What to do when you have a problem with your DDEC engine?
What to do when you have a problem with your DDEC engine?
When you have a problem like this, the first thing you need to do is check the throttle positioning sensor. The DDEC III and DDEC IV engine controllers do not use an idle validation like the ones in a Caterpillar or Cummins engine.
Is there idle validation on DDEC III engine?
The DDEC III and DDEC IV engine controllers do not use an idle validation like the ones in a Caterpillar or Cummins engine. So, before you start going through all the diagnostic tests for testing an intermittent power loss, you should take a hard look at the throttle positioning sensor.
Where are DDEC V codes stored in the ECU?
DDEC V provides an indication of engine and vehicle malfunctions. The ECU continually monitors the DDEC V system. Any faults that occur are stored as codes in the ECU’s memory. These codes can be accessed in any of three ways:
Where is the harness on a DDEC truck?
The most likely location is the primary OEM wiring harness that links the DDEC’s engine controller to the connectors on the firewall. This harness supplies the input and output signals for both the Jake and the engine fan. This is the first harness that we needed to remove from the truck and inspect.
When you have a problem like this, the first thing you need to do is check the throttle positioning sensor. The DDEC III and DDEC IV engine controllers do not use an idle validation like the ones in a Caterpillar or Cummins engine.
How does a DDEC III engine controller work?
DDEC III and DDEC IV engine controllers will go into a sensor recalibration mode, without showing any signs other than a sharp drop in interpreted throttle position, as the sensor recalibrates over and over again, after seeing something that is out of the expected voltage range. How did we fix this problem?
The most likely location is the primary OEM wiring harness that links the DDEC’s engine controller to the connectors on the firewall. This harness supplies the input and output signals for both the Jake and the engine fan. This is the first harness that we needed to remove from the truck and inspect.
Why is my Jake engine fan not working?
This harness supplies the input and output signals for both the Jake and the engine fan. This is the first harness that we needed to remove from the truck and inspect. The second possibility is that the Jake and fan override input signals are interfering with one another in the dashboard wiring harnesses.
What kind of ECM does Detroit Diesel use?
This holds true with both Bendix and Williams throttle positioning sensors (the ECM doesn’t care who made the throttle positioning sensor – it only cares about the voltage range). Also, if you have Detroit Diesel Diagnostic Link, you can see how the engine controller interprets those voltages.
This holds true with both Bendix and Williams throttle positioning sensors (the ECM doesn’t care who made the throttle positioning sensor – it only cares about the voltage range). Also, if you have Detroit Diesel Diagnostic Link, you can see how the engine controller interprets those voltages.
DDEC III and DDEC IV engine controllers will go into a sensor recalibration mode, without showing any signs other than a sharp drop in interpreted throttle position, as the sensor recalibrates over and over again, after seeing something that is out of the expected voltage range. How did we fix this problem?
What kind of sensor harness does a DDEC engine use?
The DDEC III/IV engine sensor harness for vehicle engines was originally equipped with five metal retaining clips and was secured to the engine cylinder block with bolts. Effective with engines built in May of 1995, three of the metal clips were replaced by three plastic push-in clips. See Figure “Typical DDEC III/IV Engine Sensor Harness” .
How to troubleshoot Series 60 Detroit Diesel engine?
Remove the 30-pin connector from the ECM by loosening the connector attaching bolt. Carefully pull the connector from the ECM and remove the harness from the engine. Install the 30-pin connector to the ECM, and torque the connector body attaching bolt to 0.79-1.47 N·m (7-13 lb· in.).
How to remove a series 60 cylinder head?
Remove the air cleaner and charge air cooler ducting from turbocharger and intake manifold. Refer to “6.2.2 Removal and Cleaning of Air Cleaner” and refer to “6.3.2 Removal of Intake Manifold” . Disconnect the turbocharger coolant supply (if water-cooled), oil supply and drain lines, and remove the turbocharger if necessary.
How to remove a cylinder head from a Detroit Diesel?
Refer to “6.5.2 Removal and Cleaning of Turbocharger” . Remove the air cleaner and charge air cooler ducting from turbocharger and intake manifold. Refer to “6.2.2 Removal and Cleaning of Air Cleaner” and refer to “6.3.2 Removal of Intake Manifold” .
