DTC P0123:00 [L5]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITIONS & POSSIBLE CAUSES

DTC P0123:00	TP sensor No. 1 circuit high input
DETECTION CONDITION	If the PCM detects the TP sensor No. 1 voltage is to be above 4.85 V after switch the ignition to ON, PCM determines that TP circuit has a malfunction. Diagnostic support note This is a continuous monitor (CCM). The MIL illuminates if the PCM detects the above malfunction condition in first drive cycle. FREEZE FRAME DATA is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	Throttle body connector or terminal malfunction PCM connector or terminal malfunction Short to power supply circuit in wiring harness between throttle body terminal A and PCM terminal 2AK Short circuit in TP sensor No. 1 signal circuit and power supply circuit each other TP sensor No. 1 malfunction Open circuit in wiring harness between throttle body terminal D and PCM terminal 2AP PCM malfunction
Courtesy of MAZDA MOTORS CORP.

DTC P0123:00

TP sensor No. 1 circuit high input

DETECTION CONDITION

If the PCM detects the TP sensor No. 1 voltage is to be above 4.85 V after switch the ignition to ON, PCM determines that TP circuit has a malfunction.

Diagnostic support note

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

POSSIBLE CAUSE

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

Courtesy of MAZDA MOTORS CORP.