DTC P0122-00: TP Sensor No. 1 Circuit Low Input: Notes

DTC DETECTION DESCRIPTION

DTC P0122:00	TP sensor No. 1 circuit low input
DETECTION CONDITION	If the PCM detects that the TP sensor No. 1 voltage at the PCM terminal 1BP is below 0.1 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.
POSSIBLE CAUSE	Throttle body connector or terminals malfunction PCM connector or terminals malfunction Short to ground in wiring harness between the following terminals: Throttle body terminal B-PCM terminal 1BS Throttle body terminal A-PCM terminal 1BP TP sensor No. 1 signal circuit and ground circuit are shorted to each other TP sensor No. 1 malfunction 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