Toyota Tundra (2015 year). Manual — part 1626
OK
OK
(a) Inspect the engine coolant temperature sensor
.
HINT:
If the engine coolant temperature sensor is malfunctioning, after replacing it, check if engine starting trouble
occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to
step 72 and perform fuel system troubleshooting A (steps 95 to 102), fuel system troubleshooting B (steps 103 to
105), intake system troubleshooting (steps 106 to 108), and ignition system troubleshooting (steps 109 to 114), in
that order.
NG
REPLACE ENGINE COOLANT TEMPERATURE SENSOR
59.
CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)
(a) Disconnect the ECT sensor connector.
(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
D28-2 - D74-76 (THW)
Always
Below 1 Ω
D28-1 - D74-98 (ETHA)
Always
Below 1 Ω
D28-2 or D74-76 (THW) - Body ground
Always
10 kΩ or higher
D28-1 or D74-98 (ETHA) - Body ground
Always
10 kΩ or higher
HINT:
REPAIR OR REPLACE HARNESS OR CONNECTOR
60.
CHECK MASS AIR FLOW METER
(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:
The A/C switch and all accessory switches should be off, and the shift lever should be in N or P.
(c) Turn the Techstream on.
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Start...
OK
OK
(d) Enter the following menus: Powertrain / Engine and ECT / Data List / MAF.
(e) Check MAF in the Data List during idling.
Standard:
4.0 to 8.0 gm/sec.
HINT:
If the mass air flow meter is malfunctioning, after replacing it, check if engine starting trouble occurs again. If
engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 72 and
perform fuel system troubleshooting A (steps 95 to 102), fuel system troubleshooting B (steps 103 to 105), intake
system troubleshooting (steps 106 to 108), and ignition system troubleshooting (steps 109 to 114), in that order.
NG
REPLACE MASS AIR FLOW METER
61.
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
(a) Disconnect the MAF meter connector.
(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
D7-3 (VG) - D74-74 (VG)
Always
Below 1 Ω
D7-2 (E2G) - D74-75 (E2G)
Always
Below 1 Ω
D7-3 (VG) or D74-74 (VG) - Body ground
Always
10 kΩ or higher
HINT:
REPAIR OR REPLACE HARNESS OR CONNECTOR
62.
READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Using the Techstream, select and read [Long FT] and [Atmosphere Pressure] in the Data List.
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Start...
A
A
DATA LIST ITEM
RESULT
SUSPECTED AREA
PROCEED TO
Long FT
+25% or more or less than -25%
Air fuel ratio sensor
Heated oxygen sensor
Mass air flow meter
Fuel injector
ECM
A
Atmosphere Pressure
80 kPa or less (when altitude is 0 m)
Both Data List items listed above Values are other than above
-
B
B
GO TO STEP 66
63.
PERFORM SIMULATION TEST
(a) Remove the EFI NO. 1 and ETCS fuses from the engine room relay block.
(b) After 60 seconds or more elapse, install the EFI NO. 1 and ETCS fuses.
(c) Check if the engine can be started.
Result
RESULT
PROCEED TO
Engine can be started
A
Engine cannot be started
B
B
GO TO STEP 66
64.
INSPECT AIR FUEL RATIO SENSOR
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Start...
A
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Data
List / Fuel System Status #1 and Fuel System Status #2.
(e) Confirm that Fuel System Status #1 and Fuel System Status #2
are both CL.
(f) Enter the following menus: Powertrain / Engine and ECT / Data List
/ AF Lambda B1S1 and AF Lambda B2S1.
(g) Confirm that AF Lambda B1S1 and AF Lambda B2S1 are both
Test / Control the Injection Volume for A/F sensor.
(i) Read the output voltage from the air fuel ratio sensor when
increasing and decreasing the fuel injection volume.
Standard:
TESTER
DISPLAY
INJECTION
VOLUME
SPECIFIED CONDITION
AFS Voltage
B1S1
AFS Voltage
B2S1
+12.5%
Air fuel ratio sensor output voltage is
below 3.1 V
-12.5%
Air fuel ratio sensor output voltage is
higher than 3.4 V
Result
RESULT
PROCEED TO
Normal
A
Abnormal
B
HINT:
REPLACE AIR FUEL RATIO SENSOR
65.
PERFORM SIMULATION TEST
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604; Start...
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