Toyota T100 1996 Service Manual page 508

DI−244
DTC P1600
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 Open in back up power source circuit
HINT:
If DTC P1600 appear, the ECM does not store another DTC.
WIRING DIAGRAM
W−R
Battery
1996 TOYOTA T100 (RM449U)
DIAGNOSTICS
ECM BATT Malfunction
DTC Detecting Condition
1 2
2 2
EFI
R/B No.2
− ENGINE (5VZ−FE)
S Open in back up power source circuit
S ECM
8
B−G
EA1
Trouble Area
2 14
BATT
B−G
E4 E4
(M/T)(A/T)
DI0V8−01
ECM
S00899