Lexus ES300 (1997 year). Service manual — part 339
–
DIAGNOSTICS
ENGINE
DI–133
285
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
HINT:This diagnostic chart is based on the premise that the engine is cranked normally. If the engine is not
cranked, proceed to the problem symptoms table on page
hand–held tester
1
Connect LEXUS hand–held tester and check STA signal.
PREPARATION:
(a)
Connect the LEXUS hand–held tester to the DLC3.
(b)
Turn ignition switch ON and push the LEXUS hand–held tester main switch ON.
CHECK:
Read STA signal on the LEXUS hand–held tester while starter operates.
OK:
Ignition switch position
ON
START
STA signal
OFF
ON
OK
Proceed to next circuit inspection shown on
problem symptom table (See page
).
NG
2
Check for open in harness and connector between ECM and starter relay
(See page
).
NG
Repair or replace or connector.
OK
Check and replace ECM (See page
).
A00242
START
STA(+)
BE6653
S04163
DI–134
–
DIAGNOSTICS
ENGINE
286
1997 LEXUS ES300 (RM511U)
OBD II scan tool (excluding LEXUS hand–held tester)
1
Check voltage between terminal STA of ECM connector and body ground.
PREPARATION:
Remove the glove compartment (See page
).
CHECK:
Measure voltage between terminal STA of ECM connector and
body ground during engine cranking.
OK:
Voltage: 6 V or more
OK
Proceed to next circuit inspection shown on
problem symptom table (See page
).
NG
2
Check for open in harness and connector between ECM and starter relay
(See page
).
NG
Repair or replace harness or connector.
OK
Check and replace ECM (See page
).
S06672
Ignition
Switch
Instrument Panel J/B
B–R
W–R
B–R
W–R
IGN
3
7
5
5
1K
1K
7
6
1W
1B
B–Y
2L
2J
2K
2F
2A
AM2
1
4
4
2
7
1
2
3
5
EFI
EFI
Relay
B
1
1
F8
F6
Fusible
Link
Block
FL
MAIN
B–G
Battery
W–B
EC
ED
ECM
Junction
Connector
B
B
J28
J29
B–Y
E7
23
16
E8
A
A
Junction
Connector
J24
E1
BR
BR
+B
Engine Room
J/B
–
DIAGNOSTICS
ENGINE
DI–135
287
1997 LEXUS ES300 (RM511U)
ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to the coil, closing the contacts of
the EFI main relay (Marking: EFI) and supplying power to the terminal
+
B of the ECM.
WIRING DIAGRAM
DI0A8–01
A00243
ON
E1(–)
+B(+)
BE6653
P23885
DI–136
–
DIAGNOSTICS
ENGINE
288
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check voltage between terminals
+
B and E1 of ECM connectors.
PREPARATION:
(a)
Remove the glove compartment (See page
).
(b)
Turn ignition switch ON.
CHECK:
Measure voltage between terminals
+
B and E1 of ECM con-
nectors.
OK:
Voltage: 9
∼
14 V
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
NG
2
Check for open in harness and connector between terminal E1 of ECM and body
ground (See page
).
NG
Repair or replace harness or connector.
OK
3
Check EFI main relay (Marking: EFI) (See page
NG
Replace EFI main relay.
OK
4
Check EFI fuse (See page
,
).
NG
Check for short in all the harness and
components connected to EFI fuse.
OK
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