Diagnostic Trouble Codes; Mefi 1 - Codes For The 454 / 502 Mag Mpi And 8.2L Mpi Engines; Mefi 2 - Codes For The 7.4L Mpi Engines - Mercury MerCruiser MCM 454 Mag MPI Service Manual

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SERVICE MANUAL NUMBER 23

Diagnostic Trouble Codes

90-861326--1 MARCH 1999

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(ECT) Engine Coolant Temperature

(TP) Throttle Position Sensor

(IAT) Intake Air Temperature

(MAP) Manifold Absolute Pressure

(IC) Ignition Control

(KS) Knock Sensor

Calibration Memory Failure

(ECT) Engine Coolant Temperature - Low Temperature Indicated

(ECT) Engine Coolant Temperature - High Temperature Indicated

(TP) Throttle Position Sensor - Signal Voltage High

(TP) Throttle Position Sensor - Signal Voltage Low

(IAT) Intake Air Temperature - Low Temperature Indicated

(IAT) Intake Air Temperature - High Temperature Indicated

(MAP) Manifold Absolute Pressure - Signal Voltage High

(MAP) Manifold Absolute Pressure - Signal Voltage Low

(IC) Ignition Control - Open IC Circuit

(IC) Ignition Control - Grounded IC Circuit, Open or Grounded Bypass

(KS) Knock Sensor - Continuous Knock Detected

(KS) Knock Sensor - No Knock Detected

(ECM) Calibration Memory Failure

(ECM) EEPROM Failure

GENERAL SYSTEM DIAGNOSTICS

Code Description

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