Test sequence

Connect VAS5051 tester or VAG1551 scan tool and select control module for engine electronics using "address word" 01. See VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM OR VAG1551 SCAN TOOL (ST), CONNECTING AND SELECTING FUNCTIONS .
Engine must run at idle for this.

When indicated on display:

Fig 1: Identifying Scan Tool Display - Checking Engine Coolant Temperature (ECT) Sensor (1 Of 3)

Press buttons -0- and -8- to select "Read Measuring Value Block" and press -Q- button to confirm input.

When indicated on display:

Fig 2: Identifying Scan Tool Display - Checking Engine Coolant Temperature (ECT) Sensor (2 Of 3)

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

Indicated on display:

Fig 3: Identifying Scan Tool Display - Checking Engine Coolant Temperature (ECT) Sensor (3 Of 3)

Check indication in display field 3.

DISPLAY FIELDS CHART

	Display fields
	1	2	3	4
Display group 004: Coolant temperature, engine at idle
Display	xxxx/min	xx.xxx V	xxx.x °C	xxx.x ° C
Indicated	Engine speed (RPM)	Battery voltage	Coolant temperature	Intake Air Temperature (IAT)
Functional range	670 to 6800 RPM	10.000 to 15.000 V	-48.0 to 143.0 ° C	-48.0 to 143.0 ° C
Specified value	xxxx/min	12.000 to 15.000 V	Temperature value must rise evenly	From ambient temperature up to 120 ° C

If display field 3 does not have a realistic indication:

NOTE: Intake air hose between Mass Air Flow (MAF) sensor and intake air elbow must be removed in order to be able to reach the coolant temperature sensor.

Disconnect connector at coolant temperature sensor.