Toyota Tundra. Manual — part 1219

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Turn the Techstream ON.

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

e. Read the DTCs.

Result

RESULT CHART

HINT:

If any DTCs other than P050A are output, troubleshoot those DTCs first.

NG : GO TO DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART )

OK : Go to next step.

2. READ VALUE USING TECHSTREAM (FUEL TRIM)

HINT:

Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter.

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Turn the Techstream ON.

d. Enter the following menus: Powertrain/Engine and ECT/Data List/A/F Control System/Short FT #1

and Long FT #1, or Short FT #2 and Long FT #2.

e. Read the values displayed on the Techstream.

f. Add together the Short FT #1 and Long FT #1, or Short FT #2) and Long FT #2 values to obtain

the total Fuel Trim

OK: Total of Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2 values is between
-20% and 20%.

NG : Go to step 5

OK : Go to next step.

3. CHECK THROTTLE BODY

Display (DTC Output) Proceed To

P050A

A

P050A and other DTCs

B

2008 Toyota Tundra

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

a. Check that there are no deposits around the throttle valve.

OK: No deposits around the throttle valve

NG : Go to step 10

OK : Go to next step.

4. REPLACE ECM

a. Replace ECM (See REMOVAL ).

NEXT : Go to step 15

5. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV)

a. Connect the Techstream to the DLC3.

b. Start the engine and turn the Techstream ON.

c. Warm up the engine.

d. Enter the following menus: Powertrain/Engine and ECT/Active Test/Control the VVT System

(Bank 1) or Control the VVT System (Bank 2).

e. Check the engine speed while operating the Oil Control Valve (OCV) using the Techstream.

OK

ACTIVE TEST CHART

NG : Go to step 11

OK : Go to next step.

6. CHECK PCV SYSTEM

a. Start the engine.

b. Pinch the positive crankcase PCV hose.

c. Check the engine RPM.

OK: The engine RPM rises when the PCV hose is pinched.

NG : Go to step 12

OK : Go to next step.

7. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

Tester Operation

Specified Condition

OCV OFF

Normal engine speed

OCV ON

Engine idles roughly or stalls (soon after OCV switched from OFF to ON)

2008 Toyota Tundra

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

a. Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil.

OK: The air cleaner filter element is not excessively contaminated with dirt or oil.

NG : Go to step 13

OK : Go to next step.

8. CHECK AIR INDUCTION SYSTEM

a. Check the air induction system for vacuum leaks.

OK: No leakage from the air induction system.

NG : Go to step 14

OK : Go to next step.

9. REPLACE MASS AIR FLOW METER

a. Replace mass air flow meter (See REMOVAL ).

NEXT : Go to step 15

10. REPAIR OR REPLACE THROTTLE BODY

a. Repair or replace throttle body (See REMOVAL ).

NEXT : Go to step 15

11. CHECK AND REPAIR VVT SYSTEM

NEXT : Go to step 15

12. REPAIR OR REPLACE PCV SYSTEM

NEXT : Go to step 15

13. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

NEXT : Go to step 15

14. REPAIR OR REPLACE AIR INDUCTION SYSTEM

NEXT : Go to step 15

15. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)

NOTE:

For this operation, the engine must be cold (the same level as the engine

2008 Toyota Tundra

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

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Turn the Techstream ON.

d. Clear the DTCs (See DTC CHECK/CLEAR ).

e. Switch the ECM from normal mode to check mode using the Techstream (See CHECK MODE

PROCEDURE ).

f. Start the engine and idle it for 1 minute.

OK: Stable fast idle

g. Read the DTCs.

OK: No DTC is output.

NEXT : END

DTC P050B COLD START IGNITION TIMING PERFORMANCE

DESCRIPTION

This monitor will run when the engine is started at an engine coolant temperature of -10 to 50°C (14 to 122°F).
The DTC will set after the engine idles for 13 seconds (2 trip detection logic).

The DTC is designed to monitor the ignition timing at cold start. When the engine is started at an engine coolant
temperature of lower than 50°C (122°F), the ECM checks the ignition timing at engine idling. If the ignition
timing advances beyond the specified level within 10 seconds, the ECM interprets this as a malfunction. The
MIL is illuminated and a DTC is set when the malfunction is detected in consecutive driving cycles (2 tip
detection logic).

HINT:

The ISC learning is performed when the engine is warmed up and has been idling for 5 minutes.

coolant temperature recorded in the freeze frame data).

NOTE:

When the negative battery terminal is disconnected during inspections or
repairs, the ISC (Idle Speed Control) learning values are cleared. This DTC
cannot be set with the ISC learning values cleared.

2008 Toyota Tundra

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