P.13A-6 - LIL EVO

13A-46MULTIPORT FUEL INJECTION (MFI)MULTIPORT FUEL INJECTION (MFI) DIAGNOSISCONNECTOR: B-12XCONNECTOR: C-115, C-119, C-121MFI RELAYECMAK203489ABC-115(Y)C-119(Y)C-121(Y)AK203487ACCONNECTOR: B-105VOLUME AIRFLOW SENSORB-105 (B)AK203495AB.CIRCUIT OPERATION• The volume airflow sensor power is supplied fromthe MFI relay (terminal No. 4), and the ground isprovided on the ECM (terminal No. 40).• 5-volt power is applied to the volume airflow sensoroutput terminal (terminal No. 3) from the ECM(terminal No. 90). The volume airflow sensor generatesa pulse signal when the output terminaland ground are opened/closed (opened/short)..TECHNICAL DESCRIPTION• While the engine is running, the volume airflowsensor outputs a pulse signal which correspondsto the volume of airflow.• The ECM checks whether the frequency of thissignal output by the volume airflow sensor whilethe engine is running is at or above the set value.DIAGNOSIS.DTC SET CONDITIONSCheck Conditions• Engine speed is higher than 500 r/min.Judgement Criteria• Volume airflow sensor output frequency has continuedto be 3.3 Hz or lower for 2 seconds..TROUBLESHOOTING HINTS (The most likelycauses for this code to be set are:)• Volume airflow sensor failed.• Open or shorted volume airflow sensor circuit,harness damage or connector damage.• ECM failed.Required Special Tools:• MB991502: Scan Tool (MUT-II)• MB991958: Scan Tool (MUT-III Sub Assembly)• MB991824: V.C.I.• MB991827: USB Cable• MB991911: Main Harness BTSB Revision