Toyota Tundra (2015 year). Manual — part 1670
(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
(Air fuel ratio)
+12.5%
Rich
Below 3.1 V
-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
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: Fuel Injectio...
A
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
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 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.
B
GO TO STEP 10
4.
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 / All Data / Coolant Temp.
(e) Read the 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).
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: Fuel Injectio...
OK
OK
OK
NG
REPLACE ENGINE COOLANT TEMPERATURE
SENSOR
5.
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 / All Data / MAF and
Coolant Temp.
(e) Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or more.
(f) Read MAF with the engine speed at 3000 rpm.
Standard:
Between 18.0 gm/sec and 27.0 gm/sec (shift lever: N; A/C: Off).
NG
GO TO STEP 15
6.
CHECK FUEL PRESSURE
(a) Check the fuel pressure
.
NG
REPAIR OR REPLACE FUEL SYSTEM
7.
CHECK FOR EXHAUST GAS LEAK
(a) Check for exhaust gas leak.
OK:
No gas leakage.
NG
REPAIR OR REPLACE EXHAUST SYSTEM
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: Fuel Injectio...
OK
NEXT
OK
OK
8.
CHECK FOR SPARK (SPARK TEST)
(a) Perform a spark test
.
HINT:
CHECK FUEL INJECTOR (INJECTION AND VOLUME)
(a) Check the injection and volume.
HINT:
Refer to the fuel injector assembly inspection procedure
.
If the fuel injector assemblies malfunction, engine misfire may occur. The misfire count can be read
using the Techstream. Enter the following menus: Powertrain / Engine and ECT / Data List / Gas Misfire
/ Cylinder #1 Misfire Count (to Cylinder #8 Misfire Count).
NG
REPLACE FUEL INJECTOR
10.
INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)
NG
REPLACE AIR FUEL RATIO SENSOR
11.
CHECK TERMINAL VOLTAGE (+B OF AIR FUEL RATIO SENSOR)
NG
GO TO STEP 20
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: Fuel Injectio...
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