Toyota Tundra (2015 year). Manual — part 2366
OK
NEXT
(a) Disconnect the J26 ECU connector.
(b) Disconnect the J20 amplifier connector.
(c) Measure the resistance according to the value(s) in the table
below.
Standard resistance:
TESTER CONNECTION
CONDITION
SPECIFIED
CONDITION
J26-14 (VC5) - J20-1 (VC5)
Always
Below 1 Ω
J26-15 (CODE) - J20-4 (CODE)
J26-4 (TXCT) - J20-5 (TXCT)
J26-5 (AGND) - J20-7 (AGND)
J26-14 (VC5) or J20-1 (VC5) - Body
ground
Always
10 kΩ or higher
J26-15 (CODE) or J20-4 (CODE) -
Body ground
J26-4 (TXCT) or J20-5 (TXCT) -
Body ground
J26-5 (AGND) or J20-7 (AGND) -
Body ground
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
6.
REPLACE TRANSPONDER KEY AMPLIFIER
(a) Temporarily replace the transponder key amplifier with a new or normally functioning one
.
7.
CHECK WHETHER ENGINE STARTS
(a) Check that the engine starts normally.
OK:
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2796,B...
Engine starts normally.
NG
REPLACE TRANSPONDER KEY ECU
OK
END (TRANSPONDER KEY AMPLIFIER IS
DEFECTIVE)
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2796,B...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000001TCH027X
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2797; Communication Malfunction No. 1; 2015
MY Tundra [08/2014 - ]
DTC
B2797
Communication Malfunction No. 1
DESCRIPTION
This DTC is output when a communication error occurs between the transponder key amplifier and transponder
key ECU. Some possible reasons for the communication error are: 1) 2 or more ignition keys are positioned too
close together, or 2) noise is occurring in the communication line.
DTC
CODE
DTC DETECTION CONDITION
TROUBLE AREA
B2797
Keys are positioned too close to each other, or noise occurred in
communication line
Key
Harness or connector
Transponder key
amplifier
Transponder key ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
When the transponder key ECU is replaced, reregister the ECU - ECM communication ID
.
PROCEDURE
1.
CHECK KEY
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2797; ...
A
(a) Check whether the ignition key being used is near other
ignition keys as shown in the illustration. Also, check whether
the key ring is in contact with the key grip.
Result
RESULT
PROCEED
TO
Key is near other keys and/or key ring is in contact with
key grip
A
Key is not near other keys and/or key ring is not in
contact with key grip
B
B
GO TO STEP 3
2.
CHECK FOR DTC
(a) Separate the keys from each other, or remove the key ring.
(b) Clear the DTC
.
(c) Insert a key into the ignition key cylinder. Remove it. Repeat for all other keys.
(d) Check that no DTC is output
.
OK:
DTC B2797 is not output.
NG
GO TO STEP 3
OK
END
3.
CHECK TRANSPONDER KEY ECU (NOISE)
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2797; ...
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