Toyota T100 1996 Service Manual page 506

DI−242
DTC P1500
CIRCUIT DESCRIPTION
When the engine is cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery positive volt-
age is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection
volume for the starting injection control and after−start injection control.
DTC No.
P1500 No starter signal to ECM
HINT:
In this circuit, diagnosis can only be made in the check mode.
WIRING DIAGRAM
1996 TOYOTA T100 (RM449U)
DIAGNOSTICS
Starter Signal Circuit Malfunction
DTC Detecting Condition
− ENGINE (5VZ−FE)
S Open or short in starter signal circuit
S Open or short in ignition switch or starter relay circuit
S ECM
Trouble Area
DI9AG−01
S00900