Toyota Tundra. Manual — part 1390

Fig. 166: Identifying D74 ECM & R1 Canister Pump Module Connectors

Result

RESULT REFERENCE

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

Standard resistance

Tester Connection

Test Result

Suspected Trouble Area

Proceed

To

D74-121 (PPMP) -

Body ground

10 kohms or

higher

Short in canister pressure sensor circuit

A

D74-121 (PPMP) -

Body ground

10 ohms or

less

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

B

2008 Toyota Tundra

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

STANDARD RESISTANCE SPECIFICATION

c. Turn the ignition switch to ON.

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

Standard voltage

STANDARD VOLTAGE SPECIFICATION

Fig. 167: Identifying ECM & R1 Canister Pump Module Connectors

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

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-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. 168: Identifying Air Inlet Port & Fuel Tank Vent Hose

NEXT : Go to step 8

To

Voltage and resistance within
standard ranges

Open in canister pressure sensor circuit

A

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 (2UZ-FE) - Tundra

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.

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

DTCs

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

While
ignition
switch off

2 trip

2008 Toyota Tundra

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