Jetta Sedan L4-1.9L DSL Turbo (BEW) (2005)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Engine Coolant Temperature (ECT) Sensor, Checking
Recommended special tools and equipment
-
V.A.G1526 multimeter or V.A.G1715 multimeter
-
V.A.G1594 connector test kit
-
Wiring diagram
Test requirement
-
Engine must be cold.
-
The respective fuses of Diesel-Direct fuel injection system must be OK
-
Battery voltage must be at least 11.5 volts.
Function test
-
Connect diagnostic tester. See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/Diagnostic Tester,
Connecting
-
Switch ignition on.
-
Under address word 33, select "Diagnostic mode 1: Checking measured values."
-
Select the measuring value "PID 05: Coolant temperature".
-
Check specified value of coolant temperature:
If specified value is not obtained:
-
End diagnosis and switch ignition off.
-
Check wires according to wiring diagram.
If specified value is obtained:
-
Start engine and let run at idle.
-
Check specified value of coolant temperature at idle
NOTE:
-
The temperature increases in increments of 1.0 degrees C.
-
If the engine shows problems in certain temperature ranges and if the temperature does not climb uniformly, the temperature signal is
intermittent and the sensor should be replaced.
Checking wiring
-
Connect test box to control module wiring harness, connect test box for wiring test. See: Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Scan Tool Connecting/Test Box, Connecting For Wiring Test