Pinout Values and Diagnostic Parameters

2AR-FE STARTING: SMART KEY SYSTEM: TERMINALS OF ECU

1. CHECK MAIN BODY ECU (INSTRUMENT PANEL J/B)





(a) Disconnect the IR, IA, IK, ID, IF, IM E6, E7 and E8 ECU connectors.

(b) Measure the voltage and resistance of the wire harness side connector.





If the result is not as specified, there may be a malfunction on the wire harness side.

(c) Reconnect the ECU connectors.

(d) Measure the voltage of the connector.





HINT
*1: Voltage is output only when the engine is cranking.

*2: Voltage is output for 0.3 seconds when the engine is cranking to start. Disconnect the C24 connector from the ECM and ST CUT relay before measuring the voltage.

*3: Remove the ST CUT relay before measuring the voltage.

If the result is not as specified, the ECU may have a malfunction.

(e) Using an oscilloscope, check the signal waveform of the ECU.

(1) Waveform 1





Waveform 1 (Reference):





HINT
As the vehicle speed increases, the wavelength shortens.

(2) Waveform 2





Waveform 2 (Reference):





HINT
As the engine revolution speed increases, the wavelength shortens.

(3) Waveform 3





Waveform 3 (Reference):





2. CHECK CERTIFICATION ECU





(a) Disconnect the E58 ECU connector.

(b) Measure the voltage and resistance of the wire harness side connector.





If the result is not as specified, there may be a malfunction on the wire harness side.

(c) Reconnect the ECU connector.

(d) Measure the voltage of the connector.





If the result is not as specified, the ECU may have a malfunction.

3. CHECK ECM





(a) Disconnect the C24 and A24 ECM connectors.

(b) Measure the voltage and resistance of the wire harness side connectors.





If the result is not as specified, there may be a malfunction on the wire harness side.

(c) Reconnect the ECM connectors.

(d) Measure the voltage of the connectors.





HINT
*1: Voltage is output only when the engine is cranking.

If the result is not as specified, the ECM may have a malfunction.

(e) Using an oscilloscope, check the signal waveform of the ECM.





Waveform 1 (Reference):





HINT
As the engine revolution speed increases, the wavelength shortens.

4. CHECK STEERING LOCK ECU





(a) Disconnect the E51 ECU connector.

(b) Measure the voltage and resistance of the wire harness side connector.





* If the result is not as specified, there may be a malfunction on the wire harness side.

(c) Reconnect the E51 ECU connector.

(d) Measure the voltage of the connector.





* If the result is not as specified, the ECU may have a malfunction.