DESCRIPTION
Refer to DTC P040000.
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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). |
| 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). |
| 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). |
| 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). |
| 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:
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 |
Exhaust gas recirculation control circuit motor phase A high current fail (P0490) | Not detected |
Exhaust gas recirculation control circuit motor phase B high current fail (P0490) | Not detected |
Exhaust gas recirculation control circuit motor phase A low voltage fail (P0489) | Not detected |
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 |
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 |
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 |
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:
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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.
HINT:
Techstream Display | Description |
---|---|
NORMAL |
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ABNORMAL |
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INCOMPLETE |
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HINT:
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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(Select Powertrain in Health Check and then check the time stamp data.)
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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 |
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Control the EGR Step Position |
Data List Display |
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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:
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:
OK | CHECK FOR INTERMITTENT PROBLEMS |
|
2. | INSPECT EGR VALVE ASSEMBLY |
(a) Inspect the EGR valve assembly.
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HINT:
Perform "Inspection After Repair" after replacing the EGR valve assembly.
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NG | REPLACE EGR VALVE ASSEMBLY |
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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 |
---|---|---|
C71-1 (EGA+) - C88-3 (EGA+) | Always | Below 1 Ω |
C71-2 (EGA-) - C88-4 (EGA-) | Always | Below 1 Ω |
C71-4 (EGB+) - C88-6 (EGB+) | Always | Below 1 Ω |
C71-3 (EGB-) - C88-5 (EGB-) | Always | Below 1 Ω |
C71-1 (EGA+) or C88-3 (EGA+) - Body ground and other terminals | Always | 10 kΩ or higher |
C71-2 (EGA-) or C88-4 (EGA-) - Body ground and other terminals | Always | 10 kΩ or higher |
C71-4 (EGB+) or C88-6 (EGB+) - Body ground and other terminals | Always | 10 kΩ or higher |
C71-3 (EGB-) or C88-5 (EGB-) - Body ground and other terminals | Always | 10 kΩ or higher |
OK | REPLACE ECM |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |