Dtc P144C Open In Secondary Air Injection System Heater Control Circuit

Engine Hybrid System. Land Cruiser. Urj200, 202 Grj200 Vdj200
1Gr-Fe Engine Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT AIR PUMP HEATER RELAY (AI-PMP HTR)

CHECK AIR PUMP HEATER RELAY (POWER SOURCE)

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

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 pump heater relay which causes the air pump heater to operate.

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

WIRING DIAGRAM

Refer to DTC P0412 (Click here).

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 PUMP HEATER RELAY (AI-PMP HTR)

  1. Inspect the air pump heater relay (AI-PMP HTR) (Click here).



NG
REPLACE AIR PUMP HEATER RELAY (AI-PMP HTR)
OK


2.CHECK AIR PUMP HEATER RELAY (POWER SOURCE)

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



    Land Cruiser. Urj200, 202 Grj200 Vdj200.1Gr-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 pump heater relay (AI-PMP HTR) terminal 2 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *1
    		Engine Room Relay Block
    *2
    		Air Pump Heater Relay (AI-PMP HTR)

  1. Reinstall the air pump heater relay (AI-PMP HTR).



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

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

  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 pump heater relay (AI-PMP HTR) terminal 1 - C45-61 (HAI1)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    Air pump heater relay (AI-PMP HTR) terminal 1 or C45-61 (HAI1) - Body ground
    		Always
    		10 kΩ or higher

  1. Reinstall the air pump heater relay (AI-PMP HTR).

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Click here)