1991 LEXUS SC400 Service Repair Manual

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Page 3657 of 4087

LEXUS SC400 1991 Service Repair Manual
Diag. Code 13RPM Signal Circuit (No. 2)
CIRCUIT DESCRIPTION
Refer to RPM signal circuit (No. 1) on page TR±46.
Code No.Diagnostic Code Detecting ConditionTrouble Area
13
No NE signal to ECU for 0.1

Page 3658 of 4087

LEXUS SC400 1991 Service Repair Manual
Diag. Code 13RPM Signal Circuit (No.2)
CIRCUIT DESCRIPTION
Refer to RPM signal circuit (No. 1) on page TR±48.
Code No.Diagnostic Code Detecting ConditionTrouble Area
No NE signal to ECU for 0.1 sec.

Page 3659 of 4087

LEXUS SC400 1991 Service Repair Manual
MEMO ±
ENGINE TROUBLESHOOTINGTR±53
WhereEverybodyKnowsYourName

Page 3660 of 4087

LEXUS SC400 1991 Service Repair Manual
Diag. Code 14, 15Ignition Signal Circuit
CIRCUIT DESCRIPTION
The ECU determines the ignition timing, turns on Tr1 at a predetermined angle (5CA) before the desired
ignition timing and outputs an ig

Page 3661 of 4087

LEXUS SC400 1991 Service Repair Manual
DIAGNOSTIC CHART
DIAGNOSTIC
CHART
Refer to inspection procedure in details.
HINT: If diag. code 14 is displayed, check No. 1 igniter circuit. If diag. code 15 is displayed, check No. 2 igniter circ

Page 3662 of 4087

LEXUS SC400 1991 Service Repair Manual
OKNG
OKNG
OKNG
INSPECTION PROCEDURE
HINT: If diag. code 14 is displayed, check No. 1 igniter circuit. If diag. code 15 is displayed, check No. 2 igniter circuit.
1Check for Spark.
C
OK
Hint
Disconne

Page 3663 of 4087

LEXUS SC400 1991 Service Repair Manual
OKNG
OKNG
4Check voltage between terminals IGT1, 2 of engine and & ECT ECU connector and body ground.
C
OK
PConnect the Check Harness A.
(See page TR±30).
Measure voltage between terminals IGT1, 2

Page 3664 of 4087

$LEXUS SC400 1991 Service Repair Manual OKNG OKNG 6Check for open and short in harness and connector between ignition relay and \ ignition coil, ignition coil and igniter (See page IN±27). Repair or replace harness or connector #Check ign$

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