Testing - Ford Ranger Maintaince And Repair Manual

Typical Throttle Position (TP) sensor mounting on the throttle body

TESTING

1. Disconnect the negative battery cable.
2. Disengage the wiring harness connector from the TP sensor.
3. Using a Digital Volt−Ohmmeter (DVOM) set on ohmmeter function, probe the terminals, which
correspond to the Brown/White and the Gray/White connector wires, on the TP sensor. Do not
measure the wiring harness connector terminals, rather the terminals on the sensor itself.
4. Slowly rotate the throttle shaft and monitor the ohmmeter for a continuous, steady change in
resistance. Any sudden jumps, or irregularities (such as jumping back and forth) in resistance
indicates a malfunctioning sensor.
5. Reconnect the negative battery cable.
6. Turn the DVOM to the voltmeter setting.
Ensuring the DVOM is on the voltmeter function is vitally important, because if you measure circuit
resistance (ohmmeter function) with the battery cable connected, your DVOM will be destroyed.
7. Detach the wiring harness connector from the PCM (located behind the lower right−hand kick panel
in the passengers' compartment), then install a break−out box between the wiring harness connector
and the PCM connector.
8. Turn the ignition switch ONand using the DVOM on voltmeter function, measure the voltage
between terminals 89 and 90 of the breakout box. The specification is 0.9 volts.
9. If the voltage is outside the standard value or if it does not change smoothly, inspect the circuit wiring
and/or replace the TP sensor.
OPERATION
HOW TO USE THIS BOOK
WARNING
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