Lexus SC300 / Lexus SC400. Manual — part 76

DIAGNOSTIC TROUBLE CODE CHART

AT0LR–04

If a malfunction code is displayed during the diagnostic trouble code check, check the circuit listed for that
code in the table below and proceed to the page given.

AT–60

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A304E (1UZ–FE) AUTOMATIC TRANSMISSION

TROUBLESHOOTING

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Trouble Area

ÑÑÑÑÑÑ

O/D OFF

Light*

Blinks

ÑÑÑÑÑ

Memory*

ÑÑÑÑ

See

Page

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑ

ÑÑÑÑÑ

ÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Harness or connector between No. 1 vehicle speed sensor and ECM.

ÑÑÑÑÑÑ

ÑÑÑÑÑ

ÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

No. 1 vehicle speed sensor.

ÑÑÑÑÑÑ

ÑÑÑÑÑ

ÑÑÑÑ

AT–78

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Combination meter.

ÑÑÑÑÑÑ

ÑÑÑÑÑ

ÑÑÑÑ

AT–78

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

ECM

ÑÑÑÑÑÑ

ÑÑÑÑÑ

ÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑ

ÑÑÑÑÑ

ÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Harness or connector between No.4 solenoid and ECM.

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

No.4 solenoid.

AT–82

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

ECM

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑ

ÑÑÑÑÑ

ÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Harness or connector between No.2 vehicle speed sensor and ECM.

ÑÑÑÑÑÑ

ÑÑÑÑÑ

ÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

No.2 vehicle speed sensor.

ÑÑÑÑÑÑ

ÑÑÑÑÑ

ÑÑÑÑ

AT–86

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

ECM

ÑÑÑÑÑÑ

ÑÑÑÑÑ

ÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑ

ÑÑÑÑÑ

ÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Harness or connector between No.1 solenoid and ECM.

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

No.1 solenoid.

AT–90

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

ECM

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Harness or connector between No.2 solenoid and ECM.

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

No.2 solenoid.

AT–90

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

ECM

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Harness or connector between No.3 solenoid valve and ECM.

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

No.3 solenoid valve.

AT–94

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

ECM

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Harness or connector between O/D direct clutch speed sensor and ECM.

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

O/D direct clutch speed sensor.

AT–98

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

ECM

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

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A304E (1UZ–FE) AUTOMATIC TRANSMISSION

TROUBLESHOOTING

AT–61

*1: “O” mark means “O/D OFF” light blinks once every 2 seconds. “X” mark means “O/D OFF” light never
blinks.
*2: “O” mark means the ECM memorizes the malfunction code if the ECM detects the diag. trouble code
detection condition.
*3: This indicates items for which “2 trip detection logic” is used. With this logic, when a logic malfunction
is first detected, the malfunction is temporarily stored in the ECM memory. If the same case is detected
again during the second drive test, this second detection causes the O/F OFF Light to blink.
The 2 trip repeats the same mode twice. (However, the IG switch must be turned OFF between the 1st trip
and 2nd trip.)

HINT:

If the malfunction returns to normal while a malfunction warning is being output, the O/D OFF indicator
light stops blinking and goes off.

However, the malfunction code is retained in memory until it is cleared from memory.

If the diagnosis system outputs a malfunction code even though the O/D OFF indicator was not
blinking, there is intermittent trouble. Check all the connections in the circuits corresponding to that
code.

If the vehicle speed sensors No.1 and No.2 happen to fail simultaneously, the ECM will neither alert
the driver by blinking the O/D OFF indicator nor record any diagnostic trouble code. It will, however,
decide that the vehicle can be driven only in 1st and none of the other gears, shifting upwards will then
be prohibited.

Codes 46, 62, 63 and 64 are limited to short or open circuits in the electrical system comprised of the
solenoids, wire harnesses and connectors. The ECM is unable to detect mechanical trouble (sticking,
for example) in the solenoid valves.

AT–62

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A304E (1UZ–FE) AUTOMATIC TRANSMISSION

TROUBLESHOOTING

STANDARD VALUE OF ECM TERMINAL

AT0L9–04

(*A=E9, B=E10)

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A304E (1UZ–FE) AUTOMATIC TRANSMISSION

TROUBLESHOOTING

AT–63

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Lexus SC300 / Lexus SC400. Manual — part 76

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