The crank cycle and the number of crank cycles are programmable. The crank cycle is the amount of time for engagement of the starting motor. This also includes the amount of time for cooling of the starting motor between crank cycles. If the engine does not start within the number of crank cycles that are programmed, "ENGINE FAILURE TO START SHUTDOWN" will be displayed on the EMCP 4 in order to inform the operator of an overcrank condition.
Note: Refer to the engine Troubleshooting manual for more information on engine starting and engine cranking for your particular genset.
Starting parameters differ from package to package. Starting can be controlled by either the EMCP or the ADEM. EMCP controlled starting parameters can be configured through the EMCP screens or from ET, within the "Automatic Start/Stop" submenu, "Engine Operating State Configuration" parameter. During the EMCP programming, the parameter identification messages remain consistent with those in Cat ET. If the ADEM controls starting, the configuration must be accomplished via ET. It is important to note it is always possible to adjust cranking control parameters at the EMCP regardless of which ECM is controlling the starter. However, there will be no affect upon the cranking process when the ADEM controls cranking. Consulting the package wiring diagrams should provide the best information regarding which ECM is actually controlling the cranking process. The Starter Motor Mg Switch (SMMS) coil wiring is the indicator of the controlling ECM. Connection of the SMMS coil to the EMCP indicates control via the EMCP, and conversely SMMS coil connection to the ADEM indicates ADEM cranking control.
Conditions Which Generate This Code:
The code for the engine overcrank is generated when the EMCP 4 determines that an engine overcrank condition has occurred.
Test Step 1. PERFORM THE INITIAL CHECK.
- Check for active diagnostic codes on the Engine ECM and the EMCP 4. If any codes are present, correct the diagnostic codes first.
Expected Result:
No other diagnostic codes or indicators are active.
Results:
- OK - No other diagnostic codes or indicators are active. Proceed to Test Step 2
- NOT OK - Another diagnostic code is active or an indicator is active.
Repair: Exit this procedure. Troubleshoot the active code or indicator. Resume normal operation and verify that the problem has been corrected.
STOP
Test Step 2. CHECK THE SETPOINTS.
- View the setpoints ("Crank Duration", "Crank Cycle Rest Interval", and "Maximum Number of Crank Cycles"). Make a note of the setpoints. Refer to Testing and Adjusting, "Electronic Control Module (Generator Set) - Configure". Compare the setpoints against the default setpoints of the particular generator set.
Expected Result:
The setpoints are correct.
Results:
- OK - The setpoints are correct for your particular genset. Proceed to Test Step 3 for MUI engines. Proceed to Test step 4 for EUI engines.
- NOT OK - The setpoints are NOT correct.
Repair: Reprogram the setpoints. Reset the genset. Resume normal operation and verify that the problem has been corrected.
STOP
Test Step 3. INSPECT THE GOVERNOR POWER SOURCE AND WIRING. (MUI ENGINES ONLY)
Refer to the Electrical System Schematic for the Generator Set in the Service Manual for an accurate representation of the genset that is being serviced.
- Verify that the emergency stop push button is not pressed
- Verify the relay common pin programmed for E-Stop on the EMCP 4 is connected to battery negative through a normally open contact on the emergency stop switch (if programmed for active low).
- Verify the fuel control relay output of the EMCP 4 is connected to terminal 2 on the 2301A governor and verify the in line fuse is not open.
- Verify terminal 1 on the 2301A is connected to battery negative.
Expected Result:
The 2301A Governor power Source and wiring are correct.
Results:
- OK - The wiring is correct. The EMCP 4 may have failed.
Repair: It is unlikely that the EMCP 4 has failed. Exit this procedure and perform this procedure again. If the failure is not found, replace the EMCP 4.
STOP
- NOT OK - The wiring is not correct.
Repair: Repair the wiring or replace the wiring. Reset the genset. Resume normal operation and verify that the problem has been corrected.
STOP
Test Step 4. CHECK COMMUNICATIONS BETWEEN EMCP 4 AND ENGINE ECM. (EUI ENGINES ONLY)
- Use Cat ET in order to verify that the fuel enable input on the Engine ECM is configured for "CAN Input".
- Refer to the Electrical System Schematic for the Generator Set in the Service Manual and check the data link wiring between the EMCP 4 and the Engine ECM. See Troubleshooting, "Data Link Circuit Fault"
Results:
- OK - The data link wiring is correct. The EMCP 4 may have failed.
Repair: It is unlikely that the EMCP 4 has failed. Exit this procedure and perform this procedure again. If the failure is not found, replace the EMCP 4.
STOP
- NOT OK - The wiring is not correct.
Repair: Repair the wiring or replace the wiring. Reset the genset. Resume normal operation and verify that the problem has been corrected.
STOP