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GENERAL SYSTEM DIAGNOSTICS

SERVICE MANUAL NUMBER 23

90-861326--1 MARCH 1999 Page 5E-5

Diagnostic Trouble Codes

MEFI 1 - Codes for the 454 / 502 Mag MPI and 8.2L MPI Engines

Code Number Code Description

Code 14 (ECT) Engine Coolant Temperature

Code 21 (TP) Throttle Position Sensor

Code 23 (IAT) Intake Air Temperature

Code 33 (MAP) Manifold Absolute Pressure

Code 42 (IC) Ignition Control

Code 43 (KS) Knock Sensor

Code 51 Calibration Memory Failure

MEFI 2 - Codes for the 7.4L MPI Engines

Code Number Code Description

Code 14 (ECT) Engine Coolant Temperature - Low Temperature Indicated

Code 15 (ECT) Engine Coolant Temperature - High Temperature Indicated

Code 21 (TP) Throttle Position Sensor - Signal Voltage High

Code 22 (TP) Throttle Position Sensor - Signal Voltage Low

Code 23 (IAT) Intake Air Temperature - Low Temperature Indicated

Code 25 (IAT) Intake Air Temperature - High Temperature Indicated

Code 33 (MAP) Manifold Absolute Pressure - Signal Voltage High

Code34 (MAP) Manifold Absolute Pressure - Signal Voltage Low

Code 41 (IC) Ignition Control - Open IC Circuit

Code 42 (IC) Ignition Control - Grounded IC Circuit, Open or Grounded Bypass

Code 43 (KS) Knock Sensor - Continuous Knock Detected

Code 44 (KS) Knock Sensor - No Knock Detected

Code 51 (ECM) Calibration Memory Failure

Code 52 (ECM) EEPROM Failure

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Index

Mercury MerCruiser MIE 8.2L MPI User Manual

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