Dtc P1600 Emc Batt Malfunction - Toyota 1 MZ–FE Manual

DTC P1600 EMC BATT Malfunction

CIRCUIT DESCRIPTION
Battery voltage is supplied to terminal BATT of the ECM even when the ignition switch is OFF for use by
the diagnostic trouble code memory and air–fuel ratio adaptive control value memory, etc.
Diagnostic Trouble Code Detecting Condition
DTC No.
P1600 Open in back up power source circuit.
HINT: If DTC P1600 appear, the ECM does not store another diagnostic trouble code.
DIAGNOSTIC CHART
Check voltage of terminal BATT.
Check EFI fuse.
Check and repair harness or connector between battery,
EFI fuse and ECM.
WIRING DIAGRAM
1MZ–FE ENGINE – CIRCUIT INSPECTION
Open in back up power source circuit.
ECM
Trouble Area
Check and replace ECM.
Check for short in all the harness and
components connected to EFI fuse.
EG2–559