Toyota Tundra (2015 year). Manual — part 2369
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A
2.
CHECK FOR DTC
(a) Check for DTC
.
Result
RESULT
PROCEED TO
DTC B279A is output
A
DTC B279A and other DTCs are output
B
HINT:
If any DTCs other than B279A are output, troubleshoot those DTCs first.
B
GO TO DIAGNOSTIC TROUBLE CODE CHART
3.
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B279A; ...
OK
(a) Disconnect the J26 ECU connector.
(b) Disconnect the A24 ECM connector.
(c) Measure the resistance and voltage according to the value(s) in the table below.
Standard resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
J26-13 (EFIO) - A24-40 (IMI)
Always
Below 1 Ω
J26-13 (EFIO) or A24-40 (IMI) - Body ground
Always
10 kΩ or higher
Standard voltage:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
J26-13 (EFIO) - Body ground
Always
Below 1 V
A24-40 (IMI) - Body ground
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
4.
CHECK TRANSPONDER KEY ECU (OUTPUT)
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B279A; ...
A
(a) Measure waveform.
Waveform 1 (Reference)
TERMINAL NO.
(SYMBOLS)
TOOL SETTING
SWITCH
CONDITION
J26-13 (EFIO) - J26-16
(GND)
10 V/DIV., 100
msec./DIV.
Ignition switch ON
OK:
Waveform is output normally (see illustration).
Result
RESULT
PROCEED TO
Waveform is not output normally
A
Waveform is output normally (for 1UR-FE)
B
Waveform is output normally (for 3UR-FE)
C
Waveform is output normally (for 3UR-FBE)
D
B
REPLACE ECM
C
REPLACE ECM
D
REPLACE ECM
5.
CHECK TRANSPONDER KEY ECU (POWER SOURCE AND BODY GROUND)
(a) Measure the voltage according to the value(s) in the table
below.
Standard voltage:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
J26-1 (+B) - J26-16 (GND)
Always
11 to 14 V
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B279A; ...
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE TRANSPONDER KEY ECU
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B279A; ...
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