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

Engine Coolant Temperature (ECT) sensor -G62, checking

- Connect Vehicle Diagnostic, Testing and Information System VAS5051 or VAG 1551 Scan Tool to vehicle and select engine electronics control module by entering address word "01", [1][2]Scan Tool Connecting and Initial Checks. When doing this the engine must be at idle.

Indicated on display


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -8- to select function "Read Measuring Value Block" and confirm entry with -Q- button.

Indicated on display

Read Measuring Value Block
Input display group number XXX

- Press buttons -0-, -0- and -4- to select "display group number 004" and confirm entry with -Q- button.

Indicated on display


Read Measuring Value Block 4 ->
1 2 3 4


- Check readout for coolant temperature sender in display field 3.







Testing wiring
- Switch ignition off.
- Disconnect harness connector from sensor.
- Connect VAG 1598/31 test box to wiring harness for engine control module. DO NOT connect to engine control module itself, Connecting VAG 1598/31 Test Box






- Check wiring from 4-pin connector to engine control module for open circuit or short circuit to B+ or Ground (GND).

4-pin connector on VAG 1598/31 test
wiring harness, socket box socket
3 108
4 93

Resistance in wiring: max. 1.5 Ohms

- Correct any open/short circuit as necessary.

If no wiring malfunction is detected:
- Replace Engine Coolant Temperature (ECT) Sensor -G62.
- Display readiness code, Readiness Code Reading. Readiness code must be generated if DTC memory was erased, Readiness Code, Generating