Lexus ES300 (2002 year). Manual — part 395
A53769
FC
E2
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-177
330
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
3
CHECK E.F.I. CIRCUIT OPENING RELAY ASSY (See page
NG
REPLACE E.F.I. CIRCUIT OPENING RELAY
ASSY
OK
4
INSPECT ECM
(a)
Turn the ignition switch ON.
(b)
Measure the voltage between terminal FC and E2 of the
ECM connector.
Voltage: 9 - 14 V
NG
CHECK HARNESS AND CONNECTOR
OK
5
CHECK FUEL PUMP (See page
NG
REPLACE FUEL PUMP
OK
6
CHECK HARNESS AND CONNECTOR(CIRCUIT OPENING RELAY - FUEL PUMP,
FUEL PUMP - E2)
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE ECM
A59757
20
IF6
W - R
Ignition
Switch
ED
W - B
IF3
1E
1C
1B
AM2
IG2
8
Engine Room J/B
E6
E8
ECM
B - W
Battey
FL MAIN
E.F.I.
2
B - G
7
8
8
9
1
8
7
1C
1C
6
1
E6
E6
B - G
1
1
B - R
B - R
IG2
AM2
2
4
3
3
3
2
1
5
E.F.I.
ECU
Relay
5
EF
BR
BR
A
A
B - R
B - O
B - R
W - R
5
17
Driver Side J/B
Driver Side J/B
2G
2G
2G
2G
Engine Room
J/B
J11 J/C
1A
1C
B - O
IGSW
+B
MREL
E1
Engine Room R/B
05-178
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
331
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
ECM POWER SOURCE CIRCUIT
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to terminal IGSW of the ECM and
the E.F.I. ECU relay (Marking: E.F.I.) control circuit in the ECM sends a signal to terminal MREL of the ECM
switching on the E.F.I. ECU relay.
This signal causes current to flow to the coil, closing the contacts of the E.F.I. ECU relay and supplying power
to terminal +B of the ECM.
If the ignition switch is turned off, the ECM continues to switch on the E.F.I. ECU relay for a maximum of 2
seconds for the initial setting of the IAC valve.
WIRING DIAGRAM
056HC-03
A53769
+B
E2
A57021
E2
E1
E10
E8
A53769
E2
IGSW
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-179
332
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
1
INSPECT ECM
(a)
Turn the ignition switch ON.
(b)
Measure the voltage between terminals
+
B and E2 of the
ECM connectors.
Voltage: 9 - 14 V
OK
PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN ON PROBLEM SYMPTOMS TABLE
NG
2
CHECK HARNESS AND CONNECTOR(E1,E2 - BODY EARTH)
(a)
Disconnect the ECM E10 and E8 connector.
(b)
Check for open between the terminals E1 and E2 of the
ECM connector and Body ground.
Resistance: 1
Ω
or less
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
3
INSPECT ECM
(a)
Turn the ignition switch ON.
(b)
Measure the voltage between terminal IGSW and E2 of
the ECM connector.
Voltage: 9 - 14 V
OK
NG
A59714
AM2(30A)
1
5
6
2
3
7
8
4
A56879
IG1
AM1
ST1
ACC
IG2
AM2
ST2
A53769
MREL
E2
05-180
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
333
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
4
CHECK FUSE(AM2)
(a)
Remove the AM2 fuse from the engine room J/B.
(b)
Check the continuity of the AM2 fuse.
NG
CHECK FOR SHORT IN ALL HARNESS AND
COMPONENTS CONNECTED AM2 FUSE
OK
5
CHECK IGNITION OR STARTER SWITCH ASSY
(a)
Check continuity between the connector terminals shown
in the chart below.
Switch
Terminal No.
Resistance
LOCK
All Terminal to Terminal
1M
Ω
or more
ACC
2
⇔
3
1
Ω
or less
ON
2
⇔
3
⇔
4
6
⇔
7
1
Ω
or less
START
1
⇔
2
⇔
4
6
⇔
7
⇔
8
1
Ω
or less
NG
REPLACE IGNITION OR STARTER SWITCH
ASSY
OK
REPAIR OR REPLACE HARNESS AND CONNECTOR
6
INSPECT ECM
(a)
Turn the ignition switch ON.
(b)
Measure the voltage between terminal MREL and E2 of
the ECM connector.
Voltage: 9 - 14 V
NG
CHECK AND REPLACE ECM
OK
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст