Diagnostic Procedure 15 — Engine Stalls when Accelerating or when Driving at Constant Speed (Cont'd)
EF & EC-552flowchartSR20DET engine (per page header tab).
TROUBLE DIAGNOSES
Diagnostic Procedure 15 — Engine Stalls when Accelerating or when Driving at Constant Speed (Cont'd)
1
CHECK FUEL PRESSURE. 1. Release fuel pressure to zero. (Refer to page EF & EC-638.) 2. Install fuel pressure gauge and check fuel pressure. At idle: Approx. 245 kPa (2.45 bar, 2.5 kg/cm2, 36 psi). A few seconds after ignition switch is turned from OFF to ON: Approx. 294 kPa (2.94 bar, 3.0 kg/cm2, 43 psi).
N.G.
Check fuel pump, circuit and fuel pressure regulator.
O.K.
2
CHECK FOR INTAKE AIR LEAK. When pinching blow-by hose (lowering the blow-by air supply), does the engine speed rise?
Yes
Discover air leak location and repair.
No
3
CHECK E.C.U. HARNESS CONNECTOR. Check the E.C.U. pin terminals for damage or poor connection of E.C.U. harness connector.
N.G.
Repair or replace.
O.K.
4
CHECK E.C.U. POWER SUPPLY AND GROUND CIRCUIT. Refer to page EF & EC-560.
Yes
same as step 3
No
5
TRY A KNOWN GOOD E.C.U.*
Trouble is not fixed.
INSPECTION END
Trouble is fixed.
6
Replace E.C.U.
NOTE
*: E.C.U. may be the cause of a problem, but this is rarely the case.