DTC P2128 [L3]: Notes

WARNING: This page is about a different car, the 2008 Mazda 5. However, it is still accessible from the selected car via links, so may be relevant.

DTC P2128 [L3] DETECTION CONDITIONS AND POSSIBLE CAUSES

DTC P2128	Accelerator pedal position (APP) sensor No.2 circuit high input
DETECTION CONDITION	The PCM monitors the input voltage from APP sensor No.2 when the engine is running. If the input voltage is above 7.2 V for 1s, the PCM determines that the APP sensor No.2 circuit has malfunction. Diagnostic support note This is a continuous monitor (CCM). MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	APP sensor No.2 malfunction Connector or terminal malfunction Open circuit in wiring harness between APP sensor terminal F and main relay Open circuit in wiring harness between APP sensor terminal D and body ground Open circuit in wiring harness between APP sensor terminal E and PCM terminal 1AO Short to power supply in wiring harness between APP sensor terminal E and PCM terminal 1AO PCM malfunction

DTC P2128

Accelerator pedal position (APP) sensor No.2 circuit high input

DETECTION CONDITION

The PCM monitors the input voltage from APP sensor No.2 when the engine is running. If the input voltage is above 7.2 V for 1s, the PCM determines that the APP sensor No.2 circuit has malfunction.

Diagnostic support note

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

POSSIBLE CAUSE

APP sensor No.2 malfunction
Connector or terminal malfunction
Open circuit in wiring harness between APP sensor terminal F and main relay
Open circuit in wiring harness between APP sensor terminal D and body ground
Open circuit in wiring harness between APP sensor terminal E and PCM terminal 1AO
Short to power supply in wiring harness between APP sensor terminal E and PCM terminal 1AO
PCM malfunction