1991 LEXUS SC400 Service Repair Manual

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Page 2729 of 4087

$LEXUS SC400 1991 Service Repair Manual Diag. Code 51Switch Condition Signal Circuit CIRCUIT DESCRIPTION Neutral Start Switch Signal The ECU uses the signals from the neutral start switch to determine whether\ the transmission is in park$

Page 2730 of 4087

LEXUS SC400 1991 Service Repair Manual
DIAGNOSTIC CHART
DIAGNOSTIC
CHART
NG (NSW)
Check for input signal.
Proceed to next circuit inspection shown
on maxtrix chart (See page TR±35).
Check resistance of throttle
position sensor.
Check in

Page 2731 of 4087

LEXUS SC400 1991 Service Repair Manual
OKNG
OKNG
INSPECTION PROCEDURE
1Check output condition of diag. code 51.
C
OK
Hint
PSetting the test mode.
(2) Turn ignition switch OFF.
(2) Connect terminals TE2 and E1 and TDCL.
(2) Turn ignition s

Page 2732 of 4087

LEXUS SC400 1991 Service Repair Manual
NGOK
OKNG
3Disconnect A/C control assembly connector, check voltage between terminal MGC of A/C con-
trol assembly connector and body ground.
C
OK
P(2) Remove air conditioner control assembly.
(2) Di

Page 2733 of 4087

$LEXUS SC400 1991 Service Repair Manual Neutral Start Switch Circuit CIRCUIT DESCRIPTION The neutral start switch goes on when the shift lever is in the N or P shif\ t position. When it goes on the terminal NSW of the ECU is grounded to bo$

Page 2734 of 4087

LEXUS SC400 1991 Service Repair Manual
OK
NG
Type I
NG
Type II
NG
OK
OKNG
INSPECTION PROCEDURE
1Check output condition of diag. code 51.
C
P(2) Connect terminals TE2 and E1 of TDCL.
(2) Turn ignition switch on.
(2) Crank the engine.
(2) C

Page 2735 of 4087

LEXUS SC400 1991 Service Repair Manual
ECU Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned on, battery voltage
is applied to the terminal IG SW of the ECU, and the
main relay control circuit in the ECU sends a

Page 2736 of 4087

LEXUS SC400 1991 Service Repair Manual
DIAGNOSTIC CHART
DIAGNOSTIC
CHART
Check for short in all the harness and
components connected to IGN fuse.
Check voltage of terminal M±REL.
Check for open in harness and connector
between battery a

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air suspension warning light deactivate passenger airbag open gas tank trunk spare tire

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