DTC P0403, P0489, or P0490
Diagnostic Instructions
DTC Descriptors
| 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 |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Control
|
P0404 03, P0489 02, P0489 12
|
P0403 04
|
P0490 01, P0490 11
|
P0404 0B, P0404 51, P0404 52, P0404 52, P0404 5B, P0404 5A, P0404
56, P0404 55, P0404 59
|
Ground
|
—
|
—
|
—
|
—
|
|
| |
Circuit/System Description
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.
Conditions for Running the DTC
| • |
The ignition is ON, or the
engine is running. |
| • |
The DTCs run continuously when
the above conditions are met. |
Conditions for Setting the DTC
P0403
The ECM detects an open circuit when the EGR is commanded ON.
P0489
The ECM detects a short to earth when the EGR is commanded ON.
P0490
The ECM detects a short to voltage when the EGR is commanded ON.
Action Taken When the DTC Sets
DTC P0403, P0489 and P0490 are Type B DTCs.
Conditions for Clearing the DTC
DTC P0403, P0489 and P0490 are Type B DTCs.
Reference Information
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
Circuit/System Testing
| 1. |
Ignition OFF, disconnect the
harness connector at the Q14 Exhaust Gas Recirculation Valve and
K20 Engine Control Module. |
| 2. |
Test for greater than 500
kΩ between the low reference circuit terminal 2 and
ground. |
| ⇒ |
If less than the specified range, test the low
reference circuit for a short to ground. |
| 3. |
Test for less than 5 Ω
between the low reference circuit terminal 2 at the Q14 Exhaust Gas
Recirculation Valve and the low reference circuit terminal listed
below at the K20 Engine Control Module. |
| |
• |
LCD/LBX/LBS Terminal 49
X1 |
| ⇒ |
If greater than the specified range, test the low
reference circuit for an open/high resistance. |
| 4. |
Connect the harness connector
X1 to the K20 Engine Control Module. |
| 5. |
Ignition ON, test for greater
than 11 V between the control circuit terminal 6 and ground.
|
| ⇒ |
If less than the specified range, test the control
circuit for a short to ground or an open/high resistance. |
| 6. |
If all circuits test normal,
test or replace the Q14 Exhaust Gas Recirculation Valve.
|
| 7. |
Connect the harness connector
to the Q14 Exhaust Gas Recirculation Valve. Clear the DTC
information and operate the vehicle within the conditions for
running the DTC. |
| ⇒ |
If the DTC resets, replace the K20 Engine Control
Module. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
