Toyota Tundra (2015 year). Manual — part 2051
(a) Disconnect the A24 and D74 ECM connectors.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the
table below.
Standard voltage:
TESTER CONNECTION
SWITCH
CONDITION
SPECIFIED
CONDITION
A24-28 (IGSW) - D74-81
(E1)
Ignition switch ON
11 to 14 V
NG
GO TO STEP 5
OK
REPLACE ECM
5.
CHECK HARNESS AND CONNECTOR (RELAY BLOCK - ECM, IGNITION SWITCH,
BATTERY AND BODY GROUND)
(a) Disconnect the A24 ECM connector.
(b) Disconnect the J9 ignition switch connector.
(c) Disconnect the cable from the battery positive (+) terminal.
(d) Remove the AM2 fuse and integration relay.
(e) Measure the resistance according to the value(s) in the table below.
Standard resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
A24-28 (IGSW) - 1B-8
Always
Below 1 Ω
1B-7 - Body ground
Always
Below 1 Ω
Positive (+) battery cable - 1C-1
Always
Below 1 Ω
Positive (+) battery cable - AM2 fuse terminal 1
Always
Below 1 Ω
J9-5 (AM2) - AM2 fuse terminal 2
Always
Below 1 Ω
J9-6 (IG2) - 1B-6
Always
Below 1 Ω
A24-28 (IGSW) or 1B-8 - Body ground
Always
10 kΩ or higher
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: ECM Power S...
OK
OK
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
Positive (+) battery cable or AM2 fuse terminal 1 - Body ground
Always
10 kΩ or higher
Positive (+) battery cable or 1C-1 - Body ground
Always
10 kΩ or higher
J9-5 (AM2) or AM2 fuse terminal 2 - Body ground
Always
10 kΩ or higher
J9-6 (IG2) or 1B-6 - Body ground
Always
10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
6.
INSPECT IGNITION SWITCH
(a) Inspect the ignition switch
.
NG
REPLACE IGNITION SWITCH
7.
CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM, BATTERY AND
BODY GROUND)
(a) Disconnect the A24 ECM connector.
(b) Disconnect the cable from the battery positive terminal.
(c) Remove the integration relay from the engine room relay block.
(d) Disconnect the integration relay connector.
(e) Measure the resistance according to the value(s) in the table below.
Standard resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
A24-3 (+B) - 1B-4
Always
Below 1 Ω
A24-2 (+B2) - 1B-4
Always
Below 1 Ω
A24-34 (MREL) - 1B-2
Always
Below 1 Ω
1C-1 - Positive (+) battery cable
Always
Below 1 Ω
1B-3 - Body ground
Always
Below 1 Ω
A24-3 (+B) or 1B-4 - Body ground
Always
10 kΩ or higher
A24-2 (+B2) or 1B-4 - Body ground
Always
10 kΩ or higher
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: ECM Power S...
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
A24-34 (MREL) or 1B-2 - Body ground
Always
10 kΩ or higher
1C-1 or Positive (+) battery cable - Body ground
Always
10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPAIR OR REPLACE ENGINE ROOM RELAY
BLOCK
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: ECM Power S...
Last Modified: 9-16-2014
6.6 J
Doc ID: RM000001D6V0U3X
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: VC Output Circuit; 2015 MY Tundra [08/2014 - ]
VC Output Circuit
DESCRIPTION
The ECM constantly generates 5 V power from the battery voltages supplied to the +B (BATT) terminal to
operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit.
When the VC circuit is short-circuited, the microprocessor in the ECM and sensors that are supplied with power
through the VC circuit are inactivated because the power is not supplied from the VC circuit. Under this
condition, the system does not start up and the MIL does not illuminate even if the system malfunctions.
HINT:
Under normal conditions, the MIL is illuminated for several seconds when the ignition switch is first
turned to ON. The MIL goes off when the engine is started.
WIRING DIAGRAM
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: VC Output Cir...
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