‘Stop Engine’ caution light question

June 27, 2025, 07:15:07 pm

After the Stop Engine light illuminates, does it have to be reset somehow, or should it go out if the problem is remedied?
I am assuming the light initially came on due to the engine coolant problem which has been fixed, but the light remains on. Everything seems to be normal; engine oil, trans fluid, coolant level, pressures.
Thanks, Mike

Re: ‘Stop Engine’ caution light question

Reply #1 – June 27, 2025, 07:17:54 pm

Is the steel coolant tank full. There is a sensor on the side of the tank that tells whether there is enough coolant. I am not aware of a reset.

Re: ‘Stop Engine’ caution light question

Reply #2 – June 27, 2025, 08:58:16 pm

Yes, tank is full. Overflow tank at proper level.

I will add, after the ignition is turned on, and before start, gauges and caution lights go through their routine test, the Stop Engine caution light will illuminate, even without engine start.

I can't find anything in the manual concerning this light. What are the causes or cause for the illumination of this light. Is it just coolant, or something else? Could the light be held in memory and cancelled with one of those obd whatever analyzer devices?

Grok:

The stop engine light on a 1997 Foretravel with a Cummins M11 diesel engine remaining on indicates that the Engine Control Module (ECM) has detected a fault that requires attention. Based on available information and common issues with Cummins M11 engines, here are potential reasons for the persistent stop engine light and steps to diagnose the issue:
Potential Causes
1. Sensor Malfunction:
   • Intake Manifold Pressure Sensor: A common issue with the Cummins M11 is a fault related to the intake manifold pressure sensor, which can trigger a fault code like 433 (SAE fault 102-2). This occurs when the ECM detects boost pressure readings that are inconsistent with engine operating conditions, often at idle, causing the ECM to derate the engine and keep the stop engine light on. The sensor or its wiring may be faulty.
   • Coolant Level Sensor: Low coolant levels or a malfunctioning coolant level sensor in the surge tank can trigger the stop engine light. This is common in vehicles like motorhomes or heavy-duty trucks, where the sensor may detect low coolant or have wiring issues.
   • Crankcase Pressure Sensor: Moisture buildup or a faulty crankcase pressure sensor can cause erroneous readings, triggering the light.
   • Other Sensors: Faulty sensors like the throttle position sensor (TPS), fuel pressure sensor, or oil pressure sensor could also be culprits, as the ECM monitors multiple parameters.
2. Wiring or Electrical Issues:
   • Given the age of a 1997 vehicle, wiring harness issues are common. Corroded, loose, or damaged wiring to sensors (e.g., intake manifold pressure sensor or TPS) can cause the ECM to log fault codes and illuminate the stop engine light.
   • Intermittent electrical faults, such as poor connections at the ECM or sensor plugs, can also keep the light on.
3. Fuel System Problems:
   • Lift Pump Issues: The Cummins M11 relies on a lift pump to supply fuel to the injection system. A failing lift pump can cause insufficient fuel pressure, leading to performance issues and triggering the stop engine light.
   • Fuel Solenoid or Shutoff Valve: A sticky or malfunctioning fuel shutoff solenoid can cause issues, though this is more likely to affect engine starting or shutdown rather than just the light.
   • Fuel Line Restrictions: Restrictions or air leaks in the fuel system can cause the ECM to detect improper fuel delivery, triggering the light.
4. ECM or Fault Code Issues:
   • The ECM may have logged an active or inactive fault code that needs to be read and cleared. Even if the issue is resolved, the light may remain on until the code is cleared using a diagnostic tool like Cummins INSITE.
   • Specific fault codes (e.g., 433 for intake manifold pressure or 3251 for aftertreatment issues) can provide clues to the exact issue. Without reading the codes, it's challenging to pinpoint the cause.
5. Intake Heater Relay:
   • In some cases, the stop engine light may be related to the intake heater relay. If the relay is malfunctioning, it may cause the ECM to detect an issue, especially if you hear "clicks" near the starter when the engine is off, as noted in similar cases. This could indicate the relay is engaging improperly.
6. Other Mechanical Issues:
   • Low Oil or Coolant Levels: The M11's ECM monitors oil and coolant levels, and low levels can trigger the stop engine light as a protective measure.
   • Turbocharger or Boost Issues: A boost leak or turbo-related issue (e.g., clogged air filter, damaged charge air cooler) could cause low boost pressure, triggering the light.
   • Injector Problems: A faulty injector or related issue may cause the ECM to detect a misfire or performance issue, illuminating the light.
Diagnostic Steps
1. Check Fault Codes:
   • Use a diagnostic tool like Cummins INSITE to retrieve active and inactive fault codes from the ECM. This is critical to identify the specific issue (e.g., code 433 for intake manifold pressure or 3251 for aftertreatment). If you don't have access to INSITE, a qualified diesel mechanic or dealer can perform this scan.
   • If no codes are present, the issue may be intermittent, and inactive codes should still be checked.
2. Inspect Sensors and Wiring:
   • Check the intake manifold pressure sensor (located at the back of the intake manifold, typically a 3-wire sensor) for proper operation and secure connections. Inspect the wiring for corrosion or damage.
   • Verify the coolant level sensor in the surge tank and its wiring. Ensure coolant levels are adequate.
   • Inspect the crankcase pressure sensor and other relevant sensors (e.g., TPS, oil pressure) for faults or wiring issues.
3. Check Fluid Levels:
   • Verify engine oil and coolant levels. Low levels can trigger the stop engine light as a protective measure.
4. Inspect the Fuel System:
   • Check the lift pump for proper pressure (the M11 typically requires 10-11.5 PSI at idle, but pressure can drop under load if the pump is failing).
   • Inspect fuel lines for restrictions, leaks, or air ingress. Replace the fuel filter if it hasn't been changed recently.
5. Test the Intake Heater Relay:
   • If you hear "clicking" sounds near the starter when the engine is off, test the intake heater relay. Replace it if faulty, as it may be triggering the ECM to keep the light on.
6. Clear Codes and Test:
   • After addressing potential issues, clear the fault codes using a diagnostic tool. If the light persists, recheck for new codes or intermittent issues.
Additional Notes
• Intermittent Light Behavior: If the stop engine light comes on intermittently (e.g., goes off after stopping the engine for 7-10 minutes), it could indicate a sensor or wiring issue that resets when the engine cools or the ECM recalibrates.
• Dealer or Mechanic: If you cannot access a diagnostic tool or identify the issue, take the vehicle to a Cummins-certified technician or dealer. They can use INSITE to monitor sensor values in real-time while driving and pinpoint the exact cause.
• Specific to 1997 M11: The M11 Celect engine in a 1997 Ford may have unique wiring or ECM quirks due to its age. Ensure any replacement parts (e.g., sensors) are compatible with the M11 Celect or Celect Plus system.
Why This Happens
The stop engine light is part of the ECM's protective mechanism, designed to alert the driver to conditions that could damage the engine, such as low fluid levels, sensor malfunctions, or fuel delivery issues. The ECM logs fault codes when sensor readings deviate from expected ranges, and the light remains on until the issue is resolved and the code is cleared.
If you can provide additional details (e.g., fault codes, engine behavior like power loss or idling issues, or recent maintenance), I can narrow down the cause further. Would you like instructions on how to retrieve fault codes manually (if possible) or more details on any specific step? Alternatively, I can search for additional information if needed.

Mike

Re: ‘Stop Engine’ caution light question

Reply #3 – June 27, 2025, 11:16:10 pm

When I had a bad coolant sensor on my 2004 U270, the light came on and then the engine shut off. I restarted the engine and it ran for about 20-30 seconds before the light came back on and the engine shut off. I did this multiple times to get the coach to a spot where I could work on it. After I replaced the sensor, the light never came on again. I don't know whether your coach is set up the same, but on mine replacing the sensor reset the light.

Re: ‘Stop Engine’ caution light question

Reply #4 – June 28, 2025, 12:35:22 am

You need to check the codes to see why the light is on.

Re: ‘Stop Engine’ caution light question

Reply #5 – June 28, 2025, 01:10:07 am

Quote from: red tractor – June 27, 2025, 07:17:54 pm

Is the steel coolant tank full. There is a sensor on the side of the tank that tells whether there is enough coolant. I am not aware of a reset.

So with a bad sensor or low coolant it still will start.. when I changed the sensor it started normally. It will shut off at 30 seconds. The stop engine will be displayed before the engine is running for other issues. Low oil pressure for example.

Re: ‘Stop Engine’ caution light question

Reply #6 – June 28, 2025, 07:38:20 am

How can you have low oil pressure if the engine is not running.

Re: ‘Stop Engine’ caution light question

Reply #7 – June 28, 2025, 09:12:26 am

Ignition key is in the RUN position but has not been cranked yet. Prior to starting.

Re: ‘Stop Engine’ caution light question

Reply #8 – June 30, 2025, 09:24:14 pm

Quote from: Yetch – June 27, 2025, 08:58:16 pm

Grok: ....

I think grok left out the most important thing, unplugging and plugging the coach back in

Re: ‘Stop Engine’ caution light question

Reply #9 – July 01, 2025, 08:01:43 am

You might try disconnecting the stat battery ground cable for a couple of minutes to reset the ECM. If the light remains on you have other issues that need to be addressed.

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