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G34820
3
2
5
Battery
FL MAIN
1
2
B--W
ECM
EB1
E24
6
B
EFI MAIN Relay
R--W
EFI
B--W
IE4
Engine Room R/B and J/B
EB1
8
4
B--O
1
1
1
1
1
1
R--W
B--W
1A
A
A
J18
J/C
+B
MREL
B--W
42
GR
B
IE1
8
E24
J49
J/C
1
61
B--W
A
A
R--W
+B
E24
1
B--W
--
DIAGNOSTICS
ECD SYSTEM (1ND--TV)
05--133
COROLLA Supplement (RM1129E)
DTC
P0685
ECM/PCM POWER RELAY CONTROL
CIRCUIT / OPEN
CIRCUIT DESCRIPTION
The battery supplies power to teB of the ECM even when the ignition switch is turned to OFF (up
to 15 seconds).
DTC No.
DTC Detection Condition
Trouble Area
P0685
S
After ignition switch is turned to OFF, voltage supplied to ter-
minal +B is cut earlier than minimum threshold duration
(A DTC is set when a malfunction is detected, but the MIL is
not illuminated)
S
After ignition switch is turned to OFF, voltage supplied to ter-
minal +B continues after threshold duration elapsed
(A DTC is set when a malfunction is detected, but the MIL is
not illuminated)
S
Open in EFI MAIN relay circuit
S
EFI MAIN relay
S
ECM
HINT:
S
DTC P0685 is set when the ignition switch is turned to OFF.
S
If DTC P0685 is set, the ECM does not store other DTCs.
WIRING DIAGRAM
05CPX--10
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TOYOTA COROLLA REPAIR MANUAL SUPP 1129E