Toyota Tundra (2015 year). Manual — part 1138
OK
(a) Disconnect the HO2 sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
2 (+B) - 3 (OX1B)
Always
10 kΩ or higher
2 (+B) - 3 (OX2B)
Always
10 kΩ or higher
2 (+B) - 4 (E1)
Always
10 kΩ or higher
HINT:
Perform "Inspection After Repair" after replacing the heated oxygen sensor
.
NG
REPLACE HEATED OXYGEN SENSOR
3.
CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)
(a) Turn the ignition switch off and wait for 5 minutes.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
D74-45 (HT1B) - D74-114 (OX1B)
Always
10 kΩ or higher
D74-44 (HT2B) - D74-112 (OX2B)
Always
10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM
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.
(d) Warm up the engine.
(e) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor /
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139,...
OK
Data List / O2S B1S2 or O2S B2S2.
HINT:
Fluctuates between 0.4 V or less and 0.55 V or more.
NG
GO TO STEP 8
5.
PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME FOR A/F SENSOR)
(a) Connect the Techstream to the DLC3.
(b) Turn the Techstream on.
(c) Start the engine.
(d) Warm up the engine.
(e) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
HINT:
TECHSTREAM DISPLAY (SENSOR)
VOLTAGE VARIATION
PROCEED TO
AFS Voltage B1S1
AFS Voltage B2S1
Alternates between more and less than 3.3 V
OK
Remains at more than 3.3 V
NG
Remains at less than 3.3 V
NG
HINT:
A normal HO2 sensor voltage (O2S B1S2 or O2S B2S2) reacts in accordance with increases and decreases in fuel
injection volumes. When the A/F sensor voltage remains at either less or more than 3.3 V despite the HO2 sensor
indicating a normal reaction, the A/F sensor is malfunctioning.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139,...
OK
NG
GO TO STEP 16
6.
PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)
(a) Connect the Techstream to the DLC3.
(b) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
HINT:
When performing the Active Test, make sure the shift lever is in P or N.
The A/C switch and all accessory switches should be off.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.
(e) Confirm the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while
performing the Active Test.
HINT:
Do not leave the EGR valve open for 10 seconds or more during the Active Test.
Be sure to return the EGR valve to step 0 when the Active Test is completed.
OK:
MAP and idling condition change in response to EGR step position as follows.
Standard:
-
EGR STEP POSITION (ACTIVE TEST)
0 STEPS
0 TO 30 STEPS
Idling
condition
Steady idling
Idling changes from steady to rough idling or engine stall
MAP
(Data List)
20 to 40 kPa (150 to 300
mmHg)
MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully
closed
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139,...
OK
OK
NG
GO TO STEP 7
OK
CHECK EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO AND
REPAIR CAUSE (FUEL INJECTOR ASSEMBLY, FUEL PRESSURE, GAS
LEAK FROM SYSTEM)
7.
INSPECT EGR VALVE ASSEMBLY
(a) Remove the EGR valve assembly
.
(b) Check if the EGR valve is stuck open.
OK:
EGR valve is tightly closed.
HINT:
Perform "Inspection After Repairs" after replacing the EGR valve assembly
.
NG
REPLACE EGR VALVE ASSEMBLY
OK
CHECK EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO AND
REPAIR CAUSE (FUEL INJECTOR ASSEMBLY, FUEL PRESSURE, GAS
LEAK FROM SYSTEM)
8.
CHECK FOR EXHAUST GAS LEAK
(a) Check for exhaust gas leak.
OK:
No gas leak.
HINT:
Perform "Inspection After Repair" after repairing or replacing the exhaust system
.
NG
REPAIR OR REPLACE EXHAUST GAS LEAK POINT
9.
INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)
NG
REPLACE HEATED OXYGEN SENSOR
10.
CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139,...
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