Toyota Tundra. Manual — part 1264

Fig. 248: Identifying D74 ECM Connector & D30 Purge VSV Connector

19. INSPECT CANISTER PUMP MODULE (POWER SOURCE FOR VENT VALVE)

a. Turn the ignition switch OFF.

b. Disconnect the R1 canister pump module connector.

c. Turn the ignition switch ON.

d. Measure the voltage between VLVB terminal of the canister pump module connector and the body

ground.

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Fig. 249: Inspecting Canister Pump Module (Power Source For Vent Valve)

Result

RESULT CHART

B : Go to step 31

A : Go to next step.

20. INSPECT CANISTER PUMP MODULE (VENT VALVE OPERATION)

a. Turn the ignition switch OFF.

b. Disconnect the R1 canister pump module connector.

c. Apply the battery voltage to VLVB and VGND terminals of the canister pump module.

Test Result

Suspected Trouble Area

Proceed To

11 to 14 V

1. Wire harness between vent valve and ECM

2. Vent valve

3. ECM

A

Below 3 V Power source wire harness of vent valve

B

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

d. Touch the canister pump module to confirm the vent valve operation.

Fig. 250: Identifying R1 Canister Pump Module Connector Terminals

Result

RESULT CHART

B : Go to step 29

A : Go to next step.

21. CHECK HARNESS AND CONNECTOR (ECM - CANISTER PUMP MODULE)

a. Disconnect the A24 ECM connector.

b. Disconnect the R1 canister pump module connector.

c. Measure the resistance between VPMP terminal of the ECM connector and VGND terminal of the

canister pump module connector.

Test Result

Suspected Trouble Area

Proceed To

Operating

1. Wire harness between vent valve and ECM

2. ECM

A

Not operating Vent valve

B

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Fig. 251: Identifying R1 Canister Pump Module Connector & A24 ECM Connector
Terminals

Result

RESULT CHART

A : Go to step 34

B : Go to step 31

22. PERFORM ACTIVE TEST USING TECHSTREAM (FOR LEAK DETECTION PUMP)

a. Turn the ignition switch OFF.

b. Disconnect the R1 canister pump module connector.

c. Turn the ignition switch ON.

d. Enter the following menus: Powertrain/Engine and ECT/Active Test/Activate the Vacuum Pump.

e. Measure the voltage between terminal MPMP of the ECM connector and the body ground when the

leak detection pump is turned ON and OFF using the Techstream.

Test Result

Suspected Trouble Area

Proceed To

Below 1 ohms

ECM

A

10 kohms or higher Wire harness between ECM and canister pump module B

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra