Toyota Tundra (2015 year). Manual — part 1305
OK
(a) Remove the AM2 fuse, IG2 MAIN fuse, EFI NO. 1 fuse and IGN
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
AM2 fuse
Always
Below 1 Ω
IG2 MAIN fuse
Always
Below 1 Ω
EFI NO. 1 fuse
Always
Below 1 Ω
IGN fuse
Always
Below 1 Ω
NG
CHECK FOR SHORT IN ALL HARNESSES AND
CONNECTORS CONNECTED TO FUSE AND REPLACE
FUSE
2.
INSPECT INTEGRATION RELAY (IG2, EFI)
(a) Remove the integration relay 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
1C-1 - 1B-8
No battery voltage is applied to
terminals 1B-6 and 1B-7
10 kΩ or higher
1C-1 - 1B-8
Battery voltage is applied to
terminals 1B-6 and 1B-7
Below 1 Ω
1C-1 - 1B-4
No battery voltage is applied to
terminals 1B-2 and 1B-3
10 kΩ or higher
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: ECM Power S...
OK
OK
TESTER
CONNECTION
CONDITION
SPECIFIED
CONDITION
1C-1 - 1B-4
Battery voltage is applied to
terminals 1B-2 and 1B-3
Below 1 Ω
NG
REPLACE INTEGRATION RELAY
3.
CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
(a) Disconnect the ECM connector.
(b) Measure the resistance according to the value(s) in the table
below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
D74-81 (E1) - Body ground
Always
Below 1 Ω
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
4.
INSPECT ECM (IGSW VOLTAGE)
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: ECM Power S...
(a) Disconnect the 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)
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: ECM Power S...
OK
(a) Disconnect the ECM connector.
(b) Disconnect the ignition switch connector.
(c) Disconnect the cable from the battery negative (-) terminal.
(d) Disconnect the cable from the battery positive (+) terminal.
(e) Remove the AM2 fuse and integration relay.
(f) 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
Positive (+) battery cable or 1C-1 -
Body ground
Always
10 kΩ or higher
Positive (+) battery cable or AM2
fuse terminal 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
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: ECM Power S...
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