Toyota Automobile Accessories p1600 User Manual

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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