October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Poor Idling: Surging

Check switch condition signal circuit. See CODE 51 in appropriate articles;

For GS300 TESTS W/CODES

For SC300 TESTS W/CODES

For SC400 TESTS W/CODES

Check Idle Air Control (IAC) valve circuit.
Check Volume Airflow (VAF) sensor circuit. See CODE 31 in appropriate articles;

For GS300 TESTS W/CODES

For SC300 TESTS W/CODES

For SC400 TESTS W/CODES

Check ECM power source circuit (ignition keyed).
Check fuel pump control circuit. See CODE 78 in appropriate articles;

For GS300 TESTS W/CODES

For SC300 TESTS W/CODES

For SC400 TESTS W/CODES