B2275

2AR-FE STARTING: SMART KEY SYSTEM: B2275: STSW Monitor Malfunction
B2275 - STSW Monitor Malfunction

DESCRIPTION

This DTC is output when there is an open, short, or any other problem in the engine start request output circuit inside the main body ECU or in the external circuit.

HINT
When the main body ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

After the main body ECU is replaced, perform the registration procedures for the engine immobiliser system Engine Immobiliser System (W/ Smart Key System).





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT

(a) Delete the DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
After all DTCs are cleared, turn the engine switch on (IG) and depress the brake pedal. After 15 seconds have elapsed, check if the trouble occurs again.

(b) Check for DTCs again.

OK:

No DTC is output.

NG -- CHECK WIRE HARNESS (MAIN BODY ECU - ECM)

OK -- CHECK INTERMITTENT PROBLEMS

2. CHECK WIRE HARNESS (MAIN BODY ECU - ECM)

(a) Disconnect the E9 ECU connector.





(b) Disconnect the A24 ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT MAIN BODY ECU

(a) Reconnect the connectors.





(b) Measure the voltage according to the value(s) in the table below.

Standard voltage:





NG -- REPLACE MAIN BODY ECU
OK -- Continue to next step.

4. CHECK MAIN BODY ECU OPERATION

(a) After replacing the main body ECU with a normally functioning ECU, check that the engine can start.

OK:

Engine can start normally.

NG -- GO TO ENGINE CONTROL SYSTEM

OK -- END (MAIN BODY ECU DEFECTIVE)