1991 LEXUS SC400 Service Repair Manual

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Page 2665 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 2666 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 2667 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 2668 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 2669 of 4087

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

Page 2670 of 4087

LEXUS SC400 1991 Service Repair Manual
OKNG
8Check Ignition Relay.
C
OK
P
C
OK
Remove ignition relay.
Check continuity between terminals of ignition relay
shown below.
(2) Apply battery voltage between terminals 3 and 6, 4and 5.
(2) Check

Page 2671 of 4087

LEXUS SC400 1991 Service Repair Manual
NGOK
OKNG
9Disconnect igniter connector and check voltage between terminals IGT1, 2 of engine & ECT
ECU connector and body ground.
C
OK
PDisconnect igniter connector.
Connect engine & ECT ECU connect

Page 2672 of 4087

$LEXUS SC400 1991 Service Repair Manual Diag. Code 16ECT Control Signal Malfunction CIRCUIT DESCRIPTION The signal from the ECT CPU retards the ignition timeing of the engine duri\ ng ECT gear shifting, thus mo- mentarily reducing torque$

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