Lexus SC300 / Lexus SC400. Manual — part 661
TERMINALS OF ECU (Cont’d)
TR–32
–
ENGINE TROUBLESHOOTING
Terminals of ECU
STANDARD VALUE OF ECU TERMINALS
Symbols (Terminals No.)
STD Voltage (V)
Condition
BATT (A33) – E1 (B69)
10 ~ 14
Always
IGSW (A1)
IGSW (A1)
+ B (A31) – E1 (B69)
10 ~ 14
IG switch ON
+ B (A31)
+ B1 (A32)
E1 (B69)
10 14
IG switch ON
VC (B41)–E2 (B65)
4.0 ~ 6.0
IG switch ON
Below 1 0
IG switch ON
IDL1 (B64)
E2 (B65)
Below 1.0
IG switch ON
Main or sub throttle valve fully closed.
IDL1 (B64)
IDL2 (B63)
– E2 (B65)
10
14
IG switch ON
(
)
10 ~ 14
IG switch ON
Main or sub throttle valve fully open.
0 1
1 0
IG switch ON
VTA1 (B43)
E2 (B65)
0.1 ~ 1.0
IG switch ON
Throttle valve fully closed.
VTA1 (B43)
VTA2 (B42)
– E2 (B65)
3 0
6 0
IG switch ON
(
)
3.0 ~ 6.0
IG switch ON
Throttle valve fully open.
KS (B66) – E1 (B69)
Pulse generation
(0 and 4 ~ 6)
Idling
THA (B45) – E2 (B65)
1.0 ~ 3.0
Idling, Intake air temp. 20
°
C (68
°
F).
THW (B44) – E2 (B65)
0.1 ~ 1.0
Idling, Water temp. 80
°
C (176
°
F).
STA (B77) – E1 (B69)
6.0 or more
Cranking
#10 (B20), #20 (B19)
E01 (B80)
10 ~ 14
IG switch ON
#10 (B20), #20 (B19)
#30 (B18), #40 (B17)
– E01 (B80)
Pulse generation
Idling
IGT1 (B57), IGT2 (B56) – E1 (B69)
Pulse generation
(0 and 4 ~ 6)
Idling
Below 1.0
IG 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 ~ 14
IG switch ON
4.2 ~ 6.0
Cranking, Sudden racing (6,000 rpm)
FPC (A22) – E1 (B69)
Pulse generation
(0 and 4 ~ 6)
Idling
DI (A21) – E1 (B69)
7.5 or more
Idling
FPU (B73)
E1 (B69)
10 ~ 14
IG switch ON
FPU (B73) – E1 (B69)
Below 2.0
Restarting high temp.
PAG (B74) – E1 (B69)
10 ~ 14
Idling
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ENGINE TROUBLESHOOTING
Standard Value of ECU Terminals
TR–33
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
TR–88
TR–10
0
TR–12
2
TR–13
0
TR–13
6 TR–14
0 TR–1
1
4 TR–14
2
TR–108
TR–1
1
8
TR–12
4
TR–13
2
AC–84
ST–24
IG–24
IG–6
EM–30
A
T–66
IN–32
BE–381
IG–7
IG–9
MATRIX CHART OF PROBLEM SYMPTOMS
When the malfunction code is not confirmed in the diagnostic code check and the problem still can not be con-
firmed in the basic inspection, then proceed to this step and perform troubleshooting according to the numbered
order given in the table below.
The circuits indicated by on the matrix chart can be inspected using the TCCS checker.
–
ENGINE TROUBLESHOOTING
Martrix Chart of Problem Symptoms
TR–35
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