28-25
Engine Coolant Temperature
(ECT) sensor, checking
Notes:
To functionally check the Engine Coolant
Temperature (ECT) sensor Repair Group 01,
Read measuring value block, display group
001, display field 1.
Component locations page 28
-1 .
- Disconnect ECT sensor harness connector.
- Switch Fluke 83 multimeter to resistance range and measure between
ECT sensor terminals 1 (signal) and 3 (GND).
Specified values:
At approx. 20 C (68 F): approx. 2500 At approx. 80 C (176 F): approx. 330
Pa
ge 1 of 3 En
gine Coolant Tem
perature
(ECT
) sensor, checkin
g
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
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pair&id=AUDI.B5.FU01.28.7
28-26
If the specified values are not obtained: - Check wiring for continuity between terminal 3 of ECT sensor harness
connector and engine Ground (GND).
Specified value: max. 1 - Check signal wire for continuity between ECT sensor harness
connector terminal 1 and test box socket 16A.
Specified value: max. 1 - Check both wires for short circuit to each other.
If wiring is OK and the ECT sensor is OK: - Eliminate short or open circuit in wiring between ECT sensor and ECM
connector -A- or engine Ground (GND).
ECT sensor terminal
number ECM Connector A or engine Ground
(GND)
1 16A
3 Engine Ground (GND)
- Replace the ECM page 01
-265
.
Pa
ge 3 of 3 En
gine Coolant Tem
perature
(ECT
) sensor, checkin
g
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.28.7
