PRE-RELEASE
DTC P0405 or P0406
| DTC P0405 or P0406 |
| 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 P0405 00
Exhaust Gas Recirculation (EGR) Position Sensor Circuit Low Voltage
DTC P0406 00
Exhaust Gas Recirculation (EGR) Position Sensor Circuit High Voltage
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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5V Reference
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P0405 00
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P0405 00
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P0406 00
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-
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Signal
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P0405 00
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P0405 00
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P0406 00
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-
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Low Reference
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P0406 00
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-
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| Typical Scan Tool Data |
EGR Position Sensor
| Circuit | Short to Ground | Open | Short to Voltage |
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Operating Conditions:
Engine running
Parameter Normal Range: 0.98-4.98 V |
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5V Reference
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0 V
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0 V
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4.98 V
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Signal
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0 V
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0 V
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4.98 V
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Low Reference
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-
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4.8 V
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-
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| Circuit/System Description |
The engine control module (ECM) uses the exhaust gas recirculation (EGR) position sensor to determine the position of the EGR valve. The ECM sends a reference voltage through the 5 V reference circuit to the EGR position sensor. The ECM provides a voltage return path for the sensor through the low reference circuit. A variable voltage signal, based on the EGR valve position, is sent from the sensor to the ECM through the EGR position sensor signal circuit. If the ECM detects an EGR position sensor voltage that is less than or more than the normal operating range, DTC P0405 or P0406 sets.
| Conditions for Running the DTC |
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The ignition is ON.
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This DTC runs continuously when the above conditions are met.
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| Conditions for Setting the DTC |
P0405
The EGR position sensor voltage is less than 0.26 V for more than 1 s.P0406
The EGR position sensor voltage is more than 4.75 V for more than 3 s.| Action Taken When the DTC Sets |
DTCs P0405 and P0406 are Type B DTCs.
| Conditions for Clearing the DTC |
DTCs P0405 and P0406 are Type B DTCs.
| Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Exhaust Gas Recirculation (EGR) System Description
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
| Circuit/System Verification |
| 1. |
Ignition ON, observe the scan tool EGR Position Sensor parameter. The reading should be between 0.25-4.75 V.
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| 2. |
Run the vehicle within the Conditions for Running the DTCs. You may also operate the vehicle within the conditions that you have noted 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.
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| 2. |
Ignition OFF, test for less than 5 Ω between the low reference circuit terminal 3 and ground.
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| 3. |
If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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| 4. |
Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.
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| 5. |
If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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| 6. |
If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
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| 7. |
Verify the scan tool EGR Position Sensor parameter is less than 0.3 V.
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| 8. |
If greater than the specified range, test the signal circuit terminal 5 for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
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| 9. |
Install a 3 A fused jumper wire between the signal circuit terminal 5 and the 5 V reference circuit terminal 1. Verify the scan tool EGR Position Sensor parameter is greater than 4.8 V.
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| 10. |
If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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| 11. |
If all circuits test normal, test or replace the Q14 Exhaust Gas Recirculation (EGR) Valve.
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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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Control Module References
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