DESCRIPTION Refer to DTC P04019C. Click here
 |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
MIL | Memory |
Note | | P040318 |
Exhaust Gas Recirculation "A" Circuit Current Below Threshold |
Open or short in EGR A circuit for 1 second or more (1 trip detection logic). |
- Open or short in EGR valve assembly circuit
- EGR valve assembly
- ECM
| Comes on |
DTC stored | SAE Code: P0489 | |
P040319 | Exhaust Gas Recirculation "A" Circuit Current Above Threshold |
Short in EGR A circuit for 1 second or more (1 trip detection logic). |
- Short in EGR valve assembly circuit
- EGR valve assembly
- ECM
| Comes on |
DTC stored | SAE Code: P0490 | |
P140018 | Exhaust Gas Recirculation "A" Control Circuit 2 Circuit Current Below Threshold |
Open or short in EGR B circuit for 1 second or more (1 trip detection logic). |
- Open or short in EGR valve assembly circuit
- EGR valve assembly
- ECM
| Comes on |
DTC stored | SAE Code: P0489 | |
P140019 | Exhaust Gas Recirculation "A" Control Circuit 2 Circuit Current Above Threshold |
Short in EGR B circuit for 1 second or more (1 trip detection logic). |
- Short in EGR valve assembly circuit
- EGR valve assembly
- ECM
| Comes on |
DTC stored | SAE Code: P0490 | MONITOR DESCRIPTION
These DTCs are stored if an open or short in the EGR valve assembly circuit is detected.
Example:
- If the EGA+, EGA-, EGB+ or EGB- operation signal is off, but the step
motor output signal is on, the ECM determines that there is a short in
the EGR valve assembly circuit, and stores a DTC P040319 or P140019.
- If the EGA+, EGA-, EGB+ or EGB- operation signal is on, and the step
motor output signal is off, the ECM determines that there is an open or
short in the EGR valve assembly circuit, and stores a DTC P040318 or
P140018.
MONITOR STRATEGY |
Related DTCs | P0489: EGR A circuit range check (low voltage)
P0489: EGR B circuit range check (low voltage) P0490: EGR A circuit range check (high current)
P0490: EGR B circuit range check (high current) | |
Required Sensors/Components (Main) | EGR valve assembly | |
Required Sensors/Components (Related) |
- | | Frequency of Operation |
Continuous | | Duration |
1 second | | MIL Operation |
Immediate | | Sequence of Operation |
None | TYPICAL ENABLING CONDITIONS All |
Both of the following conditions are met |
- | | Auxiliary battery voltage |
10.5 V or higher | |
Time after power switch off to on (IG) |
0.5 seconds or more | P0489: EGR A Circuit Range Check (Low Voltage) |
Exhaust gas recirculation control circuit motor phase A high current fail (P0490) |
Not detected | P0489: EGR B Circuit Range Check (Low Voltage) |
Exhaust gas recirculation control circuit motor phase B high current fail (P0490) |
Not detected | P0490: EGR A Circuit Range Check (High Current) |
Exhaust gas recirculation control circuit motor phase A low voltage fail (P0489) |
Not detected | P0490: EGR B Circuit Range Check (High Current) |
Exhaust gas recirculation control circuit motor phase B low voltage fail (P0489) |
Not detected | TYPICAL MALFUNCTION THRESHOLDS P0489: EGR A Circuit Range Check (Low Voltage) |
Either of the following conditions is met |
- | | Motor phase A positive terminal voltage detected by motor driver IC |
0.2 V or less | |
Motor phase A negative terminal voltage detected by motor driver IC |
0.2 V or less | P0489: EGR B Circuit Range Check (Low Voltage) |
Either of the following conditions is met |
- | | Motor phase B positive terminal voltage detected by motor driver IC |
0.2 V or less | |
Motor phase B negative terminal voltage detected by motor driver IC |
0.2 V or less | P0490: EGR A Circuit Range Check (High Current) |
One of the following conditions is met | - | |
Motor phase A positive terminal current detected by motor driver IC |
1.2 A or more | |
Motor driver MOSFET temperature for motor phase A positive terminal detected by motor driver IC |
150°C (302°F) or higher | |
Motor phase A negative terminal current detected by motor driver IC |
1.2 A or more | |
Motor driver MOSFET temperature for motor phase A negative terminal detected by motor driver IC |
150°C (302°F) or higher | P0490: EGR B Circuit Range Check (High Current) |
One of the following conditions is met | - | |
Motor phase B positive terminal current detected by motor driver IC |
1.2 A or more | |
Motor driver MOSFET temperature for motor phase B positive terminal detected by motor driver IC |
150°C (302°F) or higher | |
Motor phase B negative terminal current detected by motor driver IC |
1.2 A or more | |
Motor driver MOSFET temperature for motor phase B negative terminal detected by motor driver IC |
150°C (302°F) or higher | CONFIRMATION DRIVING PATTERN
HINT:
- After repair has been completed, clear the DTC and then check that the
vehicle has returned to normal by performing the following All Readiness
check procedure.
Click here
- When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG).
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for at least 30 seconds.
- Turn the power switch on (IG) [A].
- Turn the Techstream on.
- Put the engine in Inspection Mode (Maintenance Mode).
Click here
- Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
- With the engine running, drive the vehicle at 20 km/h (12 mph) or more for 10 minutes or more [C].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
If the engine stops, further depress the accelerator pedal to restart the engine.
- Enter the following menus: Powertrain / Engine / Trouble Codes [D].
- Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P040318, P040319, P140018 or P140019.
- Check the DTC judgment result.
|
Techstream Display |
Description |
|
NORMAL |
- DTC judgment completed
- System normal
|
|
ABNORMAL |
- DTC judgment completed
- System abnormal
|
|
INCOMPLETE |
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
|
HINT:
WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
HINT: Read
Freeze Frame Data using the Techstream. The ECM records vehicle and
driving condition information as Freeze Frame Data the moment a DTC is
stored. When troubleshooting, Freeze Frame Data can help determine if
the vehicle was moving or stationary, if the engine was warmed up or
not, if the air fuel ratio was lean or rich, and other data from the
time the malfunction occurred. PROCEDURE
| 1. |
PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) |
(a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG).
(c) Turn the Techstream on. (d) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
HINT: The A/C switch and all accessory switches should be off. (e)
Enter the following menus: Powertrain / Engine / Active Test / Control
the EGR Step Position / Data List / Intake Manifold Absolute Pressure,
Coolant Temperature and Engine Independent. Powertrain > Engine > Active Test
|
Active Test Display | |
Control the EGR Step Position |
|
Data List Display | |
Intake Manifold Absolute Pressure | |
Coolant Temperature | |
Engine Independent | (f)
Confirm that the value of Data List item Engine Independent is
"Operate" then check the value of Intake Manifold Absolute Pressure
while performing the Active Test.
NOTICE:
- Make sure that the value of Data List item Engine Independent is "Operate" while performing the Active Test.
- Do not leave the EGR valve open for 10 seconds or more during the Active Test.
- Be sure to return the EGR valve to step 0 when the Active Test is completed.
- Do not open the EGR valve 30 steps or more during the Active Test.
OK: The value of
Intake Manifold Absolute Pressure changes in response to the EGR step
position when the value of Engine Independent is "Operate". Standard: |
- | Control the EGR Step Position (Active Test) | |
0 Steps | 0 to 30 Steps | |
Intake Manifold Absolute Pressure (Data List) |
(EGR valve is fully closed) |
Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed |
HINT:
- If the value of Data List item Engine Independent is "Not Opr" when the
engine is idling, charge control is being performed. Perform the Active
Test after charge control is complete ("Operate" is displayed).
- While performing the Active Test, if the increase in the value of Intake
Manifold Absolute Pressure is small, the EGR valve assembly may be
malfunctioning.
- Even if the EGR valve assembly is malfunctioning, rough idling or an
increase in the value of Intake Manifold Absolute Pressure may occur
while performing the Active Test. However, the amount that the value of
Intake Manifold Absolute Pressure increases will be smaller than normal.
| OK |
 | CHECK FOR INTERMITTENT PROBLEMS |
|
NG |
 | |
| 2. |
INSPECT EGR VALVE ASSEMBLY | (a) Inspect the EGR valve assembly.
Click here HINT: Perform "Inspection After Repair" after replacing the EGR valve assembly.
Click here
| NG |
| REPLACE EGR VALVE ASSEMBLY |
|
OK | |
| |
| 3. |
CHECK HARNESS AND CONNECTOR (EGR VALVE ASSEMBLY - ECM) |
(a) Disconnect the EGR valve assembly connector. (b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
C45-1 (EGA+) - C55-3 (EGA+) |
Always | Below 1 Ω | |
C45-2 (EGA-) - C55-4 (EGA-) |
Always | Below 1 Ω | |
C45-4 (EGB+) - C55-6 (EGB+) |
Always | Below 1 Ω | |
C45-3 (EGB-) - C55-5 (EGB-) |
Always | Below 1 Ω | |
C45-1 (EGA+) or C55-3 (EGA+) - Body ground and other terminals |
Always | 10 kΩ or higher | |
C45-2 (EGA-) or C55-4 (EGA-) - Body ground and other terminals |
Always | 10 kΩ or higher | |
C45-4 (EGB+) or C55-6 (EGB+) - Body ground and other terminals |
Always | 10 kΩ or higher | |
C45-3 (EGB-) or C55-5 (EGB-) - Body ground and other terminals |
Always | 10 kΩ or higher |
| OK |
| REPLACE ECM |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR | |
