PRE-RELEASE
DTC P0404
| DTC P0404 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC P0404 03
Exhaust Gas Recirculation (EGR) Control Circuit Low Voltage
DTC P0404 0B
Exhaust Gas Recirculation (EGR) Control Circuit High Current
DTC P0404 51
Exhaust Gas Recirculation (EGR) Control Circuit Malfunction
DTC P0404 52
Exhaust Gas Recirculation (EGR) Control Circuit Malfunction
DTC P0404 55
Exhaust Gas Recirculation (EGR) Control Circuit Too Few Transitions
DTC P0404 56
Exhaust Gas Recirculation (EGR) Control Circuit Too Many Transitions
DTC P0404 59
Exhaust Gas Recirculation (EGR) Control Circuit Protection Time-Out
DTC P0404 5A
Exhaust Gas Recirculation (EGR) Control Circuit Not Plausible
DTC P0404 5B
Exhaust Gas Recirculation (EGR) Control Circuit Malfunction
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | 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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| 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 transferred to the EGR valve's solenoid valve. The ECM controls the solenoid valve by grounding the control circuit.
| 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 |
P0404 03
The voltage is below the calibrated value.P0404 0B
The ECM detects a high current on the output power stage.P0404 51, P0404 52, P0404 5A or P0404 5B
The ECM detects a positive or negative deviation of the EGR valve.P0404 55
The ECM detects a permanent negative governor deviation.P0404 56
The ECM detects a permanent positive governor deviation.P0404 59
The ECM detects a short circuit over load error.| Action Taken When the DTC Sets |
DTC P0404 is a Type B DTCs.
| Conditions for Clearing the DTC |
DTC P0404 is a Type B DTCs.
| Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
| 1. |
Ignition ON, observe the DTC information with a scan tool. Verify that no other DTCs are set.
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| 2. |
If any other DTCs are set, refer to
Diagnostic Trouble Code (DTC) List - Vehicle
for further diagnosis.
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| 3. |
DTCs P0403, P0489 or P0490 should not set.
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| 4. |
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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| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the Q14 Exhaust Gas Recirculation (EGR) Valve and K20 Engine Control Module.
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| 2. |
Test for greater than 500 kΩ between the low reference circuit terminal 2 and ground.
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| 3. |
If less than the specified range, test the low reference circuit for a short to ground.
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| 4. |
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 49 (X1) at the K20 Engine Control Module.
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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. |
Connect the harness connector X1 to the K20 Engine Control Module.
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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. |
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. |
If all circuits test normal, test or replace the Q14 Exhaust Gas Recirculation (EGR) Valve.
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| 10. |
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. |
If the DTC resets, replace the K20 Engine Control Module.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Exhaust Gas Recirculation Valve Replacement
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Vacuum Pump Assembly Replacement
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Engine Control Module Replacement
for ECM replacement, setup, and programming
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