Toyota Tundra. Manual — part 1582

OK: Go to Next Step

4. CHECK PCV SYSTEM

a. Allow the engine to idle.

b. Pinch the positive crankcase ventilation (PCV) hose.

c. Check the engine speed.

OK:

The engine speed rises when the PCV hose is pinched.

NG: Go to step 9

OK: Go to Next Step

5. CHECK AIR CLEANER FILTER

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

NG: Go to step 10

OK: Go to Next Step

6. CHECK AIR INDUCTION SYSTEM

a. Check the air induction system for vacuum leakage (see ON-VEHICLE INSPECTION ).

NG: Go to step 11

OK: Go to step 12

7. REPAIR OR REPLACE THROTTLE BODY

a. Repair or replace the throttle body (see REMOVAL ).

NEXT: Go to step 13

8. CHECK AND REPAIR VVT SYSTEM

NEXT: Go to step 13

9. REPAIR OR REPLACE PCV HOSE

NEXT: Go to step 13

10. REPLACE AIR CLEANER FILTER

NEXT: Go to step 13

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

11. REPAIR OR REPLACE AIR INDUCTION SYSTEM

NEXT: Go to step 13

12. REPLACE MASS AIR FLOW METER

a. Replace the mass air flow meter (see REMOVAL ).

13. CHECK DTCS

a. Check that the engine coolant temperature is -10 to 50°C (14 to 122°F).

b. Clear the DTC (see DTC CHECK/CLEAR ).

c. Enter the check mode using the Techstream (see CHECK MODE PROCEDURE ).

d. Allow the engine to idle for 1 minute.

e. Read the DTCs.

OK:

No DTC is output.

NG: REPLACE ECM (See REMOVAL )

OK: 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 be 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 stored when the malfunction is detected in consecutive driving cycles (2 trip
detection logic).

HINT:

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

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 stored with the ISC learning values cleared.

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Fig. 195: PO50B Detection Logic
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

DTC

DTC Detection Condition

Trouble Area

P050B

Insufficient ignition timing retard
at cold start (2-trip detection logic)



Throttle body assembly



Mass air flow meter



PCV system



Air cleaner filter element



Air induction system



VVT system



ECM

Related DTCs

P050B: Cold start ignition timing performance

Required Sensors/Components (Main)

Throttle body assembly

Required Sensors/Components (Related) Mass air flow meter Engine Coolant Temperature (ECT) sensor
Frequency of Operation

Once per driving cycle

Duration

10 seconds

MIL Operation

2 driving cycles

Sequence of Operation

None

P0010, P0020 (VVT Oil Control Valve)
P0011, P0021 (VVT System - Advance)
P0012, P0022 (VVT System - Retard)
P0016, P0018 (VVT System - Misalignment)
P0013, P0023 (Exhaust VVT Oil Control Valve)
P0014, P0024 (Exhaust VVT System - Advance)
P0015, P0025 (Exhaust VVT System - Retard)

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS

INSPECTION PROCEDURE

HINT:



DTC P050B may be set when the engine has the symptoms listed below. If necessary, check the trouble
areas listed below.

SYMPTOMS LIST

Monitor runs whenever
following DTCs not present

P0017, P0019 (Exhaust VVT System - Misalignment)
P2195, P2196, P2197, P2198, P2237, P2238, P2239, P2240, P2241,
P2242, P2252, P2253, P2255, P2256, P2A00, P2A03 (Air Fuel Ratio
Sensor)
P0102, P0103 (Mass Air Flow Sensor)
P0115, P0117, P0118 (Engine Coolant Temperature Sensor)
P0125 (Insufficient Coolant Temperature for Closed Loop Fuel Control)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle
Position Sensor)
P0171, P0172, P0174, P0175 (Fuel System)
P0301 - P0308 (Misfire)
P0335 (Crankshaft Position Sensor) P1340 (Camshaft Position Sensor)
P0340, P0342, P0343, P0345, P0347, P0348 (VVT Sensor)
P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT Sensor)
P0351 - P0358 (Igniter)
P0500 (Vehicle Speed Sensor)
P0705 (Shift Lever Position Switch)

Battery voltage

8 V or more

Time after engine start

3 seconds or more

Starter

OFF

ECT at engine start

-10°C (14°F) or more

ECT

-10 to 50°C (14 to 122°F)

Engine idling time

3 seconds or more

Fuel-cut

OFF

Vehicle speed

Less than 3 km/h (1.875 mph)

Atmospheric pressure

76 kPa (570 mmHg) or more

Accumulated time when ignition timing retard value is cut off

5 seconds or more

Symptoms

Factor

Trouble Area

Low idle speed when engine is cold (immediately after
engine start)

Excessive engine
friction



Engine oil
deterioration



Drive belt tension



A/C compressor

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra