Toyota Tundra (2015 year). Manual — part 1911
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.
Start the engine and warm it up (until the engine coolant temperature is 75°C (167°F) or more)
with all the accessories switched OFF [B].
6.
With the engine warmed up, idle the engine for 2 minutes or more [C].
7.
Drive the vehicle at between 60 km/h and 120 km/h (38 mph and 75 mph) and at an engine speed
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
9.
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.
10.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11.
Input the DTC: P0171, P0172, P0174 or P0175.
12.
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
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [C] through [E] again.
13.
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.
14.
WIRING DIAGRAM
Refer to DTC P2195
.
INSPECTION PROCEDURE
HINT:
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172...
A
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.
A low A/F sensor voltage could be caused by a rich air-fuel mixture. Check for conditions that would
cause the engine to run rich.
A high A/F sensor voltage could be caused by a lean air-fuel mixture. Check for conditions that would
cause the engine to run lean.
Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transmission.
Bank 2 refers to the bank that does not include the No. 1 cylinder.
Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.
PROCEDURE
1.
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0171, P0172, P0174
OR P0175)
(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.
(e) Read DTCs.
Result
RESULT
PROCEED TO
P0171, P0172, P0174 or P0175 is output
A
P0171, P0172, P0174 or P0175 and other DTCs are output
B
HINT:
If any DTCs other than P0171, P0172, P0174 or P0175 are output, troubleshoot those DTCs first.
B
GO TO DTC CHART
2.
CHECK PCV HOSE CONNECTIONS
(a) Check the PCV hose connections
.
OK:
PCV hose is connected correctly and is not damaged.
NG
REPAIR OR REPLACE PCV HOSE
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172...
OK
OK
3.
CHECK AIR INDUCTION SYSTEM
HINT:
If a malfunction occurs when depressing the brake pedal, inspect the brake booster assembly, as there
may be a vacuum leak in the brake booster assembly itself.
(a) Check the air induction system for vacuum leakage
.
OK:
No leakage from air induction system.
HINT:
Perform "Inspection After Repair" after repairing or replacing the air induction system
.
NG
REPAIR OR REPLACE AIR INDUCTION SYSTEM
4.
PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME
FOR A/F SENSOR)
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(e) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection
Volume for A/F Sensor.
(f) Perform the Control the Injection Volume operation with the engine idling.
HINT:
INJECTION VOLUME
STATUS
VOLTAGE
AFS Voltage B1S1 or AFS Voltage B2S1
+12.5%
Rich
Below 3.1 V
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172...
TECHSTREAM DISPLAY (SENSOR)
INJECTION VOLUME
STATUS
VOLTAGE
(Air fuel ratio)
-12.5%
Lean
Higher than 3.4 V
O2S B1S2 or O2S B2S2
(Heated oxygen)
+12.5%
Rich
Higher than 0.55 V
-12.5%
Lean
Below 0.4 V
Result
STATUS OF AFS
VOLTAGE B1S1 OR
AFS VOLTAGE B2S1
STATUS OF O2S
B1S2 OR O2S
B2S2
AIR FUEL RATIO
CONDITION AND AIR FUEL
RATIO SENSOR
CONDITION
SUSPECTED TROUBLE AREA
PROCEED
TO
Lean/Rich
Lean/Rich
Normal
-
A
Lean
Lean
Actual air fuel ratio lean
PCV valve and
hose
PCV hose
connections
Fuel injector
blockage
Gas leaks from
exhaust system
Air induction
system
Fuel pressure
Mass air flow
meter
Engine coolant
temperature
sensor
A
Rich
Rich
Actual air fuel ratio rich
Fuel injector leaks
or blockage
Gas leaks from
exhaust system
Ignition system
Fuel pressure
Mass air flow
meter
Engine coolant
temperature
sensor
A
Lean
Lean/Rich
Air fuel ratio sensor
malfunction
Air fuel ratio
sensor
B
Rich
Lean/Rich
Air fuel ratio sensor
malfunction
Air fuel ratio
sensor
B
Lean: During the Control the Injection Volume, the air fuel ratio sensor output voltage (AFS Voltage) is
consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently below 0.4
V.
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172...
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