Toyota Camry Manual page 1396

ECM Power Source Circuit
CIRCUIT INSPECTION
When the ignition switch is turned on, battery positive voltage is applied to terminal IGSW of the ECM and
the EFI main relay (Marking: EFI) control circuit in the ECM sends a signal to terminal MREL of the ECM
switching on the EFI main relay.
This signal causes current to flow to the coil, closing the contacts of the EFI, main relay and supplying power
to terminals +B of the ECM.
If the ignition switch is turned off, the ECM continues to switch on the EFI main relay for a maximum of 2
seconds for the initial setting of the IAC valve.
WIRING DIAGRAM
Instrument Panel J/B
3
B–R
1K
6
5
7
W–R
1K
FL
MAIN
B–G
Battery
DIAGNOSTICS
7
IGN
1W
5
W–R
1B
4
2L
EFI
AM2
Relay
1 2A
Fusible
Link
Block
1 1
B
F4 F6
– ENGINE (1MZ–FE)
B–R
B–Y
J27
B–W
J35
2
2J 7 2K
3
1
Engine Room
J/B
5 2
EFI
2F
4
EB
Author :
2
E7
Junction
Connector
16
B
B
B–Y
J28 E7
C 8
C
B–W
E7
J35
Junction
Connector
J22
Junction
Connector
17
BR
BR
E10
A
A
EC
Date :
DI–369
DI4DU–01
ECM
IGSW
+B
B+
MREL
E1
A07450
604