Toyota Tundra. Manual — part 1389

P0452 and P0453:

TYPICAL ENABLING CONDITIONS - P0452 AND P0453

TYPICAL MALFUNCTION THRESHOLDS

P0451: Canister pressure sensor noise

TYPICAL MALFUNCTION THRESHOLDS - P0451: CANISTER PRESSURE SENSOR NOISE

P0451: Canister pressure sensor fixed/flat

TYPICAL MALFUNCTION THRESHOLDS - P0451: CANISTER PRESSURE SENSOR FIXED/FLAT

P0452: Canister pressure sensor low voltage

TYPICAL MALFUNCTION THRESHOLDS - P0452: CANISTER PRESSURE SENSOR LOW
VOLTAGE

P0453: Canister pressure sensor high voltage

TYPICAL MALFUNCTION THRESHOLDS - P0453: CANISTER PRESSURE SENSOR HIGH
VOLTAGE

WIRING DIAGRAM

Monitor runs whenever following DTCs not present

None

Either of following conditions met

(a) or (b)

(a) Ignition switch

ON

(b) Soak timer

ON

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)

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

Fig. 164: Evaporative Emission Control System - Wiring Diagram

INSPECTION PROCEDURE

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 (2UZ-FE) - Tundra

1. CONFIRM DTC AND EVAP PRESSURE

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to 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 REFERENCE

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.

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 (2UZ-FE) - Tundra

Fig. 165: Identifying D74 ECM Connector

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

Result

RESULT REFERENCE

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 according to the value (s) in the table below.

Tester Connection

Test Result

Suspected Trouble Area

Proceed

To

D74-121 (PPMP) -

Body ground

10 ohms or

less



Wire harness/connector (ECM - Canister
pressure sensor)



Short in canister pressure sensor circuit

A

D74-121 (PPMP) -

Body ground

10 kohms or

higher



Wire harness/connector (ECM - Canister
pressure sensor)



Short in ECM circuit

B

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra