DTC P2401, P2402
DTC P2401: Evaporative Emission (EVAP) Leak Check Pump Control Circuit Low Voltage
DTC P2402: Evaporative Emission (EVAP) Leak Check Pump Control Circuit High Voltage
General Description
The EVAP leak check module vacuum pump is installed in the EVAP leak check module to create negative pressure in the EVAP passage when performing the EVAP leak check. The vacuum pump is normally non-energized and inactive. It is only activated when performing the EVAP leak check. The powertrain control module (PCM) detects a malfunction and stores a DTC when the diagnostic signal of the driver IC of the PCM internal circuit is low continuously for the prescribed time though operation signal is output to the EVAP leak check module vacuum pump.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 2.0 seconds or more |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| Battery voltage [Battery] | 10 V | - |
[ ]: HDS Parameter
Malfunction Threshold
DTC: P2401
When the diagnostic signal of the driver IC of the PCM internal circuit is low continuously for 2.0 seconds or more while the operation signal is output to the EVAP leak check module vacuum pump.
DTC: P2402
When the diagnostic signal of the driver IC of the PCM internal circuit is high continuously for 2.0 seconds or more while the operation signal is output to the EVAP leak check module vacuum pump.
Possible Cause
DTC: P2401
- EVAP leak check module VMOTOR line short
- PCM internal circuit failure
DTC: P2402
- EVAP leak check module VMOTOR line open
- EVAP leak check module ground line open
- EVAP leak check module VMOTOR line short to power
- EVAP leak check module ground line short to power
- PCM internal circuit failure
Confirmation Procedure
Operating Condition
Turn the vehicle to the ON mode.
With the HDS
Select the EVAP TEST in the INSPECTION MENU, then select the FUNCTION TEST with the HDS.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.