Lexus SC300 / Lexus SC400. Manual — part 629
•
Disconnect the SST from the wiring connectors.
SST 09990–01000
4.
REINSTALL ENGINE & ECT ECU TO FLOOR PANEL
(a) Connect the two ECU connectors.
•
Match the male connector correctly with the female
connector, then press them together.
•
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.
(b) Install the ECU with the bolt.
(c) Install the ECU protector with the two nuts.
(d) Install the floor carpet.
(e) Install the instrument panel under cover with the two clips.
5. RECONNECT CABLE TO NEGATIVE TERMINAL OF
BATTERY
FI–135
EFI SYSTEM – Electronic Control System (Engine & ECT ECU)
Fuel Cut RPM
INSPECTION OF FUEL CUT RPM
1.
WARM UP ENGINE
Allow the engine to warm up to normal operating
temperature.
2. CONNECT
TACHOMETER
Connect the test probe of a tachometer to terminal IG of the
check connector.
NOTICE
•
Never allow the tachometer terminal to touch ground as
it could result in damage to the igniter and/or ignition
coil.
•
As some tachometers are not compatible with this
ignition system, we recommend that you confirm the
compatibility of yours before use.
3.
INSPECT FUEL CUT OPERATION
(a) Increase the engine speed to at least 2,500 rpm.
(b) Check for injector operating noise.
(c) Check that when the throttle lever is released, injector
operation noise stops momentarily and then resumes.
HINT:
•
The vehicle should be stopped.
•
Measure with the A/C OFF.
Fuel return rpm: 1,400 rpm
4. REMOVE
TACHOMETER
FI–136
– Electronic Control System (Fuel Cut RPM)
EFI SYSTEM
SERVICE SPECIFICATIONS
SERVICE DATA
Fuel pump
Resistance
0.2 – 3.0
Cold start
injector
Resistance
Fuel leakage
2 – 4
One drop or less per minute
Fuel pressure
regulator
Fuel pressure
at no vacuum
265 – 304 kPa
(2.7 – 3.1 kgf/cm
2
, 38 – 44 psi)
Injector
Resistance
Injection volume
Difference between each cylinder
Fuel leakage
13.4 – 14.2
55 – 70 cc (3.4 – 4.3 cu in.) per 15 sec.
10 cc (0.6 cu in.) or less
One drop or less per minute
Air flow meter
Resistance (THA – E2)
at–20
°
C (–4
°
F)
at 0
°
C (32
°
F)
at 20
°
C (68
°
F)
at 40
°
C (104
°
F)
at 60
°
C (140
°
F)
at 80
°
C (176
°
F)
10 – 20 k
4 – 7 k
2 – 7 k
0.9 – 1.3 k
0.4 – 0.7 k
0.2 – 0.4 k
Throttle body
Throttle body fully closed angle
6
°
Throttle
position
Clearance between
stop screw and lever
Between terminals
Resistance
sensor
(main)
0 mm
0.40 mm
0.65 mm
0 in.
0.016 in.
0.026 in.
VTA1 – E2
IDL1 – E2
IDL1 – E2
VTA1
E2
0.2 – 0.8 k
2.3 k
or less
Infinity
3 3
10 0 k
Throttle valve fully opened position
–
VTA1 – E2
VC – E2
y
3.3 – 10.0 k
4.0 – 9.0 k
Sub–throttle
position
Clearance between
stop screw and lever
Between terminals
Resistance
sensor
(w/ TRAC)
0 mm
0.30 mm
0.50 mm
0 in.
0.012 in.
0.020 in.
VTA2 – E2
IDL2 – E2
IDL2 – E2
VTA2
E2
0.2 – 0.8 k
2.3 k
or less
Infinity
3 3
10 0 k
Throttle valve fully opened position
–
VTA2 – E2
VC – E2
y
3.3 – 10.0 k
4.0 – 9.0 k
Sub–throttle
actuator
(w/ TRAC)
Resistance (ACM – A and A, BCM – B and B)
0.5 – 1.0
ISC valve
Resistance (B1 – S1 and S3, B2 – S2 and S4)
10 – 30
Cold start
injector time
switch
Resistance STA – STJ
below 15
°
C (59
°
F)
above 30
°
C (86
°
F)
STA – Ground
25 – 45
65 – 85
25 – 85
VSV for fuel
pressure
control
Resistance
37 – 44
FI–137
– Service Specifications
EFI SYSTEM
SERVICE DATA (Cont’d)
Water temp.
sensor
Resistance
at –20
°
C (–4
°
F)
at 0
°
C (32
°
F)
at 20
°
C (68
°
F)
at 40
°
C (104
°
F)
at 60
°
C (140
°
F)
at 80
°
C (176
°
F)
10 – 20 k
4 – 7 k
2 – 7 k
0.9 – 1.3 k
0.4 – 0.7 k
0.2 – 0.4 k
EGR gas
temp.
sensor
Resistance
at 50
°
C (112
°
F)
at 100
°
C (212
°
F)
at 150
°
C (302
°
F)
69 – 89 k
12 – 15 k
2 – 4 k
Main oxygen
sensor
Heater coil resistance
5.1 – 6.3
Sub–oxygen
sensor
Heater coil resistance
5.1 – 6.3
ECU
HINT:
Perform all voltage and resistance measurements with the ECU connected.
Verify that the battery voltage in 11 V or above with the ignition switch is ON.
Voltage
Terminals
Condition
STD voltage (V)
BATT – E1
–
10 – 14
IGSW
+B – E1
+B1
IG SW ON
10 – 14
VC – E2
–
4.0 – 6.0
IDL1
E2
Throttle (or sub–throttle) valve fully closed
1 or less
IDL1
IDL2
– E2
IG SW ON
Throttle (or sub–throttle) valve fully open
10 – 14
VTA1
E2
Throttle (or sub–throttle) valve fully closed
0.1 or less
VTA1
VTA 2
– E2
Throttle (or sub–throttle) valve fully open
3.0 – 6.0
KS – E1
Idling
Pulse generation
THA – E2
THW – E2
Idling
Intake air temp. 20
°
C (68
°
F)
1.0 – 3.0
THW – E2
Idling
Engine coolant temp. 80
°
C (176
°
F)
0.1 – 1.0
STA – E1
Cranking
6.0 or more
#10
#20
E01
IG SW ON
10 – 14
#20
#30
#40
–
E01
E02
Idling
Pulse generation
IGT1
IGT2
– E1
Idling
Pulse generation
FI–138
EFI SYSTEM – Service Specifications
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