15755T Mercruiser MANDREL

Table 1
FMI Description
15 Parameter High - Least Severe (1)
16 Parameter High - Moderate Severity (2)
0 Parameter High - Most Severe (3)
17 Parameter Low - Least Severe (1)
18 Parameter Low - Moderate Severity (2)
1 Parameter Low - Most Severe (3) The Electronic Control Module (ECM) can log events. Logged events usually indicate a mechanical fault instead of an electronic system fault or the engine is operating outside the design specification.Note: If a diagnostic code has already been logged, any associated event code to that fault will not be logged.Note: If an event code is already active, a diagnostic code that is associated with the same sensor will not be active.Active Event Codes
An active event code represents a fault with engine operation. Correct the fault as soon as possible.Active event codes are listed in ascending numerical order. The code with the lowest number is listed first.Event codes will cause the warning lamp to illuminate and the event will be logged.Illustration 1 is an example of the operating range of an oil temperature sensor. Do not use the Illustration to troubleshoot the oil temperature sensor.
Illustration 1 g01365757
Example of the typical operating range of a sensor
(1) This area represents the normal operating range of the engine parameter.
(2) In these areas, the engine is operating in an unsafe operating range of the monitored parameter. An event code will be generated for the monitored parameter. The sensor circuit does not have an electronic fault.
(3) In these areas, the signal from the sensor is outside of the operating range of the sensor. The sensor circuit has an electronic fault. A diagnostic code will be generated for the sensor circuit. Refer to Troubleshooting, "Self Diagnostics" for additional information on diagnostic codes. The following format is used for event codes:"XXXX-YY Description of the event"The "XXXX" represents a System Parameter Number for the event code. The "-YY" represents FMI for the severity of the event. The FMI is followed by a description of the event. Refer to the following example:"100-17 Engine Oil Pressure : Low - Least Severe (1)"In this example, the number "-17" indicates the severity of the event. The ECM has three levels of response to events:Level (1) - This level can be referred to as the "Warning Level". This condition represents a serious problem with engine operation. However, this condition does not require the engine to derate or shut down. The warning lamp will come on.Level (2) - This level can be referred to as the "Derate Level". For this condition, the ECM will derate the engine in order to help prevent possible engine damage. The warning lamp will flash.Level (3) - This level can be referred to as the "Shutdown Level". A "Level 3" event code will be logged in the ECM and the engine will shut down if the shutdown feature is enabled. The warning lamp will flash and the shutdown lamp will come on.Responses to certain events may be programmed into the ECM. Refer to Troubleshooting, "System Configuration Parameters".Logged Event Codes
When the ECM generates an event code, the ECM logs the code in permanent memory. The ECM has an internal diagnostic clock. The ECM will record the following information when an event code is generated:
The hour of the first occurrence of the code
The hour of the last occurrence of the code
The number of occurrences of the codeLogged events are listed in chronological order. The most recent event code is listed first.This information can be helpful for troubleshooting intermittent faults. Logged codes can also be used to review the performance of the engine.Clearing Event Codes
A code is cleared from memory when one of the following conditions occur:
The code does not recur for 100 hours.
A new code is logged and there are already ten codes in memory. In this case, the oldest code is cleared.
The service technician manually clears the code.Always clear logged event codes after investigating and correcting the fault which generated the code.Troubleshooting
For basic troubleshooting of the engine, perform the following steps in order to diagnose a malfunction:
Obtain the following information about the complaint from the operator:
The event and the time of the event
Determine the conditions for the event. The conditions will include the engine rpm and the load.
Determine if there are any systems that were installed by the dealer or by the customer that could cause the event.
Determine whether any additional events occurred.
Verify that the complaint is not due to normal engine operation. Verify that the complaint is not due to error of the operator.
Refer to Troubleshooting, "Diagnostic Trouble Codes". Perform the troubleshooting procedure that is shown against the reported code. If these steps do not resolve the fault, identify the procedures in this manual that best describe the event. Check each probable cause according to the tests that are recommended.