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B58697
B58699
B58772
Wire Harness Side
T7
Transponder Key ECU Assy
+B
RXCK
T6
Transponder Key Amplifier
CODE
GND
CODE
TXCT
TXCT
VC12
RXCK
AGND
--
DIAGNOSTICS
ENGINE IMMOBILIZER SYSTEM (1ND--TV)
05--407
COROLLA Supplement (RM1129E)
2
CHECK WHETHER ENGINE STARTS WITH OTHER KEYS
(a)
Insert the vehicle’s other key into the ignition key cylinder.
(b)
Check that the engine starts with the key.
OK: Engine starts.
NG
Go to step 3
OK
REREGISTER OR REPLACE KEY THAT CANNOT START ENGINE
3
CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSY -- TRANSPONDER
KEY AMPLIFIER)
(a)
Disconnect the T7 ECU connector.
(b)
Disconnect the T6 amplifier connector.
(c)
Measure the resistance of the wire harness side connec-
tors.
Standard:
Tester Connection
Specified Condition
T7--6 (VC12) -- T6--5 (+B)
Below 1
Ω
T7--4 (CODE) -- T6--2 (CODE)
Below 1
Ω
T7--13 (TXCT) -- T6--1 (TXCT)
Below 1
Ω
T7--12 (AGND) -- T6--3 (GND)
Below 1
Ω
T7--5 (RXCK) -- T6--4 (RXCK)
Below 1
Ω
T7--6 (VC12) or T6--5 (+B) --
Body ground
10 k
Ω
or higher
T7--4 (CODE) or T6--2 (CODE) --
Body ground
10 k
Ω
or higher
T7--13 (TXCT) or T6--1 (TXCT) --
Body ground
10 k
Ω
or higher
T7--12 (AGND) or T6--3 (GND) --
Body ground
10 k
Ω
or higher
T7--5 (RXCK) or T6--4 (RXCK) --
Body ground
10 k
Ω
or higher
NG
REPAIR
OR
REPLACE
HARNESS
AND
CONNECTOR
OK
4
CHECK OPERATION OF TRANSPONDER KEY AMPLIFIER
(a)
After replacing the transponder key amplifier with a normally functioning transponder key amplifier,
check that the engine starts.
OK: Engine starts.
NG
REPLACE TRANSPONDER KEY ECU ASSY
OK
END
(TRANSPONDER KEY AMPLIFIER DEFECTIVE)
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TOYOTA COROLLA REPAIR MANUAL SUPP 1129E