CONTINUED FROM PAGE FI-73 ① ② ③ ④ Repair the relevent diagnostic code Malfunction code(s) (ex. code 21) Read and record diagnostic codes (See page FI-22) Normal code and code 21 Unshort terminals T and E₁ of the service connector. And maintain engine at 2,500 rpm. Measure voltage between terminals V_F and E₁. 0V 5V Disconnect the PCV hose. Measure voltage between terminals D_F and E₁ 0V More than 0V Repair (Over rich) Disconnect the water temp. sensor connector and connect resistor with a resitace of 4 — 8 KΩ or another coded water temp. sensor. Short terminals T and E₁ of the service connector. Warm up the oxygen sensor with the engine at 2,500 rpm for approx. 90 seconds. And maintain engine speed at 2,500 rpm. Measure voltage between terminals V_F and E₁. 0V 5V Replace the oxygen sensor Repair (Over lean)