Toyota Tundra (2015 year). Manual — part 1579

OK

(a) Check the air induction system for vacuum leakage

.

OK:

No leakage from air induction system.

NG

REPAIR OR REPLACE AIR INDUCTION SYSTEM

4.

CHECK THROTTLE VALVE

(a) Check the throttle valve condition.

OK:

Throttle valve is not contaminated with foreign objects and moves smoothly.

NG

REPLACE THROTTLE BODY ASSEMBLY

OK

REPLACE ECM

3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0505; Idle...

Last Modified: 9-16-2014

6.6 C

Doc ID: RM000002U1303WX

Model Year: 2015

Model: Tundra

Prod Date Range: [08/2014 - ]

Title: 3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P050A; Cold Start Idle Air Control System

Performance; 2015 MY Tundra [08/2014 - ]

DTC

P050A

Cold Start Idle Air Control System Performance

DESCRIPTION

This monitor will run when the engine is started with the engine coolant temperature at -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 idle air control at cold start. When the engine is started with the engine

coolant temperature at lower than 50°C (122°F), the ECM (PCM) measures the accumulated mass air flow at

engine idling. If it does not reach the criteria within 10 seconds, the ECM (PCM) interprets this as a

malfunction. The MIL is illuminated and a DTC is set when the malfunction is detected in consecutive driving

cycles (2 trip detection logic).

The ETCS (Electronic Throttle Control System) controls the idle speed. The ETCS operates the throttle actuator

to open and close the throttle valve, and adjusts the intake air amount to achieve the target idle speed.

NOTICE:

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.

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

DTC CODE

DTC DETECTION CONDITION

TROUBLE AREA

P050A

Insufficient mass air flow at cold start

(2 trip detection logic)

Throttle body

Mass air flow meter

PCV hose

Air cleaner filter element sub-assembly

Air induction system

VVT system

ECM

3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P050A; Cold...

DTC CODE

DTC DETECTION CONDITION

TROUBLE AREA

Wire harness or connector

MONITOR STRATEGY

Related DTCs

P050A: Cold start idle air speed control system

Required sensors/Components (Main)

Throttle body

Required sensors/Components (Related)

Mass air flow meter

Engine coolant temperature sensor

Duration

10 seconds

MIL operation

2 driving cycles

TYPICAL ENABLING CONDITIONS

Monitor runs whenever

following DTCs not present

P0010, P0020 (Camshaft Timing Oil control valve)

P0011, P0021 (VVT System - Advance)

P0012, P0022 (VVT System - Retard)

P0013, P0023 (Exhaust Camshaft Timing Oil control valve)

P0014, P0024 (Exhaust VVT System - Advance)

P0015, P0025 (Exhaust VVT System - Retard)

P0016, P0018 (VVT System - Misalignment)

P0017, P0019 (Exhaust VVT System - Misalignment)

P0102, P0103 (Mass air flow meter)

P0115, P0117, P0118 (Engine coolant temperature sensor)

P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position

sensor)

P0125 (Insufficient coolant temperature for closed loop fuel control)

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)

P0351 - P0358 (Igniter)

P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT sensor)

P0500 (Vehicle speed sensor)

P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D, P2195, P2196,

P2197, P2198, P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253,

P2255, P2256 (Air fuel ratio 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

3 seconds or more

3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P050A; Cold...

Fuel-cut

OFF

Vehicle speed

Less than 3 km/h (1.875 mph)

Time after shift position

changed

2 seconds or more

Atmospheric pressure

76 kPa (570 mmHg) or more

TYPICAL MALFUNCTION THRESHOLDS

Accumulated mass air flow

Less than 116 g (varies with ECT)

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.

1.

Turn the ignition switch to ON and turn the Techstream on.

2.

Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

3.

Turn the ignition switch off and wait for at least 30 seconds.

4.

Turn the ignition switch to ON and turn the Techstream on.

5.

Enter the following menu items: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.

6.

Start the engine and warm it up until the coolant temperature is the same as the coolant

temperature in the freeze frame data.

8.

Idle the engine for 1 minute or more [A].

9.

Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].

10.

Read the Pending DTCs.

HINT:

If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.

11.

Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

12.

Input the DTC: P050A.

13.

Check the DTC judgment result.

TESTER

DISPLAY

DESCRIPTION

NORMAL

DTC judgment completed

System normal

ABNORMAL

DTC judgment completed

System abnormal

INCOMPLETE

DTC judgment not completed

Perform driving pattern after confirming DTC enabling conditions

N/A

Unable to perform DTC judgment

HINT:

If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, idle the engine for 3 minutes, let the

engine cool down, and then perform steps [A] through [B].

14.

3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P050A; Cold...