Diagnostic Procedure 19 — Surging (Cont'd)
EF & EC-121flowchartTROUBLE DIAGNOSES
Diagnostic Procedure 19 — Surging (Cont'd)
1
D (continued from previous page)
2
Check compression pressure and ignition timing.
3
9. Check fuel pressure. With CONSULT: • Start engine. • With "WORK SUPPORT" showing on display, eliminate fuel pressure using "Fuel Pressure Removal". • After stalling engine, crank engine two or three times. • Install fuel pressure gauge and check fuel pressure. Fuel pressure during idle: Approx. 245 kPa (2.45 bar, 2.5 kg/cm², 36 psi). Fuel pressure (when pressure regulator vacuum hose is removed): Approx. 294 kPa (2.94 bar, 3.0 kg/cm², 43 psi). Without CONSULT: • Start engine. • Remove fuel pump fuse to eliminate fuel pressure. • After stalling engine, crank engine two or three times. • Install fuel pressure gauge and check fuel pressure. Fuel pressure during idle: Approx. 245 kPa (2.45 bar, 2.5 kg/cm², 36 psi). Fuel pressure (when pressure regulator vacuum hose is removed): Approx. 294 kPa (2.94 bar, 3.0 kg/cm², 43 psi).
N.G.
Check fuel pressure regulator diaphragm.
O.K.
4
Check E.C.U. harness connector. • Check E.C.U. pin terminals and harness connector for poor contact or damage.
N.G.
Repair or replace.
O.K.
5
Check E.C.U. power supply and ground circuit. Refer to "Main Power Supply and Ground Circuit". (See page EF&EC-128)
N.G.
same as step 4
O.K.
6
Replace E.C.U.
END