Toyota Tundra (2015 year). Manual — part 1145
A
OK
(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
3.
CHECK INTAKE 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 intake system for vacuum leaks
.
OK:
No leaks in intake system.
HINT:
Perform "Inspection After Repair" after repairing or replacing the intake system
.
NG
REPAIR OR REPLACE INTAKE SYSTEM
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172,...
OK
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 for A/F Sensor operation with the engine idling.
HINT:
INJECTION VOLUME
STATUS
VOLTAGE
AFS Voltage B1S1 or AFS Voltage B2S1
(Air fuel ratio)
+12.5%
Rich
Below 3.1 V
AFS Voltage B1S1 or AFS Voltage B2S1
(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
O2S B1S2 or O2S B2S2
(Heated oxygen)
-12.5%
Lean
Below 0.4 V
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
A
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172,...
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
connections
Fuel injector
blockage
Gas leaks from
exhaust system
Intake system
Fuel pressure
Mass air flow
meter assembly
Manifold absolute
pressure sensor
Engine coolant
temperature
sensor
EGR valve
assembly
Rich
Rich
Actual air fuel ratio rich
Fuel injector
leakage or
blockage
Gas leaks from
exhaust system
Ignition system
Fuel pressure
Mass air flow
meter assembly
Manifold absolute
pressure sensor
Engine coolant
temperature
sensor
A
Lean
Lean/Rich
Air fuel ratio sensor
malfunction
Air fuel ratio
sensor
EGR valve
assembly
B
Rich
Lean/Rich
Air fuel ratio sensor
malfunction
Air fuel ratio sensor
B
Lean: During the Control the Injection Volume for A/F Sensor Active Test, 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.
Rich: During the Control the Injection Volume for A/F Sensor Active Test, the AFS Voltage is consistently below
3.1 V, and the O2S is consistently higher than 0.55 V.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172,...
A
OK
B
GO TO STEP 11
5.
READ VALUE USING TECHSTREAM (COOLANT TEMP)
(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 / Data List / Coolant Temp.
(e) Read Coolant Temp twice, when the engine is both cold and warmed up.
Standard:
With cold engine: Same as ambient air temperature.
With warm engine: Between 75°C and 100°C (167°F and 212°F).
HINT:
Perform "Inspection After Repair" after replacing the engine coolant temperature sensor
.
NG
REPLACE ENGINE COOLANT TEMPERATURE
SENSOR
6.
READ VALUE USING TECHSTREAM (MAF)
(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 / Data List / MAF and Coolant Temp.
(e) Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
(f) Read MAF with the engine speed at 3000 rpm.
Standard:
Between 18.3 gm/sec. and 25.8 gm/sec. (shift lever: N; A/C: Off).
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172,...
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст