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Home >> Land Rover >> 2000 >> Range Rover Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - With Codes >> Diagnostic Tests (BOSCH) >> DTC P0120, P0122, P0123: Throttle Position (TP) Sensor Circuit >> Diagnosis & Repair
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Diagnosis & Repair

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 appropriate wiring diagram in WIRING DIAGRAMS article. See Figure, Figure and Fig 1 . If no problems are found, go to next step. Perform repairs as necessary. When repairs are complete, go to step  3.
  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. If voltage is as specified and changes smoothly, go to next step. If voltage is not as specified, replace TP sensor. When repairs are complete, go to next step.
  3. When DTC P0101, P0120, P0122 or P0123 repairs are completed, perform REPAIR CONFIRMATION DRIVE CYCLE "A" .
THROTTLE POSITION SENSOR SIGNAL VOLTAGE

Position Volts
Minimum Zero
Idle 0.3-0.5
Wide Open Throttle (WOT) 4.5
Maximum 5.0
Fig 1: Identifying IAC Valve, TP Sensor & CKP Sensor 3-Pin Connector Terminals
G99B52655Courtesy of LAND ROVER NORTH AMERICA, INC.
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