14187M Mariner FUEL CONNECTOR

Check Engine/Diagnostic Lamp
The CHECK ENGINE/DIAGNOSTIC lamp (amber color), on the truck dashboard, can be used as a diagnostic lamp to communicate status or operation problems of the electronic control system. When the System detects a problem, a Diagnostic Code is generated which activates the CHECK ENGINE/DIAGNOSTIC lamp. In most cases the code will be stored in permanent memory in the ECM. Diagnostic Codes that represent current faults are called ACTIVE and indicate that a problem exists. These active diagnostic codes should be investigated first.Diagnostic Codes stored in memory are called LOGGED. The problem may have been temporary or repaired since the time it was LOGGED. These codes may not mean something needs to be repaired, but may be helpful indicators when INTERMITTENT problems exist, which could be used to troubleshoot and analyze potential problems. In addition, some logged diagnostic codes record events and performance history, rather than failures.When the ignition key is first turned ON, the CHECK ENGINE/DIAGNOSTIC lamp will illuminate for five seconds (as a lamp check). The lamp will also illuminate and blink every five seconds whenever a diagnostic, action or fault code is detected by the ECM. If the lamp comes ON and stays on after initial start-up, the ECM has detected a system problem. The CHECK ENGINE/DIAGNOSTIC lamp or service tool (ECAP) can be used to identify the code(s).The CHECK ENGINE/DIAGNOSTIC lamp is also used to monitor the Idle Shutdown Timer. Ninety seconds before the programmed idle time is reached, the diagnostic lamp will start to flash at a rapid rate. If the clutch pedal or service brake pedal are used during this final ninety seconds, (diagnostic lamp flashing), the Idle Shutdown Timer will be disabled and a diagnostic code will be logged but not flashed (Diagnostic Code 01, Override of Idle Shutdown Timer) until the parking brake is again reset.Determining Diagnostic Flash Codes
Use the CHECK ENGINE/DIAGNOSTIC lamp in the cab (if equipped) to determine the diagnostic flash code. Otherwise the diagnostic code can be identified using an ECAP (Electronic Control Analyzer Programmer). Some trucks have electronic dashboards that provide a direct readout of Electronic engine diagnostic codes. Follow the truck manufacturer's instructions to obtain engine diagnostic codes.The dash mounted Cruise Control Switches are used to inquire to the ECM for system status. With the Cruise Control Switch OFF, hold the SET/RESUME switch to the RESUME position until the CHECK ENGINE/DIAGNOSTIC lamp begins to flash to indicate a two digit flash code(s).The sequence of flashes represents the system diagnostic message. The first sequence of flashes adds up to the first digit of the diagnostic flash code. After a two second pause, a second sequence of flashes will occur which represents the second digit of the diagnostic flash code.Any additional diagnostic flash codes will follow, after a pause, and will be displayed in the same manner.If the system displays a flash Code 55 (No Detected Faults) when reading diagnostic flash codes with one of the procedures, then the system has not detected any system faults.1. Turn ignition key ON (engine does not need to be started to view codes).2. The CHECK ENGINE/DIAGNOSTIC lamp will illuminate for five seconds, blink off, turn on again for five seconds, then off for five seconds (stays ON ONLY if there is an Active Diagnostic Code).3. Active diagnostic flash codes may be displayed at any time by using the Cruise Control (CC) Switches. The engine can be running or the ignition key ON. Turn the Cruise Control ON/OFF switch to OFF and move the SET/RESUME switch to RESUME position. The CHECK ENGINE/DIAGNOSTIC lamp will flash to indicate a 2-digit flash code and the switch may be released from the RESUME position.The following is a list of Electronic diagnostic codes and their descriptions. Contact an authorized Caterpillar dealer for further information or repairs.Logged Flash Codes
If the CHECK ENGINE/DIAGNOSTIC lamp comes on during engine operation, and then goes out, an intermittent fault may be occurring.The 3406C Electronic engine is equipped with permanent fault logging. It will automatically log (or remember) most intermittent diagnostic codes to help a service technician diagnose an engine problem.To read Diagnostic Codes with the CHECK ENGINE/DIAGNOSTIC lamp, the Cruise Control Switches must be used with the ON/OFF switch in the OFF position. Then move the SET/RESUME switch to the RESUME position. Refer to Determining Diagnostic Flash Codes in this section for additional information.If there are no active codes or intermittent logged code occurrences since ECM power-up, only flash Code 55 (No Detected Faults) will be displayed.Engine Operation with Active Diagnostic Codes
If the CHECK ENGINE/DIAGNOSTIC lamp is ON during normal engine operation, first check to ensure that the engine has the proper oil pressure.If low engine oil pressure occurs and the Engine Monitoring Package mode is programmed to DERATE or SHUTDOWN, the Electronic system will limit the maximum engine rpm that can be obtained until the oil pressure problem is corrected. Refer to the Engine Monitoring Package topic for additional information.If oil pressure is registering in the normal range, it is permissible to operate the engine. However, the vehicle must be driven to a dealer for maintenance.
If oil pressure is below 15 psi (103 kPa), DO NOT operate the engine. Engine damage can result.
If the Electronic engine has the proper oil pressure and the CHECK ENGINE/DIAGNOSTIC lamp is ON, this indicates that the Electronic system has identified a malfunction. An ACTIVE diagnostic code should be investigated and corrected as soon as possible. Repairing the cause of the code will shut the lamp OFF (if this is the only ACTIVE CODE).There are some codes which record an event rather than a response to a performance problem. Troubleshooting is not required for codes 35, 41, 47 and 55 and 01 will not flash out. Some codes will limit operation or performance of the engine as a result of the code being generated.* Code 31 or 36 limits engine speed (rpm) to that of the RPM @ Vehicle Speed Limit (VSL) parameter.* Code 25, 42 or 56 limits power and/or rpm.