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ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (FS)] 01–02B–68 7 VERIFY CURRENT INPUT SIGNAL STATUS OF • Access O2S11 PID using WDS or equivalent. • Check PID under following accelerator pedal depressing accelerator pedal (rich — Less than 0.45 V just after release of accelerator pedal (lean condition) • Is PID reading okay? Yes Inspect following for air suction due to cracks, damages and loose parts: • From air cleaner to throttle body • From throttle body to dynamic chamber • From dynamic chamber to intake manifold • Vacuum hoses Note • Engine speed may change when rust penetrating Repair or replace any faulty part, then go to Step 20. No Visually inspect for any gas leakage between exhaust • If there is no leakage, replace HO2S (front). Then go to Step 20. 8 INSPECT MAF SIGNAL • Start engine. • Access MAF PID using WDS or equivalent. • Verify that MAF PID changes quickly according • Is MAF PID response okay? Yes Go to next step. No Replace MAF sensor, then go to Step 20. 9 INSPECT FOR EXCESSIVE AIR SUCTION OF • Visually inspect for loose, cracked or damaged • Is there malfunction? Yes Repair or replace source of air suction, then go to Step 20. No Go to next step. 10 INSPECT FUEL LINE PRESSURE • Turn ignition key to OFF. Note • If engine will not start, inspect fuel line • Inspect fuel line pressure while engine running. • Is fuel line pressure within 210—250 kPa 2 , 30—36 psi}? Yes Go to Step 14. No If fuel line pressure is too high: Go to next step. 11 VERIFY VACUUM IS LEADING TO PRESSURE • Disconnect vacuum hose from pressure • Verify that vacuum is felt at opening port of • Is vacuum felt? Yes Inspect fuel pump maximum pressure and fuel return hose for clogging. • If any problem is found, repair or replace suspected • If all items above are okay, replace pressure regulator. Then go to Step 20. No Verify vacuum hoses are connected correctly. • If okay, replace PRC solenoid valve, then go to Step 20. • If not, reconnect vacuum hoses to correct position, then 12 INSPECT FUEL PUMP MAXIMUM PRESSURE • Perform fuel pump maximum pressure test. • Is fuel pump maximum pressure within 450— 2 , 64—92 psi}? Yes Go to next step. No Inspect fuel pump circuit for open or poor connection. • If circuit is okay, replace fuel pump. Then go to Step 20. STEP INSPECTION ACTION 1712-1U-01G(01-02B).fm 68 ページ 2001年6月29日 金曜日 午後3時24分 |