Operation CHARM
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1994
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Mustang V6-232 3.8L
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Repair and Diagnosis
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Powertrain Management
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Testing and Inspection
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Pinpoint Tests
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Z - Intermittent
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Z105
Z105
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Key Off.
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Measure the resistance from IDM jack to Pin 4 of PCM breakout box.
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Is resistance less than 5 ohms?
Yes --
REPLACE PCM.
No --
SERVICE open circuit in harness between ICM and PCM.