DTC P0123-00: TP Sensor No. 1 Circuit High Input: Notes

DTC DETECTION DESCRIPTION

DTC P0123:00	TP sensor No. 1 circuit high input
DETECTION CONDITION	If the PCM detects that the TP sensor No. 1 voltage at the PCM terminal 1BP is above 4.9 V, the PCM determines that the TP sensor No. 1 circuit has a malfunction. Diagnostic support note This is a continuous monitor (CCM). The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA/Snapshot data is available. DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Restricts the upper limit of the engine speed. PCM restricts engine torque.
POSSIBLE CAUSE	Throttle body connector or terminals malfunction PCM connector or terminals malfunction TP sensor No. 1 malfunction Short to power supply in wiring harness between throttle body terminal A and PCM terminal 1BP Open circuit in wiring harness between the following terminals: Throttle body terminal B-PCM terminal 1BS Throttle body terminal A-PCM terminal 1BP Throttle body terminal D-PCM terminal 1BQ PCM malfunction

Fig 1: TP Sensor No 1 (Throttle Body) Circuit Diagram

Courtesy of MAZDA MOTORS CORP.

CAUTION:

• Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.

PARTS DESCRIPTION

Item	Definition	Unit	Condition/Specification
TP1	Throttle valve position No. 1	%	Accelerator pedal released: Approx. 22% Accelerator pedal fully depressed: Approx. 92%
	TP sensor No. 1 voltage	V	Accelerator pedal released: Approx. 1.11 V Accelerator pedal fully depressed: Approx. 4.59 V