Toyota Tundra (2015 year). Manual — part 1533
RESULT
PROCEED TO
DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C or P015D is output
B
B
CHECK EXTREMELY RICH OR LEAN ACTUAL AIR
FUEL RATIO
A
END
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P014C-P014...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000WC30UBX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172,P0174,P0175; System Too Lean (Bank
1); 2015 MY Tundra [08/2014 - ]
DTC
P0171
System Too Lean (Bank 1)
DTC
P0172
System Too Rich (Bank 1)
DTC
P0174
System Too Lean (Bank 2)
DTC
P0175
System Too Rich (Bank 2)
DESCRIPTION
The fuel trim is related to the feedback compensation value, not to the basic injection time. The fuel trim
stoichiometric levels. The signal from the Air-Fuel Ratio (A/F) sensor indicates whether the air-fuel ratio is rich
or lean compared to the stoichiometric ratio. This triggers a reduction in the fuel injection volume if the
air-fuel ratio is rich and an increase in the fuel injection volume if it is lean.
Factors such as individual engine differences, wear over time and changes in operating environment cause
short-term fuel trim to vary from the central value. The long-term fuel trim, which controls overall fuel
compensation, compensates for long-term deviations in the fuel trim from the central value caused by the
short-term fuel trim compensation.
DTC
CODE
DTC DETECTION CONDITION
TROUBLE AREA
P0171
P0174
With warm engine and stable air-fuel ratio feedback,
fuel trim considerably in error to lean side
(2 trip detection logic)
Air induction system
Injector blockage
Mass Air Flow (MAF) meter
Engine Coolant Temperature
(ECT) sensor
Fuel pressure
Gas leakage from exhaust
system
Open or short in A/F sensor (for
Sensor 1) circuit
A/F sensor (for Sensor 1)
A/F sensor heater (for Sensor
1)
Integration relay
A/F sensor heater and
integration relay circuits
PCV valve and hose
PCV hose connections
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P017...
DTC
CODE
DTC DETECTION CONDITION
TROUBLE AREA
ECM
Fuel pressure switching valve
Fuel pressure regulator
Fuel pressure regulator for high
pressure
Fuel pump
Fuel pump ECU
Fuel sender gauge assembly
Wire harness or connector
P0172
P0175
With warm engine and stable air-fuel ratio feedback,
fuel trim considerably in error to rich side
(2 trip detection logic)
Injector leakage or blockage
MAF meter
ECT sensor
Ignition system
Fuel pressure
Gas leakage from exhaust
system
Open or short in A/F sensor (for
Sensor 1) circuit
A/F sensor (for Sensor 1)
A/F sensor heater (for Sensor
1)
Integration relay
A/F sensor heater and
integration relay circuits
ECM
Fuel pressure switching valve
Fuel pressure regulator
Fuel pressure regulator for high
pressure
Fuel pump
Fuel pump ECU
Fuel sender gauge assembly
Wire harness or connector
HINT:
Under closed-loop fuel control, fuel injection volumes that deviate from those estimated by the ECM cause
changes in the long-term fuel trim compensation value. The long-term fuel trim is adjusted when there are
persistent deviations in the short-term fuel trim values. Deviations from the ECM's estimated fuel injection
air-fuel ratio). If the average fuel trim learning value exceeds the malfunction threshold, the ECM interprets
this as a fault in the fuel system and sets a DTC.
Example:
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P017...
The average fuel trim learning value is +35% or more or -35% or less, the ECM interprets this as a fuel
system malfunction.
MONITOR STRATEGY
Related DTCs
P0171: Fuel trim lean (for Bank 1)
P0172: Fuel trim rich (for Bank 1)
P0174: Fuel trim lean (for Bank 2)
P0175: Fuel trim rich (for Bank 2)
Required Sensors/Components (Main)
Fuel system
Required Sensors/Components (Related)
A/F sensor, Mass air flow meter, Crankshaft position sensor
Duration
Within 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)
P0031, P0032, P0051, P0052, P101D, P103D (Air fuel ratio sensor
heater)
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P017...
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