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2009 EMERGENCY VEHICLE, 6TAA8.3-E Cummins, Engine #73045832.

CEL light on, active code...
2009 EMERGENCY VEHICLE, 6TAA8.3-E Cummins, Engine #73045832.
CEL light on, active code 2272-27-4. EGR Valve position circuit. voltage below normal.
Can you give me possible causes and trouble shooting steps for this.
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Answered in 9 minutes by:
3/27/2018
cumminsdr
cumminsdr, Mechanic
Category: Medium and Heavy Trucks
Satisfied Customers: 3,854
Experience: All types of Cummins applications
Verified

Hi Thanks for requesting me Normally I see this code 2272. when the EGR valve has failed. And the Other code 2274 is for a EGR pressure sensor The EGR differential pressure sensor is located on the intake side of the engine. make sure you remove the small pipe plugs in the intake and ensure the ports are not plugged with soot. Please take a moment to Rate/Accept my service

Fault Code: 2274
PID(P): P411
SPN: 411
FMI: 4/4
Lamp: Amber
SRT:

Exhaust Gas Recirculation Valve Delta Pressure Sensor Circuit - Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the EGR differential pressure sensor circuit.

EGR valve actuation will be disabled.

Possible causes of this fault code include:

  • A signal circuit open or shorted to ground in the engine harness or sensor
  • A supply wire open or shorted to ground
  • A malfunctioning EGR differential pressure sensor.

CodesReasonEffect

Fault Code: 2272
PID(P): P27
SPN: 27
FMI: 4/4
Lamp: Amber
SRT:

EGR Valve Position Circuit - Voltage Below Normal or Shorted to Low Source. Low signal voltage has been detected at the EGR valve position sensor circuit.

EGR valve actuation will be disabled.

Possible causes of this fault code include:

  • EGR valve position sensor wiring shorted to ground, open circuit, or shorted to power supply
  • Loss of the EGR valve position sensor supply voltage or the ground circuit.
  • Fuel Injector wiring harness shorted to ground, open circuit, or shorted to power supply.
  • Failed EGR valve
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Customer reply replied 4 months ago
I only have the 2272 p27 fmi4. Is there a troubleshooting tree or wire diagram that I can use to determine if the egr failed, or is just so common that you replace it?

If you had the fault 352 for the 5 volt supply circuit i would lead you to a power issue. Here is the tree. Your kinda wasting your time if you have power to the valve. I sent a diag of the pins for the valve . Hope it helps. And if you remove the crossover tube from the valve and notice its wet. The EGR cooler has failed. Please take a moment to Rate/Accept my service

STEP 1A. Check for sensor supply fault codes.

Conditions :

  • Turn keyswitch ON.
  • Connect INSITE™ electronic service tool.

ActionSpecification/RepairNext Step

Check for sensor supply fault codes.

  • Use INSITE™ electronic service tool to read the fault codes.

Fault Code 352 active?

YES

Fault Code 352 troubleshooting tree

Fault Code 352 active?

NO

2A

STEP 2. Check the EGR valve motor and circuit.

STEP 2A. Inspect the EGR valve motor and connector pins.

Conditions :

  • Turn keyswitch OFF.
  • Disconnect the EGR valve motor from the engine harness.

ActionSpecification/RepairNext Step

Inspect the engine harness and EGR valve motor connector pins for the following:

  • Loose connector
  • Corroded pins
  • Bent or broken pins
  • Pushed back or expanded pins
  • Moisture in or on the connector
  • Missing or damaged connector seals
  • Dirt or debris on or in the connector pins
  • Connector shell broken
  • Wire insulation damage
  • Damaged connector locking tab.

Dirty or damaged pins?

YES

Repair :

Repair the damaged pins. Repair or replace the engine harness, or replace the ECM, whichever has the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins, use electronic contact cleaner, Part Number(###) ###-####
  • Install the appropriate connector seal if it is damaged or missing.
  • Repair the engine harness. .Repair the engine harness.
  • Replace the engine harness.
  • Call for authorization to replace the ECM.

4A

Dirty or damaged pins?

NO

2B

STEP 2B. Check the sensor supply voltage and return circuit.

Conditions :

  • Turn keyswitch OFF.
  • Disconnect the EGR valve motor from the engine harness.
  • Turn keyswitch ON.

ActionSpecification/RepairNext Step

Check the supply voltage and return circuit.

  • Measure the voltage from the EGR valve position +5 volt SUPPLY pin to the EGR valve position RETURN pin at the EGR valve connector of the engine harness.

Refer to the circuit diagram or the wiring diagram for connector pin identification.

4.75 to 5.25-VDC?

YES

2C

4.75 to 5.25-VDC?

NO

3B

STEP 2C. Check the fault codes and verify the sensor condition.

Conditions :

  • Turn keyswitch OFF.
  • Connect the EGR valve motor to the engine harness.
  • Turn keyswitch ON.
  • Connect INSITE™ electronic service tool.

ActionSpecification/RepairNext Step

Check for the appropriate circuit response after 30 seconds.

  • Use INSITE™ electronic service tool to read the fault codes.

Fault Code 2272 active?

YES

3A

Fault Code 2272 active?

NO

Repair :

None. The removal and installation of the connector corrected the fault.

4A

STEP 3. Check the ECM and engine harness.

STEP 3A. Inspect the ECM and engine harness connector pins.

Conditions :

  • Turn keyswitch OFF.
  • Disconnect the engine harness from the ECM connector.

ActionSpecification/RepairNext Step

Inspect the engine harness and ECM connector pins for the following:

  • Loose connector
  • Corroded pins
  • Bent or broken pins
  • Pushed back or expanded pins
  • Moisture in or on the connector
  • Missing or damaged connector seals
  • Dirt or debris on or in the connector pins
  • Connector shell broken
  • Wire insulation damage
  • Damaged connector locking tab.

Dirty or damaged pins?

YES

Repair :

Repair the damaged pins. Repair or replace the engine harness, or replace the ECM, whichever has the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins, use electronic contact cleaner, Part Number(###) ###-####
  • Install the appropriate connector seal if it is damaged or missing.
  • Call for authorization to replace the ECM.

4A

Dirty or damaged pins?

NO

3A-1

STEP 3A-1. Check for an open circuit in the engine harness.

Conditions :

  • Turn keyswitch OFF.
  • Disconnect the engine harness from the ECM connector.
  • Disconnect the engine harness from the EGR valve motor.

ActionSpecification/RepairNext Step

Check for an open circuit in the EGR position circuit.

  • Measure the resistance between the EGR valve position SIGNAL A pin at the EGR valve engine harness connector and the EGR valve position SIGNAL A pin at the ECM engine harness connector.
  • Measure the resistance between the EGR valve position SIGNAL B pin at the EGR valve engine harness connector and the EGR valve position SIGNAL B pin at the ECM engine harness connector.
  • Measure the resistance between the EGR valve position SIGNAL C pin at the EGR valve engine harness connector and the EGR valve position SIGNAL C pin at the ECM engine harness connector.

Refer to the circuit diagram or the wiring diagram for connector pin identification.

Less than 10 ohms?

YES

3A-2

Less than 10 ohms?

NO

Repair :

An open circuit has been detected in the engine harness.

Repair or replace the engine harness.

4A

STEP 3A-2. Check for a short circuit in the engine harness.

Conditions :

  • Turn keyswitch OFF.
  • Disconnect the engine harness from the ECM connector.
  • Disconnect the engine harness from the EGR valve motor.

ActionSpecification/RepairNext Step

Check for an short circuit in the EGR position circuit.

  • Measure the resistance between the EGR valve position SIGNAL A pin at the ECM engine harness connector and all other pins in the ECM connector.
  • Measure the resistance between the EGR valve position SIGNAL B pin at the ECM engine harness connector and all other pins in the ECM connector.
  • Measure the resistance between the EGR valve position SIGNAL C pin at the ECM engine harness connector and all other pins in the ECM connector.

Refer to the circuit diagram or the wiring diagram for connector pin identification.

Greater than 100k ohms?

YES

3A-3

Greater than 100k ohms?

NO

Repair :

A short circuit has been detected in the engine harness.

Repair or replace the engine harness.

4A

STEP 3A-3. Check for a short circuit to ground.

Conditions :

  • Turn keyswitch OFF.
  • Disconnect the engine harness from the ECM connector.
  • Disconnect the engine harness from the EGR valve motor.

ActionSpecification/RepairNext Step

Check for a short circuit to ground.

  • Measure the resistance between the EGR valve position SIGNAL A pin at the ECM engine harness connector and ground.
  • Measure the resistance between the EGR valve position SIGNAL B pin at the ECM engine harness connector and ground.
  • Measure the resistance between the EGR valve position SIGNAL C pin at the ECM engine harness connector and ground.

Refer to the circuit diagram or the wiring diagram for connector pin identification.

Greater than 100k ohms?

YES

3A-4

Greater than 100k ohms?

NO

Repair :

A short circuit to ground has been detected in the engine harness.

Repair or replace the engine harness.

4A

STEP 3A-4. Check the fault codes.

Conditions :

  • Turn keyswitch OFF.
  • Connect the engine harness to the ECM connector.
  • Connect the EGR valve to the engine harness.
  • Turn keyswitch ON.
  • Connect INSITE™ electronic service tool.

ActionSpecification/RepairNext Step

Check for the appropriate circuit response after 30 seconds.

  • Use INSITE™ electronic service tool to read the fault codes.

Fault Code 2272 active?

YES

Repair :

Replace the EGR valve.

4A

Fault Code 2272 active?

NO

Repair :

None. The removal and installation of the connector corrected the fault.

4A

STEP 3B. Inspect the ECM and engine harness connector pins.

Conditions :

  • Turn keyswitch OFF.
  • Disconnect the engine harness from the ECM connector.

ActionSpecification/RepairNext Step

Inspect the engine harness and ECM connector pins for the following:

  • Loose connector
  • Corroded pins
  • Bent or broken pins
  • Pushed back or expanded pins
  • Moisture in or on the connector
  • Missing or damaged connector seals
  • Dirt or debris on or in the connector pins
  • Connector shell broken
  • Wire insulation damage
  • Damaged connector locking tab.

Dirty or damaged pins?

YES

Repair :

Repair the damaged pins. Repair or replace the engine harness, or replace the ECM, whichever has the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins, use electronic contact cleaner, Part Number(###) ###-####
  • Install the appropriate connector seal if it is damaged or missing.
  • Call for authorization to replace the ECM.

4A

Dirty or damaged pins?

NO

3B-1

STEP 3B-1. Check the sensor supply voltage and return circuit.

Conditions :

  • Turn keyswitch OFF.
  • Disconnect the engine harness from the ECM connector.
  • Turn keyswitch ON.

ActionSpecification/RepairNext Step

Check the supply voltage and return circuit.

  • Measure the voltage from the EGR valve position +5 volt SUPPLY pin to EGR valve position RETURN pin at the ECM engine connector.

Refer to the circuit diagram or the wiring diagram for connector pin identification.

4.75 to 5.25-VDC?

YES

3B-2

4.75 to 5.25 -VDC?

NO

Repair :

Call for authorization to replace the ECM.

4A

STEP 3B-2. Check for an active fault code.

Conditions :

  • Connect all components.
  • Turn keyswitch ON.
  • Connect INSITE™ electronic service tool.

ActionSpecification/RepairNext Step

Check for the appropriate circuit response after 30 seconds.

  • Use INSITE™ electronic service tool to read the fault codes.

Fault Code 2272 active?

YES

Repair :

An open circuit has been detected in the engine harness.

Repair or replace the engine harness.

4A

Fault Code 2272 active?

NO

Repair :

None. The removal and installation of the connector corrected the fault.

4A

STEP 4. Clear the fault code.

STEP 4A. Disable the fault code.

Conditions :

  • Connect all components.
  • Turn keyswitch ON.
  • Connect INSITE™ electronic service tool.

ActionSpecification/RepairNext Step

Disable the fault code.

  • Start the engine and let it idle for 1 minute.
  • Use INSITE™ electronic service tool to verify that the fault code is inactive.

Fault Code 2272 inactive?

YES

4B

Fault Code 2272 inactive?

NO

Repair :

Return to the troubleshooting steps or contact a Cummins® Authorized Repair Location if all the steps have been completed and checked again.

STEP 4B. Clear the inactive fault codes.

cumminsdr
cumminsdr, Mechanic
Category: Medium and Heavy Trucks
Satisfied Customers: 3,854
Experience: All types of Cummins applications
Verified
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