Lexus SC300 / Lexus SC400. Service manual — part 853
STANDARD VALUE OF ECU TERMINALS (Cont’d)
Symbols (Terminals No.)
STD Voltage (V)
Condition
ISC1 (B35), ISC2 (B34)
E1 (B69)
10
14
IG switch ON
ISC1 (B35), ISC2 (B34)
ISC3 (B33), ISC4 (B32)
–E1 (B69)
10 ~ 14
IG 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 2.0
Idling
HTL1 (B71), HTR1 (B72)
HTL2 (B52), HTR2 (B53)
– E01 (B80)
10 ~ 14
IG switch ON
EGR1 (B39), EGR2 (B38)
E1 (B69)*
10
14
IG switch ON
EGR1 (B39), EGR2 (B38)
EGR3 (B37), EGR4 (B36)
– E1 (B69)*
10 ~ 14
IG switch ON
EGR (B39) – E1 (B69)
10 ~ 14
IG switch ON
KNK1 (B50), KNK2 (B49) – E1 (B69)
Pulse generation
(Frequency : 6.6 KHz)
Idling
NSW (B76)
E1 (B69)
10 ~ 14
IG switch ON
Other shift position in ”P”, ”N” ranges.
NSW (B76) – E1 (B69)
Below 1.0
IG switch ON
Shift position in ”P”, ”N” ranges.
SPD (A2)–E1 (B69)
Pulse generation
(0 and 10 ~ 14)
IG switch ON
Rotate driving wheel slowly.
TE1 (A20) – E1 (B69)
10 ~ 14
IG switch ON
TE2 (A19) – E1 (B69)
10 ~ 14
IG switch ON
W (A6) E1 (B69)
10 ~ 14
Idling
W (A6)–E1 (B69)
Below 2.0
IG switch ON
AD (A11) – E1 (B69)
10 ~ 14
Idling
ODI (A12) – E1 (B69)
4.0 ~ 6.0
IG switch ON
A/C (A34)
E1 (B69)
Bellow 2.0
A/C switch ON (At idling)
A/C (A34) – E1 (B69)
10 ~ 14
A/C switch OFF
ACMG (A23) E1 (B69)
Below 2.0
A/C switch ON (At idling)
ACMG (A23)–E1 (B69)
10 ~ 14
A/C switch OFF
TR (A37) – E1 (B69)
10 ~ 14
IG switch ON
Below 1 0
IG switch ON
VTO1 (A40)
E2 (B65)
Below 1.0
IG switch ON
Main or sub throttle valve fully closed.
VTO1 (A40)
VTO2 (A39)
– E2 (B65)
3 0
5 5
IG switch ON
(
)
3.0 ~ 5.5
IG switch ON
Main or sub throttle valve fully open.
NEO (A38) – E1 (B69)
4.0 ~ 6.0
IG switch ON
* Only for USA specification vehicles.
TR–34
–
ENGINE TROUBLESHOOTING
Standard Value of ECU Terminals
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:
•
Do not pully the wire harness when disconnecting the
connector.
•
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.
•
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
6.
Disconnect the Check Harness A.
7.
Reconnect the connector to the ECU.
(a) Match the male connector correctly with the female
connector, 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
TERMINALS OF ECU
*1: Only vehicles with ECT.
–
ENGINE TROUBLESHOOTING
Terminals of ECU
TR–35
TERMINALS OF ECU (Cont’d)
*1: Only vehicles with ECT.
*2: Only for USA specification vehicles.
TR–36
–
ENGINE TROUBLESHOOTING
Terminals of ECU
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