Toyota Camry Manual page 1393

DI–366
DTC P1600
CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal BATT of the ECM even when the ignition switch is OFF for
use by the DTC memory and air–fuel ratio adaptive control value memory, etc.
DTC No.
P1600 Open in back up power source circuit
HINT:
If DTC P1600 appear, the ECM does not store another DTC.
WIRING DIAGRAM
1
B–G
F4
FL
MAIN
Battery
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand–held tester or OBD II scan tool. Because free frame records
the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining
whether the vehicle was running or stopped, the engine warmed up or not, the air–fuel ratio lean or rich, etc.
at the time of the malfunction.
DIAGNOSTICS
ECM BATT Malfunction
DTC Detecting Condition
Fusible
Link
Block
1
B
F6
– ENGINE (1MZ–FE)
D Open in back up power source circuit
D ECM
Engine Room J/B No.2
8
1
EFI
2J
2A
Author :
Trouble Area
ECM
1
B–Y
BATT
E7
Date :
DI089–06
S05470
601