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BASIC SERVICE PROCEDURE EC-45 C D E F G H I J K L M A EC 31. REPLACE HEATED OXYGEN SENSOR 1 1. Stop engine. 2. Replace heated oxygen sensor 1 on the malfunctioning bank. With CONSULT-II>>GO TO 32. 32. CHECK HEATED OXYGEN SENSOR 1 (BANK 1) / (BANK 2) SIGNAL With CONSULT-II 1. Start engine and warm it up until engine coolant temperature indicator points the middle of gauge. 2. See “HO2S1 MNTR (B1)/(B2)” in “DATA MONITOR” mode. 3. Running engine at 2,000 rpm under no load (The engine is warmed up to normal operating temperature.), OK or NG OK >> GO TO 4. NG >> GO TO 34. 33. CHECK HEATED OXYGEN SENSOR 1 (BANK 1) / (BANK 2) SIGNAL Without CONSULT-II 1. Set ECM to Self Diagnostic Test Mode II (Heated oxygen sensor 1 monitor). Refer to 2. Switch the monitored sensor to the malfunctioning bank. Refer to EC-67, "How to Switch Monitored Sen- sor From Bank 1 to Bank 2 or Vice Versa" . 3. Running engine at 2,000 rpm under no load (The engine is warmed up to normal operating temperature.), OK or NG OK >> GO TO 4. NG >> GO TO 34. 34. DETECT MALFUNCTIONING PART Check the following. ● Check fuel pressure regulator and repair or replace if necessary. Refer to ● Check mass air flow sensor and its circuit, and repair or replace if necessary. Refer to . ● Check injector and its circuit, and repair or replace if necessary. Refer to ● Check engine coolant temperature sensor and its circuit, and repair or replace if necessary. Refer to and OK or NG OK >> GO TO 36. NG >> 1. Repair or replace. 2. GO TO 35. 1 time: RICH → LEAN → RICH 2 times: RICH → LEAN → RICH → LEAN → RICH PBIB0120E |