Passat L4-1.8L Turbo (AWM) (2004)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
With Manufacturer's Scan Tool
Engine Coolant Temperature (ECT) sensor, checking
Special tools and equipment
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V.A.G 1551 scan tool (or VAG 1552 mobile scan tool) with VAG 1551/3B cable
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VAG 1598/31 adapter cable
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VAG 1526 multimeter or VAG 1715 multimeter
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VAG 1594 connector test kit
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Wiring diagram
Test requirement
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Engine must be cold.
Test sequence
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Connect V.A.G 1551 scan tool (VAG 1552). Then switch ignition on and select the Engine Control Module (ECM) using address word 01.
(connecting scan tool and selecting ECM). Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1551 Scan
Tool", See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble
Codes/Scan Tool Connecting/With Manufacturer's Scan Tool/Connecting VAG 1551 Scan Tool
Indicated on display:
Rapid data transfer
HELP
Select function XX
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Press buttons -0- and -8- to select "Read measuring value block" function 08. Press -Q- button to confirm input.
Indicated on display:
Read measuring value block
HELP
Enter display group number XX
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Press buttons -0-, -0- and -4- to select "Display group number 4". Press -Q- button to confirm input.
Indicated on display: (1 to 4 - display fields)
Read measuring value block 4
->
1
2
3
4
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Read coolant temperature value in display field 3. Specification: approx. coolant temperature
If specified value is not obtained:
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Continue test according to the following table:
If specified value is obtained:
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Start engine and let run at idle. Temperature value must rise evenly
NOTE:
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The temperature climbs in increments of 1.0 °C.
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If the engine shows problems in certain temperature ranges and if the temperature does not climb uniformly, the temperature signal is
intermiffent and the sensor should be replaced.
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Press -> button.