DTC P0404
Diagnostic Instructions
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
|
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
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 DTC.
Conditions for Clearing the DTC
DTC P0404 is a Type B DTC.
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 Verification
1. |
Ignition ON, observe the DTC
information with a scan tool. Verify that no other DTCs are
set. |
2. |
DTCs P0403, P0489 or P0490
should not set. |
3. |
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. |
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
earth. |
⇒ |
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 49 X1 at
the K20 Engine Control Module. |
⇒ |
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.
|