Toyota Tundra. Manual — part 1576

A: Go to step 5

B: Go to step 6

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

a. Disconnect the R1 canister pump module connector.

Fig. 179: Identifying Terminals Of R1 Canister Pump Module Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFIED CONDITION

c. Turn the ignition switch to ON.

d. Measure the voltage according to the value(s) in the table below.

Standard voltage

VOLTAGE SPECIFIED CONDITION

Result

RESULT REFERENCE

Tester Connection

Condition Specified Condition

R1-2 (SGND) - Body ground Always

100 ohms or less

Tester Connection

Switch Condition Specified Condition

R1-4 (VCC) - Body ground

Ignition switch ON

4.5 to 5.5 V

R1-3 (VOUT) - Body ground Ignition switch ON

4.5 to 5.5 V

Test Result

Suspected Trouble Area

Proceed

to

Voltage and resistance within
standard ranges

Open in canister pressure sensor circuit

A

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

B: Go to step 6

A: Go to Next Step

5. REPLACE CHARCOAL CANISTER ASSEMBLY

a. Replace the canister assembly (see REMOVAL ).

Fig. 180: Identifying Fuel Tank Vent Hose And Air Inlet Port
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NEXT: Go to step 8

6. REPAIR OR REPLACE HARNESS OR CONNECTOR

HINT:

If the exhaust tailpipe has been removed, go to the next step before reinstalling it.

NEXT: Go to step 8

7. REPLACE ECM

a. Replace the ECM (see REMOVAL ).

8. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON and turn the Techstream ON.

c. Wait for at least 60 seconds.

Voltage and resistance outside
standard ranges

Open in wire harness/connector (ECM - Canister
pressure sensor)

B

NOTE:

When replacing the canister, check the canister pump module
interior and related pipes for water, fuel and other liquids. If liquids
are present, check for disconnections and/or cracks in the following:
1) the pipe from the air inlet port to the canister pump module; 2) the
canister filter; and 3) the fuel tank vent hose.

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

d. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes/Pending.

HINT:

If no pending DTCs are displayed on the Techstream, the repair has been successfully completed.

NEXT: COMPLETED

DTC P0455 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED (GROSS LEAK);
DTC P0456 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED (VERY SMALL
LEAK)

DTC SUMMARY

DTC SUMMARY

DTC

Monitoring

Item

Malfunction

Detection

Condition

Trouble Area

Detection

Timing

Detection Logic

P0455

EVAP gross leak

Leak detection
pump creates
negative pressure
(vacuum) in
EVAP system
and EVAP
system pressure
measured.
Reference
pressure
measured at start
and at end of leak
check.
If stabilized
pressure higher
than [second
reference
pressure x 0.2],
ECM determines
that EVAP
system has large
leak.



Fuel tank
cap (loose)



Leakage
from EVAP
line
(Canister -
Fuel tank)



Leakage
from EVAP
line (Purge
VSV -
Canister)



Canister
pump
module



Leakage
from fuel
tank



Leakage
from
canister

While ignition
switch off

2 trip

Leak detection
pump creates
negative pressure
(vacuum) in
EVAP system
and EVAP



Fuel tank
cap (loose)



Leakage
from EVAP
line
(Canister -

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

DESCRIPTION

The description can be found in the EVAP (Evaporative Emission) System (See DESCRIPTION ).

INSPECTION PROCEDURE

Refer to the EVAP SYSTEM .

MONITOR DESCRIPTION

5 hours* after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in
the EVAP system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.

HINT:

*: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the ignition switch is turned off, the
monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the ignition switch is turned
off, the monitor check starts 2.5 hours later.

MONITOR DESCRIPTION

P0456

EVAP small leak

system pressure
measured.
Reference
pressure
measured at start
and at end of leak
check.
If stabilized
pressure higher
than second
reference
pressure, ECM
determines that
EVAP system
has small leak.

Fuel tank)



Leakage
from EVAP
line (Purge
VSV -
Canister)



Canister
pump
module



Leakage
from fuel
tank



Leakage
from
canister

While ignition
switch off

2 trip

Sequence

Operation

Description

Duration

-

ECM activation

Activated by soak timer 5, 7 or 9.5 hours after ignition switch
turned off.

-

A

Atmospheric
pressure
measurement

Vent valve turned OFF (vent) and EVAP system pressure
measured by ECM in order to register atmospheric pressure.
If pressure in EVAP system not between 70 kPa-a and 110
kPa-a (525 mmHg-a and 825 mmHg-a), ECM cancels EVAP
system monitor.

10

seconds

First reference

In order to determine reference pressure, leak detection pump
creates negative pressure (vacuum) through reference orifice

60

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra