Dtc P144C Open In Secondary Air Injection System Heater Control Circuit

DESCRIPTION

MONITOR STRATEGY

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT AIR PUMP HEATER RELAY (AIR PMP HTR)

CHECK AIR PUMP HEATER RELAY (POWER SOURCE)

CHECK HARNESS AND CONNECTOR (ECM - AIR PUMP HEATER RELAY (AIR PMP HTR))

DESCRIPTION

MONITOR STRATEGY

CONFIRMATION DRIVING PATTERN

1. Connect the GTS to the DLC3.
   
2. Turn the ignition switch to ON and turn the GTS on.
   
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
   
4. Turn the ignition switch off and wait for at least 30 seconds.
   
5. Turn the ignition switch to ON and turn the GTS on.
   
6. Wait for 10 seconds.
   
7. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Air Pump Heater.
   
8. Activate the air pump heater for 10 seconds or more.
   

   HINT:

   1. The Active Test activates the air pump heater for up to 60 seconds.
      
   2. To protect the air pump heater, do not perform this test more than 4 times in a row.
      
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Code.
   
10. Read Pending DTCs.
    

    HINT:

    1. If a pending DTC is output, the system is malfunctioning.
       
    2. If a pending DTC is not output, perform the following procedure.
       
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
    
12. Input the DTC: P144C or P144D.
    
13. Check the DTC judgment result.
    
    

    GTS 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:

    1. If the judgment result shows NORMAL, the system is normal.
       
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
       

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. Inspect the fuses of circuits related to this system before performing the following inspection procedure.
   
2. After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work (LandCruiser RM000003YMD00TX.html).
   

HINT:

Read freeze frame data using the GTS. 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. Inspect the air pump heater relay (AIR PMP HTR) (LandCruiser RM000003BLB03PX_01_0019.html).
   

1. Remove the air pump heater relay (AIR PMP HTR).
   

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

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

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Air pump heater relay (AIR PMP HTR) terminal 2 - Battery positive (+) terminal	Always	Below 1 Ω
   Air pump heater relay (AIR PMP HTR) terminal 2 or Battery positive (+) terminal - Body ground	Always	10 kΩ or higher

1. Remove the air pump heater relay (AIR PMP HTR).
   

2. Disconnect the ECM connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Air pump heater relay (AIR PMP HTR) terminal 1 - G181-4 (HAI1)	Always	Below 1 Ω
   Air pump heater relay (AIR PMP HTR) terminal 1 or G181-4 (HAI1) - Body ground	Always	10 kΩ or higher