With Manufacturer's Scan Tool

Engine Coolant Temperature (ECT) Sensor -G62-, Checking







Special tools and workshop equipment required

- V.A.G 1526 A.
- V.A.G 1594 A.
- V.A.G 1598/31.
- VAS 5051 with VAS 5051/1.

Test requirements:

- Engine cold.

Test sequence

- Connect vehicle diagnostic, testing and information system VAS 5051 and select vehicle system "01 - Engine electronics" in selection. Engine must be run at idle. Scan Tool Connecting and Initial Checks

Display on VAS 5051:







- Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS 5051:







1 - Enter display group.
- Enter "004" for "display group number 004" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS 5051:







- Check Engine Coolant Temperature (ECT) sensor -G62- in display zone -3-.

Display Group 004:

If display zone 3 shows an implausible value:







- Disconnect Engine Coolant Temperature (ECT) sensor connector at -G2- / -G62- -arrow-.







- Connect multimeter between terminals C and D of sensor to measure resistance.
- Range A shows resistance values for temperature range 0...50 degree C and range B shows the values for temperature range 50...100 degree C.

Sample readings:







- 30 degree C corresponds to a resistance of 1500...2000 Ohms
- 80 degree C corresponds to a resistance of 275..375 Ohms

If specified value is not obtained:
- Replace Engine Coolant Temperature (ECT) sensor -G62-.

If specified value is obtained:
- Connect test box V.A.G 1598/31 to wiring harness for ECM; do not connect directly to the ECM.







- Check for open circuit, short to positive, or short to ground in following wiring connections:

Connector Test box VAG 1598/31
terminal Socket

3 108
4 (signal) 93

- Test for short circuits between two wires.
- Repair any open/short circuit as necessary.

If no wiring problems are found:
- Replace ECM.