TROUBLE DIAGNOSES — Diagnostic Procedure 24 (Cont'd)
EF & EC-135flowchartHarness connector check differs by drive side: L.H.D. models use connectors (M59),(E55); R.H.D. models use (M3),(E1).
Diagnostic Procedure 24 (Cont'd)
Diagnostic Procedure 24 (air flow meter)
1
INSPECTION START
2
A — CHECK POWER SUPPLY. 1) Disconnect air flow meter harness connector. 2) Turn ignition switch "ON". 3) Check voltage between terminal (c) and ground. Voltage: Battery voltage
N.G.
Check the following. • Harness connectors (F21), (M17) • Harness connectors (M59), (E55) (L.H.D. models) • Harness connectors (M3), (E1) (R.H.D. models) • Harness continuity between air flow meter and E.C.C.S. relay. If N.G., repair harness or connectors.
Check the following. • Harness connectors (F21), (M17) • Harness connectors (M59), (E55) (L.H.D. models) • Harness connectors (M3), (E1) (R.H.D. models) • Harness continuity between air flow meter and E.C.C.S. relay. If N.G., repair harness or connectors.
O.K.
3
B — CHECK GROUND CIRCUIT. 1) Turn ignition switch "OFF". 2) Check harness continuity between terminal (b) and engine ground. Continuity should exist.
N.G.
Repair harness or connectors.
O.K.
4
C — CHECK INPUT SIGNAL CIRCUIT. 1) Reconnect air flow meter harness connector. 2) Start engine and warm it up sufficiently. 3) Read air flow meter signal in "DATA MONITOR" mode with CONSULT. Voltage: 1.0 - 1.3V (At idle) — OR — 1) Disconnect E.C.U. harness connector. 2) Check harness continuity between air flow meter 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 171 - 180)
N.G.
Replace air flow meter.
O.K.
Check E.C.U. pin terminals for damage or poor connection of E.C.U. harness connector.
See also
EF & EC 171 - 180