Toyota Tundra (2015 year). Manual — part 2360
Last Modified: 9-16-2014
6.6 U
Doc ID: RM000002X2W02PX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: TERMINALS OF ECU; 2015 MY Tundra [08/2014 -
]
TERMINALS OF ECU
1. CHECK TRANSPONDER KEY AMPLIFIER
(a) Disconnect the J20 amplifier connector.
(b) Measure the resistance according to the value(s) in the table below.
TERMINAL NO. (SYMBOLS)
WIRING COLOR
TERMINAL DESCRIPTION CONDITION SPECIFIED CONDITION
J20-7 (AGND) - Body ground GR - Body ground
Ground
Always
Below 1 Ω
If the result is not as specified, there may be a malfunction on the wire harness side.
(c) Reconnect the J20 amplifier connector.
(d) Measure the resistance and voltage according to the value(s) in the table below.
TERMINAL NO.
(SYMBOLS)
WIRING
COLOR
TERMINAL DESCRIPTION
CONDITION
SPECIFIED CONDITION
J20-1 (VC5) - J20-7
(AGND)
G - GR
Power supply
No key in ignition key
cylinder
Below 1 V
Key inserted in ignition
key cylinder
4.6 to 5.4 V
J20-4 (CODE) -
J20-7 (AGND)
LG - GR
Demodulated signal of
key code data
No key in ignition key
cylinder
Below 1 V
Key inserted in ignition
key cylinder
Pulse generation (see
waveform 1)
J20-5 (TXCT) -
J20-7 (AGND)
L - GR
Key code output signal
No key in ignition key
cylinder
Below 1 V
Key inserted in ignition
key cylinder
Pulse generation (see
waveform 2)
J20-7 (AGND) -
Body ground
GR - Body
ground
Ground
Always
Below 1 Ω
If the result is not as specified, the amplifier may have a malfunction.
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: TERMI...
(e) Using an oscilloscope, check waveform 1.
Waveform 1 (Reference):
TERMINAL NO.
(SYMBOLS)
TOOL SETTING
CONDITION
J20-4 (CODE) - J20-7
(AGND)
5 V/DIV., 20
msec./DIV.
Key inserted in ignition
key cylinder
(f) Using an oscilloscope, check waveform 2.
Waveform 2 (Reference):
TERMINAL NO.
(SYMBOLS)
TOOL SETTING
CONDITION
J20-5 (TXCT) - J20-7
(AGND)
5 V/DIV., 20
msec./DIV.
Key inserted in ignition
key cylinder
2. CHECK TRANSPONDER KEY ECU
(a) Disconnect the J26 ECU connector.
(b) Measure the resistance and voltage according to the value(s) in the table below.
TERMINAL NO.
(SYMBOLS)
WIRING
COLOR
TERMINAL
DESCRIPTION
CONDITION
SPECIFIED
CONDITION
J26-16 (GND) - Body
ground
W-B - Body
ground
Ground
Always
Below 1 Ω
J26-1 (+B) - J26-16
(GND)
G - W-B
Battery
Always
11 to 14 V
J26-2 (IG) - J26-16
(GND)
GR - W-B
Ignition switch
Ignition switch off
Below 1 V
Ignition switch ON
11 to 14 V
J26-3 (KSW) - J26-16
(GND)
LG - W-B
Unlock warning
switch
No key in ignition key
cylinder
10 kΩ or higher
Key inserted in ignition key
cylinder
Below 1 Ω
If the result is not as specified, there may be a malfunction on the wire harness side.
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: TERMI...
(c) Reconnect the J26 ECU connector.
(d) Measure the resistance and voltage according to the value(s) in the table below.
TERMINAL NO.
(SYMBOLS)
WIRING
COLOR
TERMINAL
DESCRIPTION
CONDITION
SPECIFIED
CONDITION
J26-14 (VC5) -
J26-16 (GND)
G - W-B
Power source
No key in ignition key cylinder
Below 1 V
Key inserted in ignition key cylinder
4.6 to 5.4 V
J26-7 (CTY) -
J26-16 (GND)
Y - W-B
Door courtesy
Door closed
10 kΩ or higher
Door open
Below 1 Ω
J26-4 (TXCT) -
J26-16 (GND)
L - W-B
Transponder key
amplifier
communication
signal
No key in ignition key cylinder
Below 1 V
Key inserted in ignition key cylinder
Pulse generation
(see waveform 1)
J26-15 (CODE)
- J26-16
(GND)
LG - W-B
Transponder key
amplifier
communication
signal
No key in ignition key cylinder
Below 1 V
Key inserted in ignition key cylinder
Pulse generation
(see waveform 2)
J26-13 (EFIO)
- J26-16
(GND)
Y - W-B
ECM output signal
Ignition switch off
Below 1 V
Ignition switch ON
Pulse generation
(see waveform 3)
J26-12 (EFII) -
J26-16 (GND)
SB - W-B
ECM input signal
Within 3 seconds after starter operates
and initial combustion occurs, or within 3
seconds after ignition switch first turned to
ON after battery disconnected and
reconnected
Pulse generation
(see waveform 4)
J26-8 (IND) -
J26-16 (GND)
V - W-B
Security indicator
light signal
Immobiliser set status
Alternating
between 11 to 14
V and below 1 V
Immobiliser unset status
Below 1 V
J26-9 (D) -
J26-16 (GND)
BE - W-B
Diagnosis tester
communication
Always
Pulse generation
If the result is not as specified, the ECU may have a malfunction.
(e) Using an oscilloscope, check waveform 1.
Waveform 1 (Reference):
TERMINAL NO.
(SYMBOLS)
TOOL SETTING
CONDITION
J26-4 (TXCT) - J26-16
(GND)
5 V/DIV., 20
msec./DIV.
Key inserted in ignition
key cylinder
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: TERMI...
(f) Using an oscilloscope, check waveform 2.
Waveform 2 (Reference):
TERMINAL NO.
(SYMBOLS)
TOOL SETTING
CONDITION
J26-15 (CODE) -
J26-16 (GND)
5 V/DIV., 20
msec./DIV.
Key inserted in ignition
key cylinder
(g) Using an oscilloscope, check waveform 3.
Waveform 3 (Reference):
TERMINAL NO.
(SYMBOLS)
TOOL SETTING
CONDITION
J26-13 (EFIO) - J26-16
(GND)
10 V/DIV., 100
msec./DIV.
Ignition switch
ON
(h) Using an oscilloscope, check waveform 4.
Waveform 4 (Reference):
TERMINAL
NO.
(SYMBOLS)
TOOL
SETTING
CONDITION
J26-12 (EFII)
- J26-16
(GND)
5 V/DIV., 500
msec./DIV.
Within 3 seconds after starter operates
and initial combustion occurs, or within
3 seconds after ignition switch first
turned to ON after battery
disconnected and reconnected
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: TERMI...
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