P2141 Jeep OBD Code Diagnostic Procedure

P2141 Jeep OBD Code

EGR AIR FLOW CONTROL VALVE CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W

Theory of Operation

The EGR Air Flow Control Valve is a three-wire electrically operated throttle valve motor used to assist the EGR system function by creating a vacuum in the intake system to draw exhaust gas
into the intake manifold. The Solenoid receives 12 volts from the ECM/ASD relay, ground and a pulse-width modulated ground signal from the ECM. With the solenoid de-energized (off) the throttle valve is
in the open (full flow) position. When the ECM energizes (grounds) the throttle motor, the throttle valve closes creating a low pressure (vacuum) in the intake system. This low pressure effect helps draw
exhaust gases from the EGR Valve into the intake system.

  • When Monitored:

With the ignition on and the ECM EGR Air Flow Control Valve command off.

 

  • Set Condition:The ECM detects a short ground on the EGR Air Flow Control Valve Control circuit for 0.5 second.

 

Possible Causes
INTERMITTENT CONDITION
(F344) ASD RELAY OUTPUT CIRCUIT OPEN
(K54) EGR AIR FLOW CONTROL VALVE CONTROL CIRCUIT SHORTED TO GROUND
(K54) EGR AIR FLOW CONTROL VALVE CONTROL CIRCUIT OPEN
(Z906) GROUND CIRCUIT OPEN
EGR AIR FLOW CONTROL VALVE
ENGINE CONTROL MODULE

Diagnostic Test

1. CHECK FOR ACTIVE DTC

NOTE:
If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed
on the scan tool at the same time the DTC is displayed.

NOTE:
Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

  • Turn the ignition on.
  • With the scan tool, erase ECM DTCs.
  • Perform several ignition cycles, turning the ignition off for at least 10 seconds between each ignition cycle.
  • Monitor the scan tool for ECM DTCs.

Did this DTC set again?

Yes

  • Go To 2

No

  • Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.

(Refer to 9 – ENGINE – DIAGNOSIS
AND TESTING)


2. CHECKING FOR OTHER DTCS

NOTE:
An open ECM power supply to the ECM will cause multiple DTC’s including this DTC to set.

NOTE:
Check the ECM for other DTC’s. If other DTC’s are set with this DTC refer to the symptom list and perform the CHECKING THE ECM POWER AND GROUND CIRCUITS test before
continuing.
If the ECM power and ground circuits are functioning properly continue with this test.

Yes

  • Go To 3


3. (Z906) GROUND CIRCUIT OPEN

  • Turn the ignition off.
  • Disconnect the EGR Air Flow Control Valve harness connector.
  • Using a 12-volt test light connected to 12 volts, check the (Z906) Ground circuit at the EGR Air Flow Control Valve harness connector.

Does the test light illuminate brightly?

Yes

  • Go To 4

No

  • Repair the (Z906) Ground circuit for an open.

 

  • Perform the ECM Verification Test Ver. 1.(Refer to 9 – ENGINE – STANDARD PROCEDURE)

 


4. (F344) ASD RELAY OUTPUT CKT OPEN

 

Turn the ignition on.

Using a 12-volt test light connected to ground, check the (F344) ASD Relay Output circuit at the EGR Air Flow Control Valve harness connector.
Does the test light illuminate brightly?

Yes

  • Go To 5

No

  • Repair the (F344) ASD Relay Output circuit for an open.

 

  • Perform the ECM Verification Test Ver. 1.(Refer to 9 – ENGINE – STANDARD PROCEDURE)

 


5. (K54) EGR AIR FLOW CONTROL VALVE CONTROL CIRCUIT SHORTED TO GROUND

  • Turn the ignition off.
  • Disconnect the ECM harness connectors.
  • Measure the resistance between ground and the (K54) EGR Air Flow Control Valve Control circuit at the EGR Air Flow Control Valve harness connector.

Is the resistance above 1000 ohms?

Yes

  • Go To 6

No

  • Repair the (K54) EGR Air Flow Control Valve Control circuit for a short to ground.

 

  • Perform the ECM Verification Test Ver. 1.(Refer to 9 – ENGINE – STANDARD PROCEDURE)

 


6. (K54) EGR AIR FLOW CONTROL VALVE CONTROL CIRCUIT OPEN

 

Measure the resistance of the (K54) EGR Air Flow Control Valve Control circuit between the EGR Air Flow Control Valve harness connector and the ECM C1 harness connector.
Is the resistance below 10.0 ohms?

Yes

  • Go To 7

No

  • Repair the (K54) EGR Air Flow Control Valve Control circuit for an open.

 

  • Perform the ECM Verification Test Ver. 1.(Refer to 9 – ENGINE – STANDARD PROCEDURE)

 


7. EGR AIR FLOW CONTROL VALVE

Install a substitute EGR Air Flow Control Valve in place of the vehicle’s EGR Air Flow Control Valve.

NOTE:
Ensure the ECM and EGR Air Flow Control Valve harness connectors are connected.

  • Turn the ignition on.
  • With the scan tool, check for this DTC to set again.

Did this DTC set again?

Yes

  • Replace and program the Engine Control Module in accordance with the Service Information.

 

  • Perform the ECM Verification Test Ver. 1.(Refer to 9 – ENGINE – STANDARD PROCEDURE)

 

No

  • Replace the EGR Air Flow Control Valve.

 

  • Perform the ECM Verification Test Ver. 1.(Refer to 9 – ENGINE – STANDARD PROCEDURE)

 

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