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Home › Cadillac › 1990 › Eldorado 440T4/ME9 › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes › ECM Trouble Code Charts › ECM Code EO40: Open PSPS Circuit › Failure Conditions:

Failure Conditions:

Power steering switch opens (ECM sees zero volts on terminal C9, steering input).

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