With Manufacturer's Scan Tool

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







Special tools and equipment
- VAG 1526 A
- VAG 1594 A
- VAG 1598/31
- VAS5051 with VAS5051/1

Test requirements:
- Engine cold

Test sequence
- Connect testing and information system VAS5051 and select vehicle system "01 - Engine electronics". Engine must be running at idling speed. Connecting VAS 5051 Scan Tool

Display on VAS5051:







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

Display on VAS5051:







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

Display on VAS5051:







- Check indication in display field -3-.

Display Group 004:

If display zone 3 shows an implausible value:







- Disconnect connector -2- at Engine coolant temperature (ECT) gauge/Engine coolant temperature (ECT) sensor -G2-/-G62-.







- Connect multimeter between terminals degree C and D of sensor to measure resistance.

Range A shows resistance values for temperature range 0 to 50 degree C and range B shows the values for temperature range 50 to 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 coolant temperature sensor.

If specified value is obtained:
- Connect test box VAG 1598/31 to wiring harness for engine control module; do not connect engine control module. Connecting VAS 5051 Scan Tool







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

Connector Test box VAG 1598/31
terminal Socket
3 108
4 (signal) 93

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

If no wiring malfunction is detected:
- Replace engine control module.