Toyota Tundra (2015 year). Manual — part 1143
A
NEXT
NEXT
RESULT
PROCEED TO
DTC is not output
B
B
CHECK FOR INTERMITTENT PROBLEMS
7.
REPLACE AIR FUEL RATIO SENSOR
(a) Replace the air fuel ratio sensor
.
HINT:
Perform "Inspection After Repair" after replacing the air fuel ratio sensor
.
8.
PERFORM CONFIRMATION DRIVING PATTERN
(a) Drive the vehicle according to Confirmation Driving Pattern.
9.
CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P014E, P014F, P015A,
P015B, P015C or P015D)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
(e) Read the DTCs.
Result
RESULT
PROCEED TO
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P014C-P014F...
RESULT
PROCEED TO
DTC is not output
A
DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C or P015D is output
B
B
CHECK ENGINE TO DETERMINE CAUSE OF
EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO
A
END
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P014C-P014F...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000WC30UDX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 1UR-FE 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 consists
stoichiometric levels. The signal from the air fuel ratio 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
NO.
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 leak 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
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172,...
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
PCV hose connections
EGR valve assembly
ECM
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 leak or blockage
MAF meter
ECT sensor
Ignition system
Fuel pressure
Gas leak 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
EGR valve assembly
ECM
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 estimated fuel injection volumes
average fuel trim learning value exceeds the malfunction threshold, the ECM interprets this as a fault in the fuel
system and stores a DTC.
Example:
If the average fuel trim learning value is +35% or more, or -35% or less, the ECM interprets this as a fuel system
malfunction.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172,...
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