Merc manual v5 - Pirate4x4.Com
Merc manual v5 - Pirate4x4.Com
Merc manual v5 - Pirate4x4.Com
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GM Marine EFI<br />
GM EFI TROUBLE CODE CHART<br />
MEFI-3 & MEFI-4<br />
Code<br />
Description<br />
13 Oxygen Sensor 1 or 2 Malfunction<br />
14 Coolant Sensor Voltage High (cold)<br />
15 Coolant Sensor Voltage Low(hot)<br />
21 Throttle Position Sensor Voltage High<br />
21 Throttle Position Sensor Voltage Skewed High<br />
22 Throttle Position Sensor Voltage Low<br />
23 Manifold Air Temperature Sensor High (cold)<br />
24 Speed Sensor Inactive (if installed)<br />
25 Manifold Air Temperature Sensor Low (hot)<br />
31 Governor Not Tracking<br />
32 EGR Valve Not Tracking<br />
33 Manifold Absolute Pressure Sensor High<br />
34 Manifold Absolute Pressure Sensor Low<br />
41 Electronic Spark Timing Open Circuit<br />
42 Electronic Spark Timing Grounded Circuit<br />
43 Electronic Spark Control Detects Continuous Knock<br />
44 Knock Sensor 1 or 2 Inactive<br />
51 Calibration Checksum Error<br />
54 Oxygen Sensor 1 or 2 Lean<br />
55 Oxygen Sensor 1 or 2 Rich<br />
61 Fuel Pressure Sensor High<br />
62 Fuel Pressure Sensor Low<br />
63 Fuel Temperature High<br />
64 Fuel Temperature Low<br />
81 See Scan Tool*<br />
* Scan tool will display specific details on the type of Code 81 that is<br />
set. Code 81 is associated with a variety of system faults.<br />
Page 18
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