B2275

2GR-FE STARTING: SMART ACCESS SYSTEM WITH PUSH-BUTTON START: 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 Immobilizer 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 E58 ECU connector.





(b) Disconnect the A10 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. Make sure the brake pedal is depressed and the shift position is P at this time.

(b) Check that the engine switch mode can be changed by pushing the engine switch.

HINT
Without depressing the brake pedal, push the engine switch repeatedly. Engine switch mode should turn from off to on (ACC) to on (IG) and back to off. With the brake pedal depressed, push the engine switch repeatedly. Engine switch mode should turn to ENGINE START from any status.

OK:

Engine can start normally.

HINT
If engine does not start, Engine Does Not Start.

NG -- GO TO OTHER PROBLEM

OK -- END (MAIN BODY ECU DEFECTIVE)