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ON-VEHICLE SERVICE MULTIPORT FUEL INJECTION (MPI) 13A-391 OXYGEN SENSOR CHECK M1131005000947 OXYGEN SENSOR (FRONT) 1. Disconnect the oxygen sensor connector and connect the special tool Test harness (MB991316) 2. Make sure that there is continuity (4.5 − 8.0 Ω at 20 °C) between terminal No. 1 (red clip of special tool) and No. 3 (blue clip of special tool) on the 3. If there is no continuity, replace the oxygen sensor. 4. Warm up the engine until engine coolant is 80 °C or higher. 5. Perform a tracing for 5 minutes or more with the engine speed of 4,500 r/min. 6. Connect a digital voltage meter between terminal No. 2 (black clip of special tool) and No. 4 (white 7. While repeatedly racing the engine, measure the oxygen sensor output voltage. Standard value: CAUTION • Be very careful when connecting the jumper wire; incorrect connection can damage the • Be careful the heater is broken when voltage of beyond 8V is applied to the oxygen sensor NOTE: If the sufficiently high temperature (of ° C or more) is not reached although the oxygen sensor is normal, the output 8. If the sensor is defective, replace the oxygen sensor. AK300694 1 2 3 4 AC Equipment side Cylinder 1, 4 Cylinder 1, 4 AK300703 1 2 3 4 AC Equipment side Cylinder 2, 3 Cylinder 2, 3 AKX01624 Red Blue MB991316 Oxygen AR Engine Oxygen Remarks When 0.6 − 1.0 V If you make the air-fuel ratio rich by racing the − 1.0 V. AKX01624 Black White MB991316 Oxygen AP |