P1705 obd2 code and testing tps voltage circuit

P1705 obd2 code describes the operation of the tps sensor and its wiring circuit.

P1705 excessively high or low voltage input from TPS sensor

When testing a tps sensor code like this P1705 code, check the signal wire voltage for any signs of glitch. This can be done manually without running the engine. With key on engine off, monitor the signal wire voltage from idle (close throttle) and up to high idle (WOT or wide open throttle position) by moving the throttle linkage.

The transistion from idle to high idle should be reflected in the voltage readings like a gradually increasing pattern. If there is a sudden change or a glitch, replace the TPS sensor. Please note also that a regular tps sensor usually has 3 wires: a voltage reference wire, a signal wire and a ground wire. Except the signal wires, the other 2 wires should have steady voltage readings regardless of the throttle linkage position.

For advance testing, garages can usually monitor the voltage of the TPS signal wire while the engine is running. Using a special scanner, the voltage can be watched while cruising in order to see if the value of the signal wire voltage will change.

This is particularly important if the code P1705 only appears intermittently. For precaution, check the integrity of the signal wires from the TPS sensor plug-in up to 12 inches away. To do this, splice the wiring harness and check if there is any short (bump) in the signal wire which could be rubbing metal before this code came on.

tps sensor test

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