Dtc P0418 Secondary Air Injection System Control A Circuit

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
2Tr-Fbe Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (AIR PUMP ASSEMBLY - AIR INJECTION CONTROL DRIVER, AIR INJECTION CONTROL DRIVER - BATTERY)

INSPECT AIR PUMP ASSEMBLY

REPLACE AIR PUMP ASSEMBLY

CHECK WHETHER DTC OUTPUT RECURS

DTC P0418 Secondary Air Injection System Control "A" Circuit


DESCRIPTION

Refer to DTC P0412 (HILUX_TGN26 RM0000012FY035X_01.html).

DTC No.
DTC Detection Conditions
Trouble Areas
P0418
  1. After a cold engine start, all conditions are met (2 trip detection logic):
    1. Secondary air injection (AIR) system is not operating (air pump off, air switching valve off).
    2. Diagnostic signal from the air injection control driver is 20%.
    3. Battery voltage is 8 V or higher.
  1. Open in air pump drive circuit (air injection control driver - air pump assembly) or short between air pump drive circuit and +B or BATT
  2. Open in air injection control driver BATT circuit (air injection control driver power source)
  3. Harness and connector (air injection control driver - air pump assembly)
  4. Air pump assembly
  5. Air injection control driver
  6. ECM
P0418
  1. After a cold engine start, all conditions are met (2 trip detection logic):
    1. Secondary air injection (AIR) system is operating (air pump on, air switching valve on).
    2. Diagnostic signal from the air injection control driver is 20%.
    3. Battery voltage is 8 V or higher.
  1. Short between air pump drive circuit and body ground
  2. Open or in air injection control driver BATT circuit (air injection control driver power source)
  3. Harness and connector (air injection control driver - air pump assembly)
  4. Air pump assembly
  5. Air injection control driver
  6. ECM

MONITOR DESCRIPTION

The air injection control driver detects open and short circuits according to the voltages of the air pump terminal (VP) and the air switching valve terminal (VV), and transmits diagnostic information as a signal to the ECM.
For a short time after a cold engine start, the ECM transmits command signals to the air injection control driver to drive the air pump and air switching valve assembly.
The air injection control driver transmits an air pump malfunction signal to the ECM if either of the following conditions is met:
  1. The voltage at the air injection control driver terminal relating to the air pump is low despite the air injection control driver receiving command signals from the ECM to drive the air pump.
  2. The voltage at the air injection control driver terminal relating to the air pump is high despite the air injection control driver receiving no command signals from the ECM to drive the air pump.
The ECM stored the DTC based on diagnostic signals from the air injection control driver.

WIRING DIAGRAM

Refer to DTC P0412 (HILUX_TGN26 RM0000012FY035X_07.html).

INSPECTION PROCEDURE

HINT:
Diagnostic information output by the air injection control driver can be confirmed by connecting an oscilloscope to the diagnostic information terminal of the air injection control driver. Reading the waveform while performing the AIR system forced operation provided in the system check allows the possible trouble areas to be narrowed down.
  1. (a) Start the engine and warm it up.
  2. (b) Turn the ignition switch off.
  3. (c) Connect the intelligent tester to the DLC3.

  4. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System. Dtc P0418 Secondary Air Injection System Control A Circuit
    (d) Connect oscilloscope probes to the AIDI and E1 terminals of the ECM.
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)
  5. (e) Turn the ignition switch to ON and turn the intelligent tester on.
  6. (f) Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Manual Mode / AIR PUMP: ON, ASV: CLOSE.
    HINT:
    When Manual Mode is selected, the intelligent tester initialization (atmospheric pressure measurement) is performed automatically. The initialization takes 10 seconds. After the initialization, AIR PUMP and ASV operation can be selected.
  7. (g) Start the engine.
  8. (h) Perform the AIR system forced operation while the engine is idling.

  9. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System. Dtc P0418 Secondary Air Injection System Control A Circuit
    (i) Monitor the air injection control driver voltage output (duty ratio signal).
    Measurement Condition
    Item
    		Content
    ECM Terminal Name
    		AIDI - E1
    Tester Range
    		5 V/DIV., 20 ms/DIV.
    Condition
    		Idling
  10. (j) Turn the ignition switch off.
    NOTICE:
    1. Secondary Air Injection Check only allows technicians to operate the AIR 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 AIR system operation using the intelligent tester is prohibited, the intelligent tester display indicates the prohibition (Wait or Error).
      If Error is displayed on the intelligent tester 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 AIR 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 performing Secondary Air Injection Check operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch ON or the engine running.
    4. Turn the ignition switch off when the Secondary Air Injection Check operation finishes.
HINT:
  1. By using the intelligent tester 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 intelligent tester. 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, AIR INJECTION CONTROL DRIVER - BATTERY)

  1. Disconnect the cable from the negative (-) battery terminal.

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

  1. Disconnect the air pump connector.

  1. Disconnect the air injection control driver connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    A33 -2 - A34-2 (VP)
    		Always
    		Below 1 Ω
    A34-1 (BATT) - Positive battery terminal
    		Always
    		Below 1 Ω
    A33-1 - Body ground
    		Always
    		Below 1 Ω
Standard Resistance (Check for Short):
Tester Connection
Condition
Specified Condition
A33-2 or A34-2 (VP) - Body ground
Always
10 kΩ or higher

  1. Reconnect the air injection control driver connector.

  1. Reconnect the air pump connector.

  1. Reconnect the cable to the positive (+) battery terminal.

  1. Reconnect the cable to the negative (-) battery terminal.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.INSPECT AIR PUMP ASSEMBLY

  1. Inspect the air pump assembly (HILUX_TGN26 RM0000040K201DX.html).



NG
Go to step 3
OK

REPLACE AIR INJECTION CONTROL DRIVER (HILUX_TGN26 RM0000030JC029X.html)

3.REPLACE AIR PUMP ASSEMBLY

  1. Replace the air pump assembly (HILUX_TGN26 RM00000142T00HX.html).


NEXT


4.CHECK WHETHER DTC OUTPUT RECURS

  1. Start the engine and warm it up.

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the intelligent tester on.

  1. Clear DTCs (if stored)

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

  1. Start the engine after the intelligent tester initialization is finished.

  1. Perform the system check operation by pressing Next.

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

  1. Check 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 (HILUX_TGN26 RM0000030JC029X.html)
OK

END