Starter Signal - Toyota 2VZ-FE Manual

Diag. Code
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 bat-
tery voltage is applied to terminal STA of the ECU. The STA signal is mainly used to increase the fuel
injection volume for the starting injection control and after–start injection control.
Code No.
No STA signal to ECU until engine
43
speed reaches 800 rpm with vehicle not
moving.
DIAGNOSTIC CHART
Check starter operation.
Check voltage between terminals STA
and E1 of ECU connector.
Replace ECU. *
WIRING DIAGRAM AND ECU CONNECTORS
ENGINE TROUBLESHOOTING
43

Starter Signal

Diagnosis
– Circuit Inspection
Trouble Area
· Open or short in starter signal circuit.
· Open or short in IG switch circuit
· ECU
Check starter circuit.
Check harness and connector
between ECU and terminal STA
(50) of starter.
* When diag. code 43 is not displayed, proceed
to next circuit inspection shown on matrix chart
(See page TR–23).
TR–69