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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-317 STEP 14. Check the left bank heated oxygen sensor (front). (1) Disconnect the left bank heated oxygen sensor (front) connector B-25 and connect test harness special tool, (2) Warm up the engine until engine coolant temperature reaches 80 °C (176°F) or higher. (3) Perform a tracing for 5 minutes or more with the engine speed of 4,500 r/min. (4) Connect a digital voltage meter between terminal No. 2 (black clip) and terminal No. 4 (white clip). (5) While repeatedly revving the engine, measure the right bank heated oxygen sensor (front) output voltage. Standard value: 0.6 − 1.0 volt CAUTION • Be very careful when connecting the jumper wire; incorrect connection can damage the oxygen sensor. • Be careful the heater is broken when voltage of beyond 8V is applied to the oxygen sensor heater. ° C or more) is not reached although the oxygen sensor is normal, the output voltage would be possibly low Q: Is the voltage between 0.6 and 1.0 volt? YES : Replace the PCM. Then go to Step 15. Then go to Step 15. AK303071 1 2 3 4 LEFT BANK CONNECTOR: B-25 B-25 (B) AB HARNESS AKX01624 HEATED MD998464 WHITE BLACK AQ |