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• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
---|---|---|---|
B+ | P2400, P2419 | P2400, P2418 | - |
Evaporative Emission System Leak Detection Pump Control | P2401 | P2400 | P2402 |
The evaporative emission (EVAP) system uses an EVAP leak detection pump to test for system leaks. The EVAP leak detection pump assembly consists of the following components:
• | EVAP leak detection pump with reference orifice |
• | EVAP leak detection pump switching valve |
• | EVAP leak detection pump pressure sensor |
The ECM commands the EVAP leak detection pump control circuit through an internal switch called a driver. The ECM monitors the commanded and actual status of the driver. If the ECM detects they do not match a DTC sets.
• | The vehicle is ON. |
• | P2400, P2401 and P2402 run continuously when the above conditions are met. |
The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for a minimum of 5 s.
DTCs P2400, P2401 and P2402 are Type B DTCs.
DTCs P2400, P2401 and P2402 are Type B DTCs.
• | The EVAP leak detection pump is very quiet. You might feel it running rather than hear it. |
• | The devices have to be in their commanded state. |
• | Where multiple DTCs set look for a common root cause like battery feeds, grounds, splices, etc. |
Evaporative Emission Control System Description
Hybrid Modes of Operation Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
Note: This EVAP leak detection pump is very quiet. You might feel it running rather than hear it.
• | EVAP Leak Detection Pump Output Circuit High Voltage Test Status |
• | EVAP Leak Detection Pump Output Circuit Open Test Status |
• | EVAP Leak Detection Pump Output Circuit Low Voltage Test Status |
Each parameter should display OK or Not Run. |
⇒ | If the test lamp does not illuminate, test the battery circuit for a short to ground or an open/high resistance. If the circuit tests normal and the battery circuit fuse is open, test all components connected to the battery circuit and replace as necessary. |
⇒ | If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the K20 ECM. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM. |
⇒ | If not the specified values, replace the K20 ECM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |
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