Toyota p1600 Automobile Accessories User Manual


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A05723
EFI
B–R
2A
2F
Engine Room J/B
W
E2
FL Main
Battery
1
ECM
BATT
8
1
–DIAGNOSTICS ENGINE
DI–133
2000 CELICA (RM744U)
DTC P1600 ECM BATT Malfunction
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. DTC Detecting Condition Trouble Area
P1600 Open in back up power source circuit
SOpen in back up power source circuit
SECM
HINT:
If DTC P1600 appear, the ECM does not store another DTC.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand–held tester or OBD II scan tool. Because freeze 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.
DI38N–03