DTC P0123 [LF]: Notes

DTC P0123 (LF) DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0123	TP sensor No. 1 circuit high input
DETECTION CONDITION	If the PCM detects the TP sensor No. 1 voltage is to be above 4.9 V after ignition switch to the ON position, the PCM determines that the TP sensor No. 1 circuit has a malfunction. Diagnostic support note This is a continuous monitor (CCM). The MIL illuminates if the PCM detects the above malfunction condition during first drive cycle. FREEZE FRAME DATA (Mode 2/Mode 12) is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	Throttle body connector or terminals malfunction PCM connector or terminals malfunction Short to power supply circuit in wiring harness between throttle body terminal F and PCM terminal 2AK TP sensor No. 1 power supply circuit and signal circuit are shorted to each other Open circuit in wiring harness between throttle body terminal F and PCM terminal 2AK Open circuit in wiring harness between throttle body terminal C and PCM terminal 2AP TP sensor No. 1 malfunction PCM malfunction
Courtesy of MAZDA MOTORS CORP.

DTC P0123

TP sensor No. 1 circuit high input

DETECTION CONDITION

If the PCM detects the TP sensor No. 1 voltage is to be above 4.9 V after ignition switch to the ON position, the PCM determines that the TP sensor No. 1 circuit has a malfunction.

Diagnostic support note

This is a continuous monitor (CCM).
The MIL illuminates if the PCM detects the above malfunction condition during first drive cycle.
FREEZE FRAME DATA (Mode 2/Mode 12) is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

Throttle body connector or terminals malfunction
PCM connector or terminals malfunction
Short to power supply circuit in wiring harness between throttle body terminal F and PCM terminal 2AK
TP sensor No. 1 power supply circuit and signal circuit are shorted to each other
Open circuit in wiring harness between throttle body terminal F and PCM terminal 2AK
Open circuit in wiring harness between throttle body terminal C and PCM terminal 2AP
TP sensor No. 1 malfunction
PCM malfunction

Courtesy of MAZDA MOTORS CORP.