Dtc P144C Open In Secondary Air Injection System Heater Control Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT AIR PMP HTR RELAY

CHECK AIR PMP HTR RELAY (POWER SOURCE)

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

DTC P144C Open in Secondary Air Injection System Heater Control Circuit

DTC P144D Short in Secondary Air Injection System Heater Control Circuit


DESCRIPTION

The ECM operates the AIR PMP HTR relay which causes the air pump heater to operate.

DTC No.
DTC Detection Condition
Trouble Area
P144C
Open or short in the AIR PMP HTR relay circuit for 5 seconds (1 trip detection logic).
  1. Open or short in AIR PMP HTR relay circuit
  2. AIR PMP HTR relay
  3. ECM
P144D
Open or short in the AIR PMP HTR relay circuit for 5 seconds (1 trip detection logic).
  1. Open or short in AIR PMP HTR relay circuit
  2. AIR PMP HTR relay
  3. ECM

WIRING DIAGRAM

Refer to DTC P0412 (LandCruiser RM0000012FY05WX_07.html).

INSPECTION PROCEDURE

NOTICE:
Inspect the fuses of circuits related to this system before performing the following inspection procedure.
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 AIR PMP HTR RELAY

  1. Inspect the AIR PMP HTR relay (LandCruiser RM000003BLB03QX_01_0013.html).



NG
REPLACE AIR PMP HTR RELAY
OK


2.CHECK AIR PMP HTR RELAY (POWER SOURCE)

  1. Remove the AIR PMP HTR relay.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System. Dtc P144C Open In Secondary Air Injection System Heater Control Circuit

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    AIR PMP HTR relay terminal 1 - Body ground
    		Engine switch on (IG)
    		11 to 14 V
    Text in Illustration
    *1
    		Engine Room Relay Block
    *2
    		AIR PMP HTR Relay

  1. Reinstall the AIR PMP HTR relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (ECM - AIR PMP HTR RELAY)

  1. Remove the AIR PMP HTR relay.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    AIR PMP HTR relay terminal 2 - G56-30 (HAI1)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    AIR PMP HTR relay terminal 2 or G56-30 (HAI1) - Body ground
    		Always
    		10 kΩ or higher

  1. Reinstall the AIR PMP HTR relay.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (LandCruiser RM00000329203TX.html)