| CAUTION | If ECM replacement is instructed in following testing, always ensure ECM connectors and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. |
Circuit Description
While engine is being cranked, battery voltage is applied to ECM terminal STA. Signal is mainly used to increase fuel injection volume for starting injection control and after-start injection control. DTC is set when ECM does not receive starter signal. Possible causes are
- Starter signal open or short circuit.
- Ignition switch or starter relay open or short circuit.
- ECM.
Note. Scan tester diagnosis can only be attempted with Toyota scan tester operated in CHECK mode.