Throttle Position Sensor
Throttle Position Sensor Guide
This page provides detailed information about the Throttle Position Sensor (TPS) used in the Honda RC51, including its specifications, connector details, visual references, and technical documentation.
TPS Description and Ohm Readings
The Honda RC51 (RVT1000R) uses a single Throttle Position Sensor (TPS) mounted on the throttle body to monitor the throttle valve position. The TPS is a potentiometer that sends a variable voltage signal to the ECU, indicating throttle opening angle, which is critical for fuel delivery and ignition timing. The TPS is connected via the fuel injector sub-harness.
The resistance (ohm readings) of the TPS is essential for verifying its functionality. Using a multimeter across the sensor terminals, the expected readings are:
| Measurement | Resistance (Ohms) | Notes |
|---|---|---|
| Between VCC and GND (total resistance) | approx. 5.05 kΩ | Measure at room temperature (approx. 20°C). |
| Between Signal and GND (variable) | approx. 0.870 kΩ (closed) – approx. 5.07 kΩ (open) | Varies with throttle position; fully closed to fully open. |
The ohm readings are just for referance. You will calibrate the TPS in FT Manager when setting up the base tune.
Connector Data
The TPS on the Honda RC51 uses a Sumitomo 3-pin connector integrated into the fuel injector sub-harness. (Note, the TPS uses the same connetor as the MAP sensor) See the table below for specific TPS and connector type information:
| Property | Details |
|---|---|
| Connector Type | Sumitomo 6189-0154, HW Sealed Series (3-pin) |
| Pin Configuration | Pin A: +5V (VCC), Pin B: Signal Output, Pin C: Sensor Ground |
| Wire Gauge | A: 20 AWG | B: 22 AWG | C: 20 AWG |
Note: Proper pin assignment is critical for the TPS, as incorrect connections can lead to erratic ECU readings. Always verify pin assignments with the RC51 service manual to ensure proper connection to the sub-harness. See the FI Sub-Harness page for a wiring diagram.
Sourcing the TPS Connector
You can source the connector for the TPS from the following locations:
You can find more specifications about the connector hereImages of the TPS
The following images show the Throttle Position Sensor used in the Honda RC51, including close-ups of the sensor body and connector:
Wire Diagram
Below is the symbol I used for my wiring diagram to represent the TPS and its connector:
Reference Technical Documents
The following technical documents provide additional information on the Honda RC51 TPS, connectors, and related systems:
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