DTC P2404: EVAP System Leak Detection Pump Sense Circuit Range/Performance [11/2021 - ]: Procedure

1. Turn the ignition switch to ON.
2. Using GTS or a general scan tool, read the DTC of [Engine].

   Powertrain > Engine Control System > Trouble Codes 

   Is DTC other than P2404 displayed? (Current code)

   Result	Proceed to
   Yes (Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)".)	A
   No	B

Result: 

A 

CHECK APPROPRIATE DTC 

Result: 

B 

See step  2

1. Using GTS, select [ELCM pump] of [Active Test] and operate the vacuum pump of the canister pump module.

   Powertrain > Engine Control System > Active Test 

   Tester Display
   ELCM pump

   Does the vacuum pump of the canister pump module operate?

   Result	Proceed to
   Yes	A
   No	B

Result: 

B 

See step  8

Result: 

A 

See step  3

1. Using GTS, select [ELCM switching valve] of [Active Test] and operate the switching valve of the canister pump module.

   Powertrain > Engine Control System > Active Test 

   Tester Display
   ELCM switching valve

   Does the switching valve of the canister pump module operate?

   Result	Proceed to
   Yes	A
   No	B

Result: 

B 

See step  5

Result: 

A 

See step  4

1. Perform the corresponding inspection mode.

   Refer to SYSTEM NORMAL CONDITION CHECK [11/2021 - 06/2022] , or refer to SYSTEM NORMAL CONDITION CHECK [06/2022 - 12/2023] , or refer to SYSTEM NORMAL CONDITION CHECK [12/2023 - 10/2024] , or refer to SYSTEM NORMAL CONDITION CHECK [10/2024 - ]

   Is DTC P2404 displayed? (Current code)

   Result	Proceed to
   Yes (Replace the canister pump module.)	A
   No (Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.) HINT:  In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.	B

Result: 

A 

REPLACE CANISTER PUMP MODULE 

Refer to PROCEDURE - Step 5

Result: 

B 

PERFORM SIMULATION TEST 

1. Turn the ignition switch to OFF.
2. Disconnect the connector from the canister pump module.
3. Turn the ignition switch to ON.
4. Measure the voltage between the canister pump module connector and chassis ground.

   Connector & terminal

   M23-5 - Chassis ground

   Is the voltage 10 V or higher?

   Result	Proceed to
   Yes	A
   No (Repair the following item.) Open circuit in harness between No. 1 engine room relay block and No. 1 junction block assembly and the canister pump module connector Poor contact of coupling connector Poor contact of J/C Blown out of fuse	B

Result: 

B 

REPAIR RELATED PARTS 

Result: 

A 

See step  6

1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Measure the resistance of harness between ECM connector and the canister pump module connector.

   Connector & terminal

   B1-26 (VPMP) - M23-1

   Is the resistance less than 1 Ω?

   Result	Proceed to
   Yes	A
   No(Repair the following item.) Open circuit in harness between ECM connector and the canister pump module connector Poor contact of coupling connector	B

Result: 

B 

REPAIR RELATED PARTS 

Result: 

A 

See step  7

1. Measure the resistance of harness between ECM connector and engine ground.

   Connector & terminal

   B1-26 (VPMP) - Engine ground

   Is the resistance 1 MΩ or more?

   Result	Proceed to
   Yes (Replace the leak check valve assembly.)	A
   No (Repair the short circuit to ground in harness between ECM connector and canister pump module connector.)	B

Result: 

A 

REPLACE CANISTER PUMP MODULE 

Refer to PROCEDURE - Step 5

Result: 

B 

REPAIR HARNESS OR CONNECTOR 

1. Turn the ignition switch to OFF.
2. Disconnect the connector from the canister pump module.
3. Turn the ignition switch to ON.
4. Measure the voltage between the canister pump module connector and chassis ground.

   Connector & terminal

   M23-3 - Chassis ground

   Is the voltage 10 V or higher?

   Result	Proceed to
   Yes	A
   No (Repair the following item.) Open circuit in harness between No. 1 engine room relay block and No. 1 junction block assembly and the canister pump module connector Blown out of fuse Poor contact of J/C Poor contact of coupling connector	B

Result: 

B 

REPAIR RELATED PARTS 

Result: 

A 

See step  9

1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Measure the resistance of harness between ECM connector and the canister pump module connector.

   Connector & terminal

   B1-25 (MPMP) - M23-4

   Is the resistance less than 1 Ω?

   Result	Proceed to
   Yes	A
   No (Repair the following item.) Open circuit in harness between ECM connector and the canister pump module connector Poor contact of coupling connector	B

Result: 

B 

REPAIR RELATED PARTS 

Result: 

A 

See step  10

1. Measure the resistance of harness between ECM connector and engine ground.

   Connector & terminal

   B1-26 (VPMP) - Engine ground

   Is the resistance 1 MΩ or more?

   Result	Proceed to
   Yes (Replace the canister pump module.)	A
   No (Repair the short circuit to ground in harness between ECM connector and canister pump module connector.)	B

Result: 

A 

REPLACE CANISTER PUMP MODULE 

Refer to PROCEDURE - Step 5

Result: 

B 

REPAIR HARNESS OR CONNECTOR