With Manufacturer's Scan Tool

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







Special tools and workshop equipment required
- V.A.G 1526 A Multimeter
- V.A.G 1594 A Connector test kit
- V.A.G 1598/31 Test box
- VAS 5051 Vehicle diagnostic, testing and vehicle information system with VAS 5051/1 Adapter

Component location Figure 5.

Requirements
- Engine cold

Work 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.







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-.







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 to 2000 Ohms
- 80 degree C corresponds to a resistance of 275 to 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 ECM. Test Box, Connecting For Wiring and Component Test







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

Connector Test box V.A.G 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.