Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1355
P0490-EGR CONTROL CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W
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•
When Monitored:
With the ignition on and the EGR Solenoid command on.
•
Set Condition:
The ECM detects excessive current on the (K34) EGR Solenoid Control circuit for 2.0 seconds.
Possible Causes
INTERMITTENT DTC
(K34) EGR SOLENOID CONTROL CIRCUIT SHORTED TO VOLTAGE
(K34) EGR SOLENOID CONTROL CIRCUIT SHORTED TO THE (K343) FUSED ASD RELAY OUTPUT 2
CIRCUIT
(K34) EGR SOLENOID CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
EGR VALVE
ENGINE CONTROL MODULE (ECM)
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
With the scan tool, actuate the EGR Solenoid at 100%.
Monitor the scan tool for at least two minutes.
Start the engine.
With the scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
>> Go To 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
(K34) EGR SOLENOID CONTROL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the EGR Solenoid connector.
Disconnect the Engine Control Module connector.
Remove the ASD Relay from the IPM.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD
Relay Connector.
Turn the ignition on.
Measure the voltage of the (K34) EGR Solenoid Control circuit in the
EGR Solenoid connector.
Is there any voltage present?
Yes
>> Repair the (K34) EGR Solenoid Control circuit for a short to
voltage.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Go to 3
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3.
(K34) EGR SOLENOID CONTROL CIRCUIT SHORTED TO THE (K343) FUSED ASD RELAY OUTPUT 2
CIRCUIT
Turn the ignition off.
Measure the resistance between the (K34) EGR Solenoid Control circuit
and the (K343) Fused ASD Relay Output 2 circuit in the EGR Solenoid
connector.
Is the resistance above 1000.0 ohms?
Yes
>> Go to 4
No
>> Repair the (K34) EGR Solenoid Control circuit for a short to
the (K343) Fused ASD Relay Output 2 circuit.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
4.
(K34) EGR SOLENOID CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
Measure the resistance of the (K34) EGR Solenoid Control circuit
between the EGR Solenoid connector and the Engine Control Module
(ECM) connector.
Is the resistance below 10.0 ohms?
Yes
>> Go to 5
No
>> Repair the (K34) EGR Solenoid Control circuit for an open
circuit or high resistance.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
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5.
EGR VALVE
Connect the Engine Control Module (ECM) connector.
Turn the ignition on.
With the scan tool, actuate the Exhaust Gas Recirc Positioner to 100%.
Using a 12 volt test light connected to 12 volts, check the (K34) EGR
Solenoid Control circuit in the EGR Valve harness connector.
NOTE: The test light should be illuminated and bright. Compare
the brightness to that of a direct connection to the battery.
NOTE: The circuit will remain actuated by the controller for 30 sec-
onds. Be certain the actuation is active when checking the circuit.
Is the test light illuminated and bright?
Yes
>> Replace the EGR Valve in accordance with the Service
Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go to 6
6.
ENGINE CONTROL MODULE (ECM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Solenoid and
the Engine Control Module (ECM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Refer to any Technical Service Bulletins that may apply.
Were any problems found?
Yes
>> Repair as necessary.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Replace the Engine Control Module (ECM) in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
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