Toyota Tundra (2015 year). Manual — part 1192
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000002U1303YX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 1UR-FE 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 stored 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 measures the accumulated mass air flow at engine
idling. If it does not reach the criteria 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).
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 cable is disconnected from the negative battery terminal during inspections or repairs, the ISC
(Idle Speed Control) learning values are cleared. This DTC cannot be stored 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 NO.
DTC DETECTION CONDITION
TROUBLE AREA
P050A
Insufficient mass air flow at cold start
(2 trip detection logic)
Throttle with motor body assembly
Mass air flow meter
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P050A; Cold S...
DTC NO.
DTC DETECTION CONDITION
TROUBLE AREA
PCV hose
Air cleaner filter element sub-assembly
Intake system
VVT system
EGR valve assembly
ECM
Wire harness or connector
MONITOR STRATEGY
Related DTCs
P050A: Cold start idle air speed control system
Required sensors/Components (Main)
Throttle with motor body assembly
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 (VVT oil control valve)
P0011, P0021 (VVT system - Advance)
P0012, P0022 (VVT system - Retard)
P0013, P0023 (Exhaust VVT 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)
P006A, P0107, P0108 (Manifold absolute pressure)
P0101, 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)
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)
P0171, P0172, P0174, P0175 (Fuel system)
P0301 - P0308 (Misfire)
P0335 (Crankshaft position sensor)
P0340, P0342, P0343, P0345, P0347, P0348 (VVT sensor)
P0340, P1340 (Camshaft position sensor)
P0351 - P0358 (Igniter)
P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT sensor)
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P050A; Cold S...
P0401 (EGR system)
P0500 (Vehicle speed sensor)
P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2, P21A3
(Air-fuel ratio imbalance)
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
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 106 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 [A].
5.
Enter the following menus: Powertrain / Engine and ECT / Data List / 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.
9.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
10.
Read the pending DTC.
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
14.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P050A; Cold S...
A
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] again.
15.
If no pending DTC is output, perform a universal trip and check for permanent DTCs
.
HINT:
If a permanent DTC is output, the system is malfunctioning.
If no permanent DTC is output, the system is normal.
16.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other
data from the time the malfunction occurred.
PROCEDURE
1.
CHECK ANY OTHER DTCS OUTPUT
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following the menus: Powertrain / Engine and ECT / Trouble Codes.
(e) Read the pending DTCs.
Result
RESULT
PROCEED TO
DTC P050A is output
A
DTC P050A and other DTCs are output
B
HINT:
If any DTCs other than P050A are output, troubleshoot those DTCs first.
B
GO TO DTC CHART
2.
READ VALUE USING TECHSTREAM (FUEL TRIM)
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P050A; Cold S...
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