Toyota Tundra. Manual — part 1213

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Fig. 159: Identifying R1 Canister Pump Module Connector Terminals

Result

RESULT CHART

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

Tester Connection

Condition Specified Condition

R1-2 (SGND) - Body ground Always

100 ohms or less

Test Result

Suspected Trouble Area

Proceed

To

Voltage and resistance within
standard ranges

Open in canister pressure sensor circuit

A

2008 Toyota Tundra

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

B : Go to step 6

A : Go to next step.

5. REPLACE CHARCOAL CANISTER ASSEMBLY

a. Replace the canister assembly. (See CANISTER ).

Fig. 160: Identifying Charcoal Canister Assembly Components

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.

2008 Toyota Tundra

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

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 ).

NEXT : Go to step 8

8. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR)

a. Connect the Techstream to the DLC3.

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

c. Wait for at least 60 seconds.

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 CHART

DTCs

Monitoring

Item

Malfunction Detection Condition

Trouble Area

Detection

Timing

Detection

Logic

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



Fuel tank
cap (loose)



Leakage
from EVAP
line
(Canister -
Fuel tank)



Leakage
from EVAP

2008 Toyota Tundra

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

P0455

EVAP gross
leak

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.

line (Purge
VSV -
Canister)



Canister
pump
module



Leakage
from fuel
tank



Leakage
from canister

While
ignition
switch OFF

2 trip

P0456

EVAP small
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,
ECM determines that EVAP system has
small 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

2008 Toyota Tundra

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