DTC P2401 [LF]: Notes

DTC P2401 (LF) DETECTION CONDITION AND POSSIBLE CAUSE

DTC P2401	EVAP system leak detection pump motor circuit low input
DETECTION CONDITION	The PCM monitors pump load current (EVAP line pressure), while evaporative leak monitor is operating. If the pump load current is lower than specified, the PCM determines the EVAP system leak detection pump motor circuit has a malfunction. Diagnostic support note This is an intermittent monitor (CCM). The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA (Mode 2/Mode 12) is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	EVAP system leak detection pump connector or terminals malfunction Open circuit or short to ground in EVAP system leak detection pump power supply circuit Short to ground in wiring harness between main relay and EVAP system leak detection pump terminal A EVAP system leak detection pump power supply circuit related fuse malfunction Open circuit in wiring harness between main relay and EVAP system leak detection pump terminal A Short to ground in wiring harness between EVAP system leak detection pump terminal D and PCM terminal 1U PCM connector or terminals malfunction EVAP system leak detection pump motor circuit and ground circuit are shorted to each other Open circuit in wiring harness between EVAP system leak detection pump terminal D and PCM terminal 1U EVAP system leak detection pump malfunction PCM malfunction
Courtesy of MAZDA MOTORS CORP.

DTC P2401

EVAP system leak detection pump motor circuit low input

DETECTION CONDITION

The PCM monitors pump load current (EVAP line pressure), while evaporative leak monitor is operating. If the pump load current is lower than specified, the PCM determines the EVAP system leak detection pump motor circuit has a malfunction.

Diagnostic support note

This is an intermittent monitor (CCM).
The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
FREEZE FRAME DATA (Mode 2/Mode 12) is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

EVAP system leak detection pump connector or terminals malfunction
Open circuit or short to ground in EVAP system leak detection pump power supply circuit
- Short to ground in wiring harness between main relay and EVAP system leak detection pump terminal A
- EVAP system leak detection pump power supply circuit related fuse malfunction
- Open circuit in wiring harness between main relay and EVAP system leak detection pump terminal A
Short to ground in wiring harness between EVAP system leak detection pump terminal D and PCM terminal 1U
PCM connector or terminals malfunction
EVAP system leak detection pump motor circuit and ground circuit are shorted to each other
Open circuit in wiring harness between EVAP system leak detection pump terminal D and PCM terminal 1U
EVAP system leak detection pump malfunction
PCM malfunction

Courtesy of MAZDA MOTORS CORP.