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mp7 trouble


mixer711
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hey guys, i got a 07 granite with a 395c motor. When i first started driving it a year ago it had no boost. finaly four months ago we had a licence mack shop put a turbo on it. Now it has lots of boost at the bottom but after it starts pulling a hill it loses power and shutdown light comes on. the code is p412 m128. we replaced the tube on the drivers side that has the two sensors along with the ecu? ecm? that didn't help. can anyone read the code for me and suggest what could be the problem.

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Go to "macktrucks.com" then click on "parts and service". Then in the middle of page click on "mack emedia center". In the "keyword" space type in 8-213 and hit go. then click on the red "8-213" and then hit "view file". At this point you can save or view the entire troubleshooting manual for free, the later print it out if you want. Almost every manual, bulletin and guide mack ever produced is the the the E-Media for free. Most people dont know that, us dealers use this alot! This code is MID-128 PID-412 and if the F number (FMI) is 0 the your EGR cooler is clogged with soot and needs to be washed out.

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Failure Mode Identifier (FMI): 0 (Valid High), 3 (Voltage High/Open), 4 (Voltage Low), 5 (Current Low/Open), 9 (Data Absent)

Parameter Identification (PID): P412

Message Identification (MID): 128

Circuit Description: The EGR Mass Flow Sensor consists of an exhaust gas temperature probe, a heater probe, and a dedicated electronic processor. The EGR Electronic Control Unit (EGR ECU) supplies the heater probe with a 12 volt power source. The EGR ECU then monitors the amount of current required to maintain the heater probe at 752°F. The EGR ECU also monitors the exhaust gas temperature signal from the temperature probe and uses this signal and the heater current signal to calculate EGR flow. The EGR ECU transmits error messages and EGR Mass Flow data to the Engine Management System (EMS) Module over the J1939 serial data lines.

Location: The EGR temperature probe and heater probe are located in the EGR tube between the EGR cooler and the intake manifold. The EGR Mass Flow Sensor assembly is supplied from the manufacturer as a single calibrated unit. The components of the sensor are not to be replaced individually.

Code Setting Conditions: Code PID 412 will set with FMI 0 if the EGR ECU detects the exhaust gas temperature exceeds 365°F (185°C) for 30 minutes, 410°F (210°C) for 25 seconds or 455°F (235°C) for 3 seconds. Code PID 412 will set with FMI 3 if the EGR ECU detects a short circuit to voltage in the exhaust gas temperature probe circuit. Code PID 412 will set with FMI 4 if the EGR ECU detects a short circuit to ground in the exhaust gas temperature probe circuit. Code PID 412 will set with FMI 5 if the EGR ECU detects an open in the exhaust gas temperature probe circuit. Code PID 412 will set with FMI 9 if the EGR ECU signal is missing on the J1939 serial data lines.

Judging by your description of the problem, it might have an FMI:0--data valid but high. What that means is the egr cooler is most likely plugged. When under a hard pull the egr temp gets too high and the engine ecu starts to cut back power. The egr cooler needs to be removed and cleaned.

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Thanks guys, your both right about the FMI 0. This makes alot of sense, as the cooler has probably bin pluged awhile but was not a problem untill the trubo was replaced and working. Hopefully with this new insight i can get it fixed. This thing pulls like a train when its working, tks again.

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