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TROUBLESHOOTING MULTIPORT FUEL INJECTION (MPI) <4A9> 13A-78 STEP 5. Check harness between B-53 (terminal • Check earthing line for open circuit and damage. Q: Is the check result normal? YES : Go to Step 6 . NO : Repair the damaged harness wire. STEP 6. M.U.T.-III data list • Refer to Data List Reference Table . a. Item 59: Oxygen sensor (rear) Q: Is the check result normal? YES : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/Inspection Service Points − How to Cope with Intermittent Malfunctions ). NO : Replace the engine-ECU <M/T> or STEP 7. Perform voltage measurement at B-53 • Use special tool test harness (MB991658) to con- nect connector, and measure at pick-up harness. • Engine: After warm-up • Transmission: Neutral • Voltage between terminal No. 1 and earth. OK: When the engine is 2,500 r/min, the output voltage should repeat 0 to 0.8 V alternately Q: Is the check result normal? YES : Go to Step 10 . NO : Go to Step 8 . STEP 8. Check Oxygen sensor (rear) itself. • Check oxygen sensor (rear) itself (Refer to ). Q: Is the check result normal? YES : Go to Step 9 . NO : Replace the oxygen sensor (rear). AK402019 3 2 1 4 Oxygen sensor (rear) Connector: B-53 B-53 Harness side connector AC B-53 AK402725 77 78 79 80 81 82 83 84 92 93 94 95 96 97 98 99 85 86 87 88 89 90 91 100 101 102 103 104 105 106 115 116 117 118 119 120 121 107 108 109 110 111 112 113 114 130 131 132 133 134 135 136 122 123 124 125 126 127 128 129 72 71 74 73 76 75 R AG A-08 Connector: A-08 Harness side connector Battery Engine-ECU <M/T> or AK402019 3 2 1 4 Oxygen sensor (rear) Connector: B-53 B-53 Harness side connector AC B-53 Main Index Group TOC |