DTC    P0418    Secondary Air Injection System Control "A" Circuit

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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):
  1. Secondary air injection system is not operating (the air pump and emission control valve are off).
  2. Diagnostic signal from the air injection control driver has a duty cycle of 20% (this indicates an open in the air pump circuit).
  3. Battery voltage is 8 V or higher.
  1. Open in air pump drive circuit
  2. Air pump assembly
  3. Air injection control driver assembly
  4. ECM
P0418
All conditions are met for 3 seconds or more while idling immediately after the engine is started (2 trip detection logic):
  1. Secondary air injection system is operating (the air pump and emission control valve are on).
  2. Diagnostic signal from the air injection control driver has a duty cycle of 20% (this indicates a short in the air pump circuit).
  3. Battery voltage is 8 V or higher.
  1. Short between air pump drive circuit and body ground
  2. Air pump assembly
  3. Air injection control driver assembly
  4. ECM

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


Case 1 
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

Case 2 
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:
  1. 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.
  2. 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.
  3. 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.
  4. Turn the ignition switch off when the Secondary Air Injection Check operation finishes.
  1. Start the engine and warm it up.
  2. Turn the ignition switch off.
  3. Connect the Techstream to the DLC3.
  4. Turn the ignition switch to ON.
  5. Turn the Techstream on.
  6. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation) (Click here).
  7. Turn the ignition switch off and wait for at least 30 seconds.
  8. Turn the ignition switch to ON and turn the Techstream on.
  9. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air injection check / Automatic Mode.
  10. Start the engine after the Techstream initialization is finished.
  11. Perform the System Check operation by pressing ENTER (Next).
  12. Perform the following to confirm the secondary air injection system pending codes: Press ENTER (Exit).
  13. Check for pending DTCs.

    OK:
    No pending DTC is output.
  14. After Secondary Air Injection Check is completed, check All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  15. Input the DTC: P0418.
  16. Check the DTC judgment result.

    Techstream Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    N/A
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:
    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
  17. 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:
    1. If no permanent DTC is output, the system is normal.
    2. If a permanent DTC is output, the system is malfunctioning.
  18. 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:
  1. 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.
  2. 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)

  1. Disconnect the air pump assembly connector.

  1. Disconnect the air injection control driver assembly connector.

  1. Disconnect the cable from the positive (+) battery terminal.

  1. 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


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.INSPECT AIR PUMP ASSEMBLY

  1. Inspect the air pump assembly (Click here).



NG
Go to step 3
OK

REPLACE AIR INJECTION CONTROL DRIVER ASSEMBLY (Click here)  

3.REPLACE AIR PUMP ASSEMBLY

  1. Replace the air pump assembly (Click here).


NEXT


4.CHECK WHETHER DTC OUTPUT RECURS (DTC P0418)

  1. Start the engine and warm it up.

  1. Turn the ignition switch off.

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON and turn the Techstream on.

  1. Clear the DTCs (if stored) (Click here).

  1. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air injection check / Automatic Mode.

  1. Start the engine after the Techstream initialization is finished.

  1. Perform the System Check operation by pressing Next.

  1. After operating the secondary air injection system, perform the following to confirm the secondary air injection system pending codes: Press the Exit button.

  1. Check for pending DTCs.

    OK:
    No pending DTC is output.

  1. Turn the ignition switch off.

    NOTICE:
    1. 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.
    2. Turn the ignition switch off when the Secondary Air Injection Check operation finishes.


NG
REPLACE AIR INJECTION CONTROL DRIVER ASSEMBLY (Click here)
OK

END