1991 LEXUS SC400 Service Repair Manual

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Page 3385 of 4087

LEXUS SC400 1991 Service Repair Manual
Diagnosis Inspection (Test Mode)
Compared to the normal mode, the test mode has high sensing
ability to detect malfunctions.
It can also detect malfunctions in the starter signal circuit, the IDL
con

Diagnosis Inspection (Test Mode)
Compared to the normal mode, the test mode has high sensing
ability to detect malfunctions.
It can also detect malfunctions in the starter signal circuit, the IDL
contact signal of the throttle position sensor, air conditioner signal
and neutral start switch signal.
Furthermore, the same diagnostic items which are detected in the
normal mode can also be detected in the test mode.
DIAGNOSTIC CODE CHECK
1. Initial conditions.(a) Battery voltage 11 V or more.
(b) Throttle valve fully closed (throttle position sensor IDLpoints closed).
(c) Transmission in neutral position.
(d) Air conditioner switched off.
2. Turn ignition switch off.
3. Using SST, connect terminals TE2 and E1 of TDCL. SST 09843±18020
4. Turn ignition switch on. HINT:
wTo confirm that the test mode is operating, check that the
ºCHECKº engine warning light flashes when the ignition
switch is turned to ON.
w If the ºCHECKº engine warning light does not flash,
proceed to tro ubleshooting of the TE2 terminal circuit on
page TR±146 .
5. Start the engine.
6. Simulate the conditions of the malfunction described by the customer.
7. After the road test, using SST, connect terminals TE1 and E1
of TDCL or check connector.
SST 09843±18020
8. Read the diagnostic code on ºCHECKº engine warning light on the combination meter (See page TR±11).
9. After completing the check, disconnect terminals TE1, TE2 and E1, and turn off the display.
HINT:
wThe test mode will not start if terminals TE2 and E1 are
connected after the ignition switch is turned on.
w When the engine is not cranked, diag. codes º43º
(Starter signal) output, but this is not abnormal.
w When the automatic transmission shift lever is in the ºDº,
º2º, ºLº or ºRº shift position, or when the air conditioner
is on or when the accelerator pedal is depressed, code
º51º (Switch condition signal) is output, but this is not
abnormal.
TR±12
±
ENGINE TROUBLESHOOTING Diagnosis System
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Page 3386 of 4087

LEXUS SC400 1991 Service Repair Manual
DIAGNOSTIC CODE CLEARANCE
1. After repair of the trouble areas, the diagnostic code retainedin the ECU memory must be cleared out by removing the EFI
fuse (30A) from R/B No. 2 for 10 seconds or more

Page 3387 of 4087

$LEXUS SC400 1991 Service Repair Manual DIAGNOSTIC CODE CHART HINT: Parameters listed in the chart may not be exactly same as your reading \ due to type of the instruments or other factors. *4: See page TR±21. TR±14 ± ENGINE TROUBLESHOO$

Page 3388 of 4087

$LEXUS SC400 1991 Service Repair Manual If a malfunction code is displayed during the diagnostic code check in tes\ t mode, check the circuit for that code listed in the table below (Proceed to the page given for that circuit). Tro ble Are$

Page 3389 of 4087

LEXUS SC400 1991 Service Repair Manual
DIAGNOSTIC CODE CHART (Contd)
* 3, 4: See page TR±20, 21.
TR±16
±
ENGINE TROUBLESHOOTING Diagnostic Code Chart
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Page 3390 of 4087

LEXUS SC400 1991 Service Repair Manual
ºCHECKº Engine
Tro ble Area
CHECK Engine
Warning Light *Memory*See PageTrouble AreaNormal
ModeTest
ModeMemory* See Page
w Open or short in water temp. sensor circuit.
w Water temp. sensor
w EC

Page 3391 of 4087

LEXUS SC400 1991 Service Repair Manual
DIAGNOSTIC CODE CHART (Contd)
TR±18±
ENGINE TROUBLESHOOTING Diagnostic Code Chart
WhereEverybodyKnowsYourName

Page 3392 of 4087

LEXUS SC400 1991 Service Repair Manual
Trouble Area
ºCHECKº
Engine Warning
Light *
Memory* See PageTrouble Area
Normal
ModeTest
Mode
MemorySee Page
w Open or short in air flow meter circuit.
w Air flow meter
w ECU
ONN.A.TR±88
wECU

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