Toyota Tundra (2015 year). Manual — part 1313
OK
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM
4.
INSPECT FUSES (INJ, IG2 MAIN)
(a) Remove the INJ fuse and IG2 MAIN fuse from the engine
room relay block.
(b) Measure the resistance according to the value(s) in the table
below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
INJ fuse
Always
Below 1 Ω
IG2 MAIN fuse
Always
Below 1 Ω
NG
CHECK FOR SHORT IN ALL HARNESSES AND
CONNECTORS CONNECTED TO FUSE AND REPLACE
FUSE
5.
INSPECT INTEGRATION RELAY (IG2)
(a) Inspect the integration relay
.
NG
REPLACE INTEGRATION RELAY
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
(INTEGRATION RELAY - FUEL INJECTOR
ASSEMBLY)
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Fuel Injector C...
Last Modified: 9-16-2014
6.6 J
Doc ID: RM000001FLC08TX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Cranking Holding Function Circuit; 2015 MY Tundra
[08/2014 - ]
Cranking Holding Function Circuit
DESCRIPTION
The cranking holding control system keeps energizing the starter relay from when the ECM detects the starter
starter relay through the park/neutral position switch, and then, the engine is cranked. When the ECM receives a
stable engine speed signal (NE signal), more specifically, when the NE signal reaches a predetermined value, the
ECM stops outputting the STAR signal.
Also, the ECM monitors the starter relay operating conditions based on the STA terminal voltage status.
WIRING DIAGRAM
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Cranking Hold...
INSPECTION PROCEDURE
PROCEDURE
1.
READ VALUE USING TECHSTREAM (STARTER SIGNAL)
(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 / Starter Signal.
(e) Check the result when the ignition switch is turned to the ON and START positions.
OK:
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Cranking Hold...
OK
IGNITION SWITCH CONDITION
STARTER SIGNAL
ON
OFF
START
ON
NG
GO TO STEP 2
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN
IN PROBLEM SYMPTOMS TABLE
2.
INSPECT ECM (STSW TERMINAL VOLTAGE)
(a) Disconnect the ECM connector.
(b) Perform the cranking operation.
(c) Measure the voltage according to the value(s) in the table
below.
Standard Voltage:
TESTER CONNECTION
IGNITION SWITCH
CONDITION
SPECIFIED
CONDITION
A24-14 (STSW) - Body
ground
ON
Below 1 V
START
9 to 13 V
HINT:
DTCs related to the communication with other computers may be
set due to this inspection. Clear those DTCs after the inspection.
NG
GO TO STEP 7
3.
INSPECT ECM (STAR TERMINAL OUTPUT VOLTAGE)
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Cranking Hold...
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