Passat Syncro Wagon V6-2771cc 2.8L DOHC (AHA) (1998)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Engine Coolant Temperature (ECT) Sensor, Checking
With Manufacturer's Scan Tool
Engine Coolant Temperature (ECT) sensor, checking
Special tools and equipment
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VAG1551 or VAG1552 Scan Tool (ST) with VAG1551/3 adapter cable
-
VAG1598/22 test box
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Multimeter US1119 (Fluke 83 or equivalent)
-
VW1594 connector test kit
-
Wiring diagram
Checking requirements
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Engine cold
NOTE: The Engine Control Module (ECM) will use the intake air temperature as a replacement value for an engine start (start temperature replacement
value) as soon as there is a Diagnostic Trouble Code (DTC) stored in DTC memory for the Engine Coolant Temperature (ECT) sensor -G62-. The
temperature then rises according to a program stored in the ECM. When the engine has reached normal operating temperature a fixed replacement value
will be displayed. This fixed value is also dependent upon the intake air temperature.
Checking
-
Connect VAG1551 or VAG1552 scan tool and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (with ignition switched;
engine not running.
Indicated on display
Rapid data transfer
HELP
Select function XX
-
Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
HELP
Input display group number XXX
-
Press buttons -0-, -0- and -4- to input display group number 4 (004), and press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
Read Measuring Value Block 4
->
1234
-
Compare display with specified value for engine coolant temperature sensor (display field 3):