P2404 - Evaporative Emission System (EVAP) Leak Detection Pump Sense Range/Performance
System
Powertrain (Engine & Gearbox)
Technical Description
The control module has detected a fault in the Evaporative Emission System (EVAP) Leak Detection Pump Sense Range/Performance (P2404). The reported signal is electrically valid but disagrees with other operating parameters (RPM, load, or other sensors).
Multimeter Test Points & Nominal Values
| Test Point / Component | Measurement | Nominal Target Range | Test Condition |
|---|---|---|---|
| Evaporative Emission System (EVAP) Leak Detection Pump Sense Range/Performance – Coil Resistance | Resistance (Ω) | 3 - 30 Ω (typical) | Connector disconnected at 20°C |
| Evaporative Emission System (EVAP) Leak Detection Pump Sense Range/Performance – Duty Cycle | PWM (%) | 5 - 95 % (modulates with target) | Engine running, actuator in control |
| Evaporative Emission System (EVAP) Leak Detection Pump Sense Range/Performance – Supply Voltage | Voltage (V) | 11.8 - 14.4 V | Ignition ON at connector |
Connector disconnected at 20°C
Engine running, actuator in control
Ignition ON at connector
Oscilloscope Waveform Analysis
2 ms/div, 20 V/divPossible Causes
Evaporative Emission System (EVAP) Leak Detection Pump Sense Range/Performance is electrically operational but performing outside calibrated tolerance
Chafed or pinched wiring harness along the signal path to Evaporative Emission System (EVAP) Leak Detection Pump Sense Range/Performance
Internal mechanical wear or carbon deposits inside Evaporative Emission System (EVAP) Leak Detection Pump Sense Range/Performance
Defective internal output driver or reference circuit in the control module for Evaporative Emission System (EVAP) Leak Detection Pump Sense Range/Performance
Symptoms
Recommended Solution
Log component live data across varying load points and verify plausibility against engine target model.
Verify loaded supply voltage and harness terminal pins at Evaporative Emission System (EVAP) Leak Detection Pump Sense Range/Performance.
Check circuit continuity and ground-side voltage drop (< 0.05 V) for Evaporative Emission System (EVAP) Leak Detection Pump Sense Range/Performance.
Check supply and the low-side driver at the ECM connector. Replace the actuator or repair the circuit based on the readings.
Mechanic's Tip
Use the scan-tool output test with the scope on the control side at the same time. If duty changes but the actuator does not move, the valve is stuck — not the electrical fault you were chasing.
Related Fault Codes
Exhaust Temperature Too Low For Particulate Filter Regeneration (Bank 2)
Oxygen Sensor (O2) Signals Swapped Bank 2 Sensor '2' / Bank 2 Sensor '3'
Evaporative Emission System (EVAP) Leak Detection Pump Pressure Sensor Range/Performance
Exhaust Gas Temperature Sensor (EGT) Circuit (Bank 1 Sensor '3')