P0489-EGR SOLENOID CIRCUIT SHORT CIRCUIT





For a complete wiring diagram Refer to Section 8W


  • When Monitored:

    With the ignition on and the ECM EGR Solenoid command on.

  • Set Condition:

    The ECM detects excessive current on the EGR Solenoid Control circuit.


Possible Causes
  
INTERMITTENT CONDITION
  
ASD RELAY OUTPUT CIRCUIT OPEN
  
(K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
  
(K35) EGR SOLENOID CONTROL CIRCUIT OPEN
  
EGR SOLENOID
  
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.







Did this DTC set again?

Yes
  • Go To 2


No

2.CHECKING FOR OTHER DTCS

NOTE: An open ASD 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.ASD OUTPUT CKT OPEN








Does the test light illuminate brightly?

Yes
  • Go To 4


No

4.(K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND





Is the resistance above 1000 ohms?

Yes
  • Go To 5


No

5.(K35) EGR SOLENOID CONTROL CIRCUIT OPEN



Is the resistance below 10.0 ohms?

Yes
  • Go To 6


No

6.EGR SOLENOID


NOTE: Ensure the ECM and EGR Solenoid harness connectors are connected.





Did this DTC set again?

Yes


No