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TROUBLESHOOTING MULTIPORT FUEL INJECTION (MFI) 13A-75 STEP 8. Connector check: C-137 engine-ECU Q: Is the check result normal? YES : Check and repair harness between C-18 (terminal No. 3) oxygen sensor connector Check earthing line for damage. NO : Repair. STEP 9. Measure voltage at C-18 oxygen sensor Use special tool test harness (MB991658) to con- Engine: After warm-up Voltage between terminal No. 4 and earth. OK: 600 - 1,000 mV when 200 mV or lower abrupt racing is done a few seconds after abrupt Q: Is the check result normal? YES : Go to Step 12 . NO : Go to Step 10 . STEP 10. Check oxygen sensor (rear) itself. Check oxygen sensor (rear) itself (Refer to Q: Is the check result normal? YES : Go to Step 11 . NO : Replace oxygen (rear) sensor. AK300254 82 78 8180 89 90 91 92 79 87 71 74 73 72 76 75 77 85 88 83 84 86 AB CONNECTOR: C-137 C-137 Harness side connector AK300270 1 2 3 4 AB Connector: C-18 Oxygen sensor (rear) C-18 Harness side AK300270 1 2 3 4 AB Connector: C-18 Oxygen sensor (rear) C-18 Harness side |