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DTC P2401 [13B-MSP]

DIAGNOSTIC PROCEDURE

DTC P2401 EVAP system leak detection pump control circuit low
DETECTION CONDITION 
  • The PCM monitors the pump load current (EVAP line pressure) when the evaporative leak monitor is operating. If the pump load current is less than the specification, the PCM determines that the EVAP system leak detection pump control circuit voltage is low.

    Diagnostic support note 

  • This is an intermittent monitor (EVAP system.)
  • 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 is available.
  • The DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • Connector or terminal malfunction
  • Open circuit in wiring harness between main relay terminal C and EVAP system leak detection pump terminal A
  • Short to ground in wiring harness between main relay terminal C 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
  • EVAP system leak detection pump malfunction
  • Open circuit in wiring harness between EVAP system leak detection pump terminal D and PCM terminal 1U
  • PCM malfunction
G05982368Courtesy of MAZDA MOTORS CORP.
DTC REFERENCE CHART

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED 
  • Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (EVAP system related) been recorded?
 Yes Go to the next step.
No Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Service Bulletins and/or on-line repair information availability.
  • Is any related repair information available?
 Yes Perform repair or diagnosis according to the available repair information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3 INSPECT EVAP SYSTEM LEAK DETECTION PUMP CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect the EVAP system leak detection pump connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion.)
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 9.
No Go to the next step.
4 INSPECT EVAP SYSTEM LEAK DETECTION PUMP POWER CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND 
  • Turn the ignition switch to the ON position (engine off.)
  • Measure the voltage between EVAP system leak detection pump terminal A (wiring harness-side) and body ground.
  • Is the voltage B+  ?
 Yes Go to the next step.
No Repair or replace the wiring harness for a possible open circuit or short to ground, then go to Step 9.
5 INSPECT EVAP SYSTEM LEAK DETECTION PUMP CONTROL CIRCUIT FOR SHORT TO GROUND 
  • Turn the ignition switch off.
  • Disconnect the PCM connector.
  • Inspect for continuity between EVAP system leak detection pump terminal D (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Repair or replace the wiring harness for a possible short to ground, then go to Step 9.
No Go to the next step.
6 INSPECT EVAP SYSTEM LEAK DETECTION PUMP  Yes Replace the EVAP system leak detection pump, then go to Step 9. (See EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM REMOVAL/INSTALLATION [13B-MSP] .)
No Go to the next step.
7 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect the PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion.)
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 9.
No Go to the next step.
8 INSPECT EVAP SYSTEM LEAK DETECTION PUMP CONTROL CIRCUIT FOR OPEN CIRCUIT 
  • Turn the ignition switch off.
  • Inspect for continuity between EVAP system leak detection pump terminal D (wiring harness-side) and PCM terminal 1U (wiring harness-side.)
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace the wiring harness for a possible open circuit, then go to the next step.
9 VERIFY TROUBLESHOOTING OF DTC P2401 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the M-MDS.
  • Perform the evaporative system test using the M-MDS. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP] )
  • Is the same DTC present?
    NOTE:
    • If the evaporative system test function is not available, perform the following procedure.
  • Perform the DRIVE MODE 6. (See OBD-II DRIVE MODE [13B-MSP] )
  • Is the PENDING CODE the same as the DTC present?
 Yes Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [13B-MSP] .)
No Go to the next step.
10 VERIFY AFTER REPAIR PROCEDURE  Yes Go to the applicable DTC inspection. (See DTC TABLE [13B-MSP] .)
No DTC troubleshooting completed.
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