TROUBLE DIAGNOSES - Diagnostic Procedure 3 (Cont'd)
EF & EC-85flowchartDiagnostic Procedure 3 (Cont'd)
1
INSPECTION START
2
Perform self-diagnosis (Mode III). Is Code No. 12 indicated?
No
INSPECTION END
Yes
3
CHECK POWER SOURCE. 1) Disconnect air flow meter harness connector. 2) Turn ignition switch "ON". 3) Check voltage between terminal (b) and ground. Battery voltage should exist.
N.G.
Repair harness or connectors.
O.K.
4
CHECK INPUT SIGNAL. 1) Reconnect air flow meter harness connector. 2) Start engine and warm it up sufficiently. 3) Make sure that voltage exists between E.C.U. terminal (27) and ground. Voltage: Approximately 1.5V (at idle)
O.K.
same as step 2
N.G.
5
CHECK CONTINUITY BETWEEN E.C.U. AND AIR FLOW METER. 1) Turn ignition switch "OFF". 2) Disconnect E.C.U. harness connector. 3) Disconnect air flow meter harness connector. 4) Check continuity between terminals (a) and (37), (c) and (26), and (d) and (27). Resistance: Approximately 0Ω
O.K.
6
CHECK COMPONENT (Air flow meter). Refer to "Electrical Components Inspection". (See page EF & EC-124.)
| Specification | Value |
|---|---|
| Battery voltage at terminal (b) and groundIgnition switch ON, air flow meter harness connector disconnected | Battery voltageV |
| Voltage between E.C.U. terminal (27) and groundAt idle, engine warmed up | Approximately 1.5V |
| Continuity resistance between terminals (a) and (37), (c) and (26), (d) and (27)Ignition switch OFF, E.C.U. and air flow meter harness connectors disconnected | Approximately 0Ω |
Battery voltage at terminal (b) and groundIgnition switch ON, air flow meter harness connector disconnected
Battery voltageV
Voltage between E.C.U. terminal (27) and groundAt idle, engine warmed up
Approximately 1.5V
Continuity resistance between terminals (a) and (37), (c) and (26), (d) and (27)Ignition switch OFF, E.C.U. and air flow meter harness connectors disconnected
Approximately 0Ω