Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1UR-FE ENGINE CONTROL
INSPECT AIR PUMP HEATER RELAY (AI-PMP HTR)
CHECK AIR PUMP HEATER RELAY (AI-PMP HTR) (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 (AI-PMP HTR) 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). | Open or short in air pump heater relay circuit Air pump heater relay (AI-PMP HTR) ECM |
| P144D | Open or short in the air pump heater relay circuit for 5 seconds (1 trip detection logic). | Open or short in air pump heater relay circuit Air pump heater relay (AI-PMP HTR) ECM |
WIRING DIAGRAM
Refer to DTC P0412 ().
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) |
Inspect the air pump heater relay (AI-PMP HTR) ().
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| OK | |
| 2.CHECK AIR PUMP HEATER RELAY (AI-PMP HTR) (POWER SOURCE) |
Remove the air pump heater relay (AI-PMP HTR) .
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 Engine switch on (IG) 11 to 14 V
| *1 | Engine Room Relay Block |
| *2 | Air Pump Heater Relay (AI-PMP HTR) |
Reinstall the air pump heater relay (AI-PMP HTR) .
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| OK | |
| 3.CHECK HARNESS AND CONNECTOR (ECM - AIR PUMP HEATER RELAY (AI-PMP HTR)) |
Remove the air pump heater relay (AI-PMP HTR) .
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for RHD Tester Connection Condition Specified Condition Air pump heater relay (AI-PMP HTR) terminal 1 - C46-60 (HAI1) Always Below 1 Ω Air pump heater relay (AI-PMP HTR) terminal 1 or C46-60 (HAI1) - Body ground Always 10 kΩ or higher for LHD Tester Connection Condition Specified Condition Air pump heater relay (AI-PMP HTR) terminal 1 - C45-60 (HAI1) Always Below 1 Ω Air pump heater relay (AI-PMP HTR) terminal 1 or C45-60 (HAI1) - Body ground Always 10 kΩ or higher
Reinstall the air pump heater relay (AI-PMP HTR) .
Reconnect the ECM connector.
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| OK | ||
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