DTC P0418 Secondary Air Injection System Control "A" Circuit |
for Preparation Click here
DESCRIPTION
Refer to DTC P0412 (Click here).DTC No. | DTC Detection Condition | Trouble Area |
P0418 | All conditions are met for 3 seconds or more while idling immediately after the engine is started (2 trip detection logic):
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P0418 | All conditions are met for 3 seconds or more while idling immediately after the engine is started (2 trip detection logic):
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MONITOR DESCRIPTION
This DTC indicates an open or short circuit in the circuit containing the air pump of the secondary air injection system. The air injection control driver performs diagnosis of the air pump assembly, emission control valve set and itself, and sends the results of this diagnosis to the ECM as a duty signal. When the ECM receives a signal indicating a malfunction in the air pump assembly, emission control valve set or air injection control driver assembly, it illuminates the MIL and stores a DTC.MONITOR STRATEGY
Related DTCs | P0418: Secondary air injection system air pump circuit range check (Bank 1) |
Required Sensors/Components (Main) | Air injection control driver assembly |
Required Sensors/Components (Related) | Air pump assembly |
Frequency of Operation | Once per driving cycle |
Duration | 3 seconds |
MIL Operation | 2 driving cycles |
Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
Monitor runs whenever following DTCs not stored | None |
Air pump | Operating |
Emission control valve | Operating |
Battery voltage | 8 V or higher |
Ignition switch | ON |
Starter | OFF |
Monitor runs whenever following DTCs not stored | None |
Air pump | Not operating |
Emission control valve | Not operating |
Battery voltage | 8 V or higher |
Ignition switch | ON |
Starter | OFF |
TYPICAL MALFUNCTION THRESHOLDS
Diagnostic signal duty ratio from air injection control driver | 11% or more, and 29% or less |
COMPONENT OPERATING RANGE
Diagnostic signal duty ratio from air injection control driver | 70% or more, and 90% or less when secondary air injection system operating. 0% when secondary air injection system not operating. |
CONFIRMATION DRIVING PATTERN
- NOTICE:
- This Secondary Air Injection Check only allows technicians to operate the secondary air injection system for a maximum of 5 seconds. Furthermore, the check can only be performed up to 4 times per trip. If the test is repeated, intervals of at least 30 seconds are required between checks. While secondary air injection system operation using the Techstream is prohibited, the Techstream display indicates the prohibition (WAIT or ERROR). If ERROR is displayed on the Techstream during the test, stop the engine for 10 minutes, and then try again.
- Performing Secondary Air Injection Check repeatedly may cause damage to the secondary air injection system. If it is necessary to repeat the check, leave an interval of several minutes between System Check operations to prevent the system from overheating.
- When Secondary performing the Secondary Air Injection Check operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned to ON or the engine running.
- Turn the ignition switch off when the Secondary Air Injection Check operation finishes.
- Start the engine and warm it up.
- Turn the ignition switch off.
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation) (Click here).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the Techstream on.
- Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air injection check / Automatic Mode.
- Start the engine after the Techstream initialization is finished.
- Perform the System Check operation by pressing ENTER (Next).
- Perform the following to confirm the secondary air injection system pending codes: Press ENTER (Exit).
- Check for pending DTCs.
- OK:
- No pending DTC is output.
- After Secondary Air Injection Check is completed, check All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
- Input the DTC: P0418.
- 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
N/A - Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
- HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- DTC judgment completed
- If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (Click here).
- HINT:
- If no permanent DTC is output, the system is normal.
- If a permanent DTC is output, the system is malfunctioning.
- Turn the ignition switch off.
WIRING DIAGRAM
Refer to DTC P0412 (Click here).INSPECTION PROCEDURE
- NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- HINT:
- By using the Techstream to perform the Secondary Air Injection Check operation in the System Check, the air-fuel ratio and the pressure in the secondary air injection system passage can be checked while the secondary air injection system is operating. This helps technicians to troubleshoot the system when it malfunctions.
- Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. 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.
1.CHECK HARNESS AND CONNECTOR (AIR PUMP ASSEMBLY - AIR INJECTION CONTROL DRIVER ASSEMBLY, BATTERY AND BODY GROUND) |
Disconnect the air pump assembly connector.
Disconnect the air injection control driver assembly connector.
Disconnect the cable from the positive (+) battery terminal.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition D88-2 - D86-2 (VP) Always Below 1 Ω D86-1 (BATT) - positive (+) battery terminal Always Below 1 Ω D88-1 - Body ground Always Below 1 Ω D88-2 or D86-2 (VP) - Body ground Always 10 kΩ or higher D86-1 (BATT) or positive (+) battery terminal - Body ground Always 10 kΩ or higher
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OK | |
2.INSPECT AIR PUMP ASSEMBLY |
Inspect the air pump assembly (Click here).
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OK | ||
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3.REPLACE AIR PUMP ASSEMBLY |
Replace the air pump assembly (Click here).
NEXT | |
4.CHECK WHETHER DTC OUTPUT RECURS (DTC P0418) |
Start the engine and warm it up.
Turn the ignition switch off.
Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Clear the DTCs (if stored) (Click here).
Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air injection check / Automatic Mode.
Start the engine after the Techstream initialization is finished.
Perform the System Check operation by pressing Next.
After operating the secondary air injection system, perform the following to confirm the secondary air injection system pending codes: Press the Exit button.
Check for pending DTCs.
- OK:
- No pending DTC is output.
Turn the ignition switch off.
- NOTICE:
- When performing the Secondary Air Injection Check operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned to ON or the engine running.
- Turn the ignition switch off when the Secondary Air Injection Check operation finishes.
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OK | ||
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