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52 - Power steering pressure switch always open or closed.. Either fluid is low or the switch is faulty.
84 - EGR Vacuum Solenoid circuit failure.. Check the EGR vacuum circuit, broken vacuum lines are common on these old trucks. If vacuum is OK the EGR solenoid may be bad.
15(CM) - EEC battery powered Keep Alive Memory (KAM) test failed... The computer is loosing battery power, check and/or replace ground wires on the computer harness and in the engine bay. May be a good idea to pull the computer and check the connector for corroded pins.
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