1991 LEXUS SC400 Service Repair Manual

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stop start power steering fluid spark plugs mileage lane assist engine coolant

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Page 3617 of 4087

TERMINALS OF ECU
±
ENGINE TROUBLESHOOTING Terminals of ECUTR±31
WhereEverybodyKnowsYourName

Page 3618 of 4087

TERMINALS OF ECU (Cont'd)
TR±32±
ENGINE TROUBLESHOOTING Terminals of ECU
WhereEverybodyKnowsYourName

Page 3619 of 4087

PARTS LOCATION
±
ENGINE TROUBLESHOOTING Parts locationTR±31
WhereEverybodyKnowsYourName

Page 3620 of 4087

WIRING DIAGRAM
TR±32±
ENGINE TROUBLESHOOTING Wiring Diagram
WhereEverybodyKnowsYourName

Page 3621 of 4087

±
ENGINE TROUBLESHOOTING Wiring DiagramTR±33
WhereEverybodyKnowsYourName

Page 3622 of 4087

LEXUS SC400 1991 Service Repair Manual
STANDARD VALUE OF ECU TERMINALS
Symbols (Terminals No.)STD Voltage (V)Condition
BATT (A33) ± E1 (B69)10 ~ 14Always
IGSW (A1)IGSW (A1)
+ B (A31)± E1 (B69) 10 ~ 14IG switch ON+ B (A31)
+ B1 (A32)
E1

STANDARD VALUE OF ECU TERMINALS
Symbols (Terminals No.)STD Voltage (V)Condition
BATT (A33) ± E1 (B69)10 ~ 14Always
IGSW (A1)IGSW (A1)
+ B (A31)± E1 (B69) 10 ~ 14IG switch ON+ B (A31)
+ B1 (A32)
E1 (B69)10 14IG switch ON
VC (B41)±E2 (B65)4.0 ~ 6.0IG switch ON
Below 1 0IG switch ON
IDL1 (B64)E2 (B65)
Below 1.0IG switch ON
Main or sub throttle valve fully closed.IDL1 (B64)
IDL2 (B63)± E2 (B65)
10 14IG switch ON()10 ~ 14IG switch ON
Main or sub throttle valve fully open.
01 10IG switch ON
VTA1 (B43)E2 (B65)
0.1 ~ 1.0IG switch ON
Throttle valve fully closed.VTA1 (B43)
VTA2 (B42)± E2 (B65)
30 60IG switch ON()3.0 ~ 6.0IG switch ON
Throttle valve fully open.
KS (B66) ± E1 (B69)Pulse generation(0 and 4 ~ 6)Idling
THA (B45) ± E2 (B65)1.0 ~ 3.0Idling, Intake air temp. 20 5C (68 5F).
THW (B44) ± E2 (B65)0.1 ~ 1.0Idling, Water temp. 80 5C (176 5F).
STA (B77) ± E1 (B69)6.0 or moreCranking
#10 (B20), #20 (B19)E01 (B80)10 ~ 14IG switch ON#10 (B20), #20 (B19)
#30 (B18), #40 (B17)± E01 (B80)Pulse generationIdling
IGT1 (B57), IGT2 (B56) ± E1 (B69)Pulse generation
(0 and 4 ~ 6)Idling
Below 1.0IG switch ON
IGF1 (B58), IGF2 (B59) ± E1 (B69)Pulse generation(0 and 4 ~ 6)Idling
G1 (B26), G2 (B25) ± G1 (B6)Pulse generation
(±1.0 ~ +1.0 or higher)Idling
NE (B27) ± NE (B7)Pulse generation
(±0.8 ~ +0.8 or higher)Idling
MREL (A24) ± E1 (B69)10 ~ 14IG switch ON
4.2 ~ 6.0Cranking, Sudden racing (6,000 rpm)
FPC (A22) ± E1 (B69)Pulse generation (0 and 4 ~ 6)Idling
DI (A21) ± E1 (B69)7.5 or moreIdling
FPU (B73) E1 (B69)10 ~ 14IG switch ONFPU (B73) ± E1 (B69)Below 2.0Restarting high temp.
PAG (B74) ± E1 (B69)10 ~ 14Idling
±
ENGINE TROUBLESHOOTING Standard Value of ECU TerminalsTR±33
WhereEverybodyKnowsYourName

Page 3623 of 4087

LEXUS SC400 1991 Service Repair Manual
STANDARD VALUE OF ECU TERMINALS (Contd)
Symbols (Terminals No.)STD Voltage (V)Condition
ISC1 (B35), ISC2 (B34)E1 (B69)10 14IG switch ONISC1 (B35), ISC2 (B34)
ISC3 (B33), ISC4 (B32)±E1 (B69)10 ~ 14I

STANDARD VALUE OF ECU TERMINALS (Cont'd)
Symbols (Terminals No.)STD Voltage (V)Condition
ISC1 (B35), ISC2 (B34)E1 (B69)10 14IG switch ONISC1 (B35), ISC2 (B34)
ISC3 (B33), ISC4 (B32)±E1 (B69)10 ~ 14IG switch ON
VF1 (B29), VF2 (B28) ± E1 (B69)1.0 ~ 4.0
Maintain engine speed at 2,500 rpm for two
minutes
after warming up then return to idling.
OXL1 (B48), OXR1 (B47) ± E1 (B69)Pulse generation(0 ~ 1.0)Maintain engine speed at 2,500 rpm for two
minutes
after warming up.
HTL1 (B71), HTR1 (B72)E01 (B80)Below 2.0IdlingHTL1 (B71), HTR1 (B72)
HTL2 (B52), HTR2 (B53)± E01 (B80)10 ~ 14IG switch ON
EGR1 (B39), EGR2 (B38)E1 (B69)*10 14IG switch ONEGR1 (B39), EGR2 (B38)
EGR3 (B37), EGR4 (B36)± E1 (B69)* 10 ~ 14IG switch ON
EGR (B39) ± E1 (B69)10 ~ 14IG switch ON
KNK1 (B50), KNK2 (B49) ± E1 (B69)Pulse generation
(Frequency : 6.6 KHz)Idling
NSW (B76) E1 (B69)
10 ~ 14IG switch ON
Other shift position in ºPº, ºNº ranges.
NSW (B76) ± E1 (B69)
Below 1.0IG switch ON
Shift position in ºPº, ºNº ranges.
SPD (A2)±E1 (B69)Pulse generation (0 and 10 ~ 14)IG switch ON
Rotate driving wheel slowly.
TE1 (A20) ± E1 (B69)10 ~ 14IG switch ON
TE2 (A19) ± E1 (B69)10 ~ 14IG switch ON
W (A6) E1 (B69)10 ~ 14IdlingW (A6)±E1 (B69)Below 2.0IG switch ON
AD (A11) ± E1 (B69)10 ~ 14Idling
ODI (A12) ± E1 (B69)4.0 ~ 6.0IG switch ON
A/C (A34) E1 (B69)Bellow 2.0A/C switch ON (At idling)A/C (A34) ± E1 (B69)10 ~ 14A/C switch OFF
ACMG (A23) E1 (B69)Below 2.0A/C switch ON (At idling)ACMG (A23)±E1 (B69)10 ~ 14A/C switch OFF
TR (A37) ± E1 (B69)10 ~ 14IG switch ON
Below 1 0IG switch ON
VTO1 (A40)E2 (B65)
Below 1.0IG switch ON
Main or sub throttle valve fully closed.VTO1 (A40)
VTO2 (A39)± E2 (B65)
30 55IG switch ON()3.0 ~ 5.5IG switch ON
Main or sub throttle valve fully open.
NEO (A38) ± E1 (B69)4.0 ~ 6.0IG switch ON
* Only for USA specification vehicles. TR±34
±
ENGINE TROUBLESHOOTING Standard Value of ECU Terminals
WhereEverybodyKnowsYourName

Page 3624 of 4087

LEXUS SC400 1991 Service Repair Manual
TERMINALS OF ECU
Connectors of the engine (& ECT) ECU are water±proof and
are the bolt type.
For water proof type connectors, in order to measure the volt-
age of ECU terminals and the resistance o

TERMINALS OF ECU
Connectors of the engine (& ECT) ECU are water±proof and
are the bolt type.
For water proof type connectors, in order to measure the volt-
age of ECU terminals and the resistance of connected parts,
connect the inspection sub wire harness between the ECU
and vehicle wire harness, then perform the inspection.
The inspection method of inserting a tester probe from the
other side of connector noticeably reduces the water±proof
ability.
Disconnect the connector by fully loosening the bolt.
PREPARATION
1. Turn the ignition switch to LOCK position.
2. Turn up the passenger side floor mat.
3. Remove the ECU protector.
4. Disconnect the connector from the ECU.After completely loosening the bolt, the two parts of the con-
nector can be separated.
NOTICE:
w Do not pully the wire harness when disconnecting the
connector.
w When disconnecting the connector, the ECU's backup
power source is cut off, so the malfunction codes, etc.
recorded in the ECU memory are cancelled.
w Never insert a tester probe or male terminal used for
inspection purposes into the female terminal of the
vehicle wire harness. Otherwise, the female terminal may
be widened, which can result in faulty connection.
5. Connect the Check Harness A between ECU and
connector of vehicle wire harness.
SST 09990±01000
HINT: The arrangement of the check connector terminals are
the same as those of the ECU.
See page TR±35
6. Disconnect the Check Harness A.
7. Reconnect the connector to the ECU. (a) Match the male connector correctly with the femaleconnector, then press them together.
(b) Tighten the bolt
Make sure the connector is completely connected, by tight-
ening the bolt until there is a clearance of less than 1 mm
(0.04 in.) between bottom of the male connector and end of
the female connector.
8. Install the ECU protector and floor mat.
TR±34
±
ENGINE TROUBLESHOOTING Terminals of ECU
WhereEverybodyKnowsYourName

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