DTC P0403, P0489, or P0490
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DTC P0403, P0489, or P0490
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DTC P0403 04
Exhaust Gas Recirculation (EGR) Control Circuit Open
DTC P0489 02
Exhaust Gas Recirculation (EGR) Motor Control Circuit Short to Ground
DTC P0489 12
Exhaust Gas Recirculation (EGR) Motor Control Circuit Low Input
DTC P0490 01
Exhaust Gas Recirculation (EGR) Motor Control Circuit Short to Battery
DTC P0490 11
Exhaust Gas Recirculation (EGR) Motor Control Circuit High Input
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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Control
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P0404 03, P0489 02, P0489 12
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P0403 04
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P0490 01, P0490 11
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P0404 0B, P0404 51, P0404 52, P0404 52, P0404 5B, P0404 5A, P0404 56, P0404 55, P0404 59
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Ground
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-
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-
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-
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-
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Circuit/System Description
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The exhaust gas recirculation (EGR) valve is controlled by the engine control module (ECM) through the EGR solenoid. A reference voltage is supplied to the EGR valve solenoid. The ECM controls the solenoid by grounding the control circuit.
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Conditions for Running the DTC
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The ignition is ON or the engine is running.
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The DTCs run continuously when the above conditions are met.
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Conditions for Setting the DTC
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P0403
The ECM detects an open circuit when the EGR is commanded ON.
P0489
The ECM detects a short to ground when the EGR is commanded ON.
P0490
The ECM detects a short to voltage when the EGR is commanded ON.
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Action Taken When the DTC Sets
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DTCs P0403, P0489 and P0490 are Type B DTCs.
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Conditions for Clearing the DTC
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DTCs P0403, P0489 and P0490 are Type B DTCs.
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Ignition ON, observe the DTC information with a scan tool. Verify that no other DTCs are set.
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3.
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DTCs P0403, P0489 or P0490 should not set.
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4.
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Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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1.
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Ignition OFF, disconnect the harness connector at the Q14 Exhaust Gas Recirculation (EGR) Valve and K20 Engine Control Module.
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2.
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Test for greater than 500 kΩ between the low reference circuit terminal 2 and ground.
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3.
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If less than the specified range, test the low reference circuit for a short to ground.
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4.
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Test for less than 5 Ω between the low reference circuit terminal 2 at the Q14 Exhaust Gas Recirculation (EGR) Valve and the low reference circuit terminal listed below at the K20 Engine Control Module.
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LCD/LBX/LBS Terminal 49 X1
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5.
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If greater than the specified range, test the low reference circuit for an open/high resistance.
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6.
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Connect the harness connector X1 to the K20 Engine Control Module.
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7.
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Ignition ON, test for greater than 11 V between the control circuit terminal 6 and ground.
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8.
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If less than the specified range, test the control circuit for a short to ground or an open/high resistance.
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9.
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If all circuits test normal, test or replace the Q14 Exhaust Gas Recirculation (EGR) Valve.
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10.
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Connect the harness connector to the Q14 Exhaust Gas Recirculation (EGR) Valve. Clear the DTC information and operate the vehicle within the conditions for running the DTC.
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11.
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If the DTC resets, replace the K20 Engine Control Module.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
