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8. CHECK THE MAF SENSOR OUTPUT SIGNAL CIRCUIT FOR AN OPEN OR SHORT • Check harness continuity between MAF sensor terminal 5 and ECM terminal 37. • Continuity should exist. • Check harness for a short to ground. Is the check result normal? Yes >> Go to the next step. No >> Repair or replace the circuit for an open or short to ground in harness or connectors. 9. CHECK THE MAF SENSOR • Install all removed parts. • Start engine. • Check MAF sensor signal in data stream with the X-431. TERMINAL NO. ITEM CONDITION DATA (AVERAGE DC VOLTAGE) 37 Air flow sensor • Engine is running • ECT: 78°C • Idle: 795 RPM • IAT: 36°C • IAT signal: 1.88 V Approximately 322 kg/h Approximately 1.39 V • If without the X-431, check voltage between MAF sensor terminal 5 and ground. TERMINAL NO. ITEM CONDITION DATA (AVERAGE DC VOLTAGE) 37 Air flow sensor • Engine is running • ECT: 78°C • Idle: 795 RPM • IAT: 36°C • IAT signal: 1.88 V Approximately 1.39 V DIAGNOSIS & TESTING 03
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