mil no codes - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 12-30-2008, 02:40 AM Thread Starter
 
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mil no codes

Got a mil, checked it was a p0128. lost code before i could see what it was. went to check it again no code just ------done. Found what i wrote code on "thermostat Rationality". What does that mean and why does the code not come up anymore but the mil is still on? thanks. 07 6.7 6speed auto quad 4x4
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post #2 of 6 (permalink) Old 12-30-2008, 03:03 AM
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probably just a qwirk in the system. The service manual refers to them as " INTERMITTENT CONDITION "

Or, you may have a problem with one of the following.....

COOLING FAN
COOLANT TEMPERATURE SENSOR
THERMOSTAT

check all the connections. If you can, put some dielectric grease in them. The T-stat may have stuck for a minute. It's nothing devastating but, keep an eye on your water temp.
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post #3 of 6 (permalink) Old 12-30-2008, 03:07 AM Thread Starter
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thanks all seems ok but the mil is still on and it wont show me any codes. Trip to the dodge dr is in my future i guess.
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post #4 of 6 (permalink) Old 12-30-2008, 03:11 AM
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or, just go to your local auto parts store and barrow a scanner to clear the code. There's obviously one in there some where if the light is staying on. If you get it cleared and it doesn't come back... you're good to go
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post #5 of 6 (permalink) Old 01-01-2009, 11:02 PM
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understand that some ecms are programmed to run a cycle for about 150 miles before they are completely ok, it won't hurt anything but for inspection purposes you need to drive around before going to an inspection station.
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post #6 of 6 (permalink) Old 01-02-2009, 07:46 PM
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Quote:
Originally Posted by BigRed6.7CTD View Post
understand that some ecms are programmed to run a cycle for about 150 miles before they are completely ok, it won't hurt anything but for inspection purposes you need to drive around before going to an inspection station.
I know this is 5.9L information but it might just fit... (Who knows)

The PCM and ECM monitor many different circuits in the powertrain system. If the ECM or PCM senses a problem with a monitored circuit often enough to indicate an actual problem, it stores a Diagnostic Trouble Code (DTC) in the ECM’s or PCM’s memory. With certain DTC’s, if the problem is repaired or ceases to exist, the ECM or PCM cancels the code after 40 warm-up cycles. Certain other DTC’s may be cancelled after 1 or 2 good “trips”. Refer to Trip Definition. DTC’s that affect vehicle emissions illuminate the Malfunction Indicator Lamp (MIL). The MIL is displayed as an engine icon (graphic) on the instrument panel. Refer to Malfunction Indicator Lamp.

Certain DTC’s will set a “P1693 companion DTC” in the opposite control module. This means that after repair, the DTC must be erased from both modules. Certain criteria must be met before the ECM or PCM will store a DTC in memory. The criteria may be a specific range of engine RPM, throttle opening, engine temperature or input voltage. The ECM or PCM might not store a DTC for a monitored circuit even though a malfunction has occurred. This may happen because one of the DTC criteria for the circuit has not been met. For example, assume the DTC criteria requires the ECM to monitor the circuit only when the engine operates between 750 and 2000 RPM. Suppose the sensor’s output circuit shorts to ground when engine operates above 2400 RPM (resulting in 0 volt input to the ECM). Because the condition happens at an engine speed above the maximum threshold (2000 rpm, the ECM will not store a DTC. There are several operating conditions for which the ECM and PCM monitors and sets DTC’s. Refer to Monitored Systems, Components, and Non-Monitored Circuits.

Refer to the Diagnostic Trouble Code chart (list). Remember that DTC’s are the results of a system or circuit failure, but do not directly identify the failed component or components. Various diagnostic procedures may actually cause a diagnostic monitor to set a DTC. For instance, disconnecting a relay or removing an electrical connector while the engine is running. When a repair is completed and verified, connect the DRB scan tool to the 16–way data link connector to erase all ECM and PCM DTC’s and extinguish the MIL.

Self Erasing Of Error Codes
Trip Indicator
The Trip is essential for running monitors and extinguishing the MIL. In OBD II terms, a trip is a set of vehicle operating conditions that must be met for a specific monitor to run. All trips begin with a key cycle.

Good Trip
The Good Trip counters are as follows:
● Specific Good Trip
● Fuel System Good Trip
● Misfire Good Trip
● Alternate Good Trip (appears as a Global Good Trip on DRB III)
● Comprehensive Components
● Major Monitor
● Warm-Up Cycles

Specific Good Trip
The term Good Trip has different meanings depending on the circumstances:
●If the MIL is OFF, a trip is defined as when the Oxygen Sensor Monitor and the Catalyst Monitor have been completed in the same drive cycle.
● If the MIL is ON and a DTC was set by the Fuel Monitor or Misfire Monitor (both continuous monitors), the vehicle must be operated in the Similar Condition Window for a specified amount of time.
● If the MIL is ON and a DTC was set by a Task Manager commanded once-per-trip monitor (such asthe Oxygen Sensor Monitor, Catalyst Monitor, Purge Flow Monitor, Leak Detection Pump Monitor, EGR Monitor or Oxygen Sensor Heater Monitor), a good trip is when the monitor is passed on the next startup.
● If the MIL is ON and any other emissions DTC was set (not an OBD II monitor), a good trip occurs when the Oxygen Sensor Monitor and Catalyst Monitor have been completed, or two minutes of engine run time if the Oxygen Sensor Monitor and Catalyst Monitor have been stopped from running.

Fuel System Good Trip
To count a good trip (three required) and turn off the MIL, the following conditions must occur:
● Engine in closed loop
● Operating in Similar Conditions Window
● Short Term multiplied by Long Term less than threshold
● Less than threshold for a predetermined time If all of the previous criteria are met, the PCM will count a good trip (three required) and turn off the MIL.

Misfire Good Trip
If the following conditions are met the PCM will count one good trip (three required) in order to turn off the MIL:
● Operating in Similar Condition Window
● 1000 engine revolutions with no misfire

Warm-Up Cycles
Once the MIL has been extinguished by the Good Trip Counter, the PCM automatically switches to a Warm-Up Cycle Counter that can be viewed on the DRB III. Warm-Up Cycles are used to erase DTCs and Freeze Frames. Forty Warm-Up cycles must occur in order for the PCM to self-erase a DTC and Freeze Frame. A Warm-Up Cycle is defined as follows:
● Engine coolant temperature must start below and rise above 160° F
● Engine coolant temperature must rise by 40° F
● No further faults occur

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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