DESCRIPTION
INSPECTION PROCEDURE
INSPECT INTAKE AIR DUCT
INSPECT EXHAUST AIR DUCT
INSPECT HEATER FUEL PUMP
REPLACE FUEL PUMP FILTER
DTC 052 Safety Time Exceeded
DESCRIPTION
DTC No. | DTC Detection Condition | Trouble Area |
052 |
A heater ignition failure is detected. |
Exhaust air duct
Intake air duct
Fuel pump filter
Heater fuel pump
Combustion heater assembly
|
INSPECTION PROCEDURE
1.INSPECT INTAKE AIR DUCT |
Inspect the intake air duct.
- Result:
Result | Proceed to |
There is no problem with the intake air duct. | A |
The intake air duct is clogged, or other problems are found. | B |
| CLEAN OR REPLACE INTAKE AIR DUCT |
|
|
2.INSPECT EXHAUST AIR DUCT |
Inspect the exhaust air duct.
- Result:
Result | Proceed to |
There is no problem with the exhaust air duct. | A |
The exhaust air duct is clogged, or other problems are found. | B |
| CLEAN OR REPLACE EXHAUST AIR DUCT |
|
|
3.INSPECT HEATER FUEL PUMP |
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester connection | Condition | Specified condition |
Q55-2 - Q55-1 | Always | 9 to 12 Ω |
Inspect heater fuel pump operation.
Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1, and check the pressure of the hose by hand.
- This inspection must be done quickly (within 10 seconds) to prevent damage to the heater fuel pump.
- OK:
- The pressure is applied to the hose.
4.REPLACE FUEL PUMP FILTER |
Replace the fuel pump filter with a normal one and check that the condition returns to normal.
- OK:
- The heater is ignited normally and it starts operating.
NG | |
| |
REPLACE COMBUSTION HEATER ASSEMBLY |
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LEXUS IS250, IS220d / GSE20 ALE20