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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-1164 INJECTOR Required Special Tools: • MB991658: Test Harness • MB991923: Power Plant ECU Check Harness . Measurement Method <Measure at the right bank (number 1, 3, 5 cylinders)> 1. Disconnect the intermediate connector B-32, and connect the test harness special tool (MB991658) between the 2. Connect the oscilloscope probe to each intermediate connector B-32 terminal to analyze each cylinder: • Terminal No. 5 for the number 1 cylinder • Terminal No. 10 for the number 3 cylinder • Terminal No. 4 for the number 5 cylinder <Measure at the right bank (number 2, 4, 6 cylinders)> 1. Disconnect the injector connector, and connect the test har- ness special tool (MB991658) between the separated con- 2. Connect the oscilloscope probe to injector connector termi- nal No. 2. Alternate method (Measure at the PCM) 1. Disconnect the all PCM connectors, and connect check har- ness special tool (MB991923) between the separated con- 1 2 3 6 7 8 4 5 9 10 AK203300 OSCILLOSCOPE MB991658 B-32 INTERMEDIATE AB AK302166 1 2 INJECTOR MB991658 OSCILLOSCOPE AB AK202954 127 126 125 124 123 122 121 133 132 131 130 129 128 140 139 138 137 136 135 134 146 145 144 143 142 141 153 152 151 150 149 148 147 AB POWER PLANT ECU MB991923 PCM |