DI–133
DIAGNOSTICS
–
ENGINE
DI38N–03
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.
P1600
DTCDetectingCondition
Open in back up power source circuit
TroubleArea
S Open in back up power source circuit
S ECM
HINT:
If DTC P1600 appear, the ECM does not store another DTC.
WIRING DIAGRAM
ECM
Engine Room J/B
EFI
8
1
2A
1
E2
B–R
BATT
W
2F
FL Main
Battery
A05723
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.
2000 CELICA (RM744U)
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