Diagnostic Procedure 7 — Hesitation when the Engine is Hot (Cont'd)
EF & EC-77flowchartUnverifiedTROUBLE DIAGNOSES
Diagnostic Procedure 7 — Hesitation when the Engine is Hot (Cont'd)
1
From point A (continued from previous page)
2
Check ignition system. Check for operation. Refer to "Ignition Signal". (See page EF&EC-140).
N.G.
Repair or replace.
O.K.
3
Check spark plugs. Stop engine. Remove spark plugs and check for contaminants or damage. Also check spark gaps.
N.G.
same as step 2
O.K.
4
Check exhaust gas sensor. [With CONSULT] Run engine at approximately 2,000 rpm after warm-up. Conduct "MIXTURE RATIO" test with "FUNCTION TEST" showing on display or proceed as follows: Select "EXH GAS SEN" with "DATA MONITOR" showing on display. Run engine at 2,000 rpm under no load after warm-up. Check to ensure display alternately shows "LEAN" and "RICH" at least 5 times within 10 seconds. RICH→LEAN→RICH→LEAN→ RICH... (← 1 time → ← 2 times →). [Without CONSULT] Set body-side diagnostic connector (inside fuse box) in "Exhaust gas sensor monitor" mode. (Refer to "Self-Diagnosis".) Run engine at 2,000 rpm under no load after warm-up. Check to ensure RED L.E.C. on E.C.U. flashes at least 5 times within 10 seconds.
N.G.
Replace exhaust gas sensor.
O.K.
5
Check fuel pressure. (Refer to "Fuel Pressure Check" in "FUEL INJECTION CONTROL SYSTEM INSPECTION".)
N.G.
Check fuel pump and circuit. Refer to "Fuel Pump". (See page EF&EC-155). Check pressure regulator and fuel hose.
O.K.
END