Toyota ZZT230 series Repair Manual page 344

DTC
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.
OTCNo.
Open
P1600
K
HINT:
DTC P1600 appear, lhe ECM does not store another DTC.
WIRING DIAGRAM
)
FL Main
'
Battery
INSPECTION PROCEDURE
HINT:
Read freeze frame
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
at the time of the malfunction.
)
DIAGNOSTICS
ECM BATT Malfunction
P1600
source
DTC Detecting Condition
in back
circuit
up power
Engine
8-R
data
using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records
ENGINE
Open
•
in back up power source circuit
•ECM
Room JIB
Trouble Area
ECM
w
Dl-133
or
rich, etc.