Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Engine temperature (ECT) sensor, checkingRequirements
- engine cold
- VAG 1551 Scan tool connected
- start engine and let idle
- press 1 button to select operating mode "Rapid Data Transfer"
- display will appear as shown
- press 0 and 1 buttons to select address word "Engine Electronics"
- display will appear as shown
- press Q button to enter input
- press => button
- press 0 and 8 buttons to select 08 "Read test value block"
- press Q button to enter input
- display will appear as shown
- press 0 and 1 buttons to select display group 01
- display will appear as shown
- press Q button to enter input
- display will appear as shown
- observe display value in field 2
- engine temperature must be uniform and increase without interruption
- press => button
- press 0 and 6 buttons to select function 06 "Ending output"
- display will appear as shown
- press Q button to enter input
NOTE: If engine malfunctions occur during certain temperature ranges and the display value does not increase without interruption, temperature signal has been interrupted and the ECT sensor (G 62) must be replaced.
Resistance, checking
- switch OFF ignition
- disconnect ECT harness connector from blue ECT sensor
- switch Fluke 83 multimeter to resistance range
- connect multimeter to terminals of ECT sensor using jumper wires from VW 1594 adaptor kit
