION SENSOR VOLTAGE (DISCOVERY SERIES II & RANGE ROVER)  table. If voltage is as specified and changes smoothly, test is complete. If voltage is not as specified, replace TP sensor.
THROTTLE POSITION SENSOR VOLTAGE (DISCOVERY SERIES II & RANGE ROVER)

TP Sensor Position Volts
Minimum Zero
Idle 0.3-0.5
Wide Open Throttle (WOT) 4.5
Maximum 5.0
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