Diagnostic Procedure 24 (Cont'd) - Air Flow Meter
EF & EC-473flowchartApplies to SR20DE. CONSULT DATA MONITOR or manual continuity check are alternatives for input signal circuit.
Air Flow Meter (Code No. 12) Inspection
1
INSPECTION START
2
CHECK POWER SUPPLY. 1) Disconnect air flow meter harness connector. 2) Turn ignition switch "ON". 3) Check voltage between terminal (b) and ground. Voltage: Battery voltage
N.G.
Check the following. - Harness continuity between air flow meter and E.C.C.S. relay. If N.G., repair harness or connectors.
O.K.
3
CHECK GROUND CIRCUIT. 1) Turn ignition switch "OFF". 2) Disconnect E.C.U. harness connector. 3) Check harness continuity between terminal (a) and E.C.U. terminal 17. Continuity should exist.
N.G.
Repair harness or connectors.
O.K.
4
CHECK INPUT SIGNAL CIRCUIT. 1) Reconnect air flow meter harness connector and E.C.U. harness connector. 2) Start engine and warm it up sufficiently. 3) Read air flow meter signal in "DATA MONITOR" mode with CONSULT. Voltage: 1.3 - 1.8V (At idle) OR 1) Check harness continuity between terminal (a) and E.C.U. terminal 16. Continuity should exist.
N.G.
same as step 3
O.K.
5
CHECK COMPONENT (Air flow meter). Refer to "Electrical Components Inspection". (See page EF & EC-629.)
N.G.
Replace air flow meter.
O.K.
Check E.C.U. pin terminals for damage or the connection of E.C.U. harness connector.