Toyota Tundra. Manual — part 1212

P0451: Canister pressure sensor noise

TYPICAL MALFUNCTION THRESHOLDS

P0451: Canister pressure sensor fixed/flat

TYPICAL MALFUNCTION THRESHOLDS

P0452: Canister pressure sensor low voltage

TYPICAL MALFUNCTION THRESHOLDS

P0453: Canister pressure sensor high voltage

TYPICAL MALFUNCTION THRESHOLDS

WIRING DIAGRAM

Fig. 156: Evaporative Emission Control System Pressure Sensor Range/Performance Wiring Diagram

INSPECTION PROCEDURE

Frequency that EVAP pressure change 0.3 kPa-g (2.25 mmHg-g) or more 10 times or more in 10 seconds

EVAP pressure change during reference pressure

Less than 0.65 kPa-g (4.87 mmHg-g)

EVAP pressure

Less than 42.1 kPa-a (315.9 mmHg-a)

EVAP pressure

More than 123.8 kPa-a (928.4 mmHg-a)

NOTE:



When a vehicle is brought into the workshop, leave it as it is. Do not
change the vehicle condition. For example, do not tighten the fuel cap.



Do not disassemble the canister pump module.



The Techstream is required to conduct the following diagnostic
troubleshooting procedure.

2008 Toyota Tundra

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

1. CONFIRM DTC AND EVAP PRESSURE

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON (do not start the engine).

c. Turn the Techstream ON.

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

e. Read DTCs.

f. Enter the following menus: Powertrain/Engine and ECT/Data List/EVAP/Vapor Pressure Pump.

g. Read the EVAP (Evaporative Emission) pressure displayed on the Techstream.

Result

RESULT CHART

B : Go to step 4

C : GO TO EVAP SYSTEM

A : Go to next step.

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

a. Turn the ignition switch OFF.

b. Disconnect the D74 ECM connector.

c. Measure the resistance between PPMP terminal of the ECM connector and the body ground.

Display (DTC

Output)

Test Result

Suspected Trouble Area

Proceed

To

P0451

-

Canister pressure sensor

C

P0452

Less than 45 kPa-a

(430 mmHg-a)



Wire harness/connector (ECM -
Canister pressure sensor)



Canister pressure sensor



Short in ECM circuit

A

P0453

More than 120 kPa-a

(900 mmHg-a)



Wire harness/connector (ECM -
Canister pressure sensor)



Canister pressure sensor



Open in ECM circuit

B

2008 Toyota Tundra

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

Fig. 157: Identifying D74 ECM Connector Terminals

Result

RESULT CHART

B : Go to step 7

A : Go to next step.

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

a. Disconnect the R1 canister pump module connector.

b. Disconnect the D74 ECM connector.

c. Measure the resistance between PPMP terminal of the ECM connector and the body ground.

Test Result

Suspected Trouble Area

Proceed To

10 ohms or less



Wire harness/connector (ECM - Canister pressure sensor)



Short in canister pressure sensor circuit

A

10 kohms or more



Wire harness/connector (ECM - Canister pressure sensor)



Short in ECM circuit

B

2008 Toyota Tundra

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

Fig. 158: Identifying D74 ECM Connector Terminal (PPMP)

Result

RESULT CHART

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.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

Test Result

Suspected Trouble Area

Proceed To

10 kohms or more Short in canister pressure sensor circuit

A

10 ohms or less Short in wire harness/connector (ECM - Canister pressure sensor)

B

Tester Connection

Switch Condition Specified Condition

2008 Toyota Tundra

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