Acura Integra 1998 Service Manual page 1191

Engine Coolant Temperature (ECT) Gauge
Gauge Test
NOTE: Refer to page 23-123 for the wiring description of
the engine coolant temperature (ECT) gauge circuit dia-
gram.
1 . C h e c k t h e N o . 2 5 ( 7 . 5 A ) f u s e i n t h e u n d e r - d a s h
fuse/relay box before testing.
2. Make sure the ignition switch is OFF, then discon-
nect the YEL/GRN wire trom the ECT gauge send-
i n g u n i t a n d g r o u n d i t w i t h a j u m p e r w i r e .
YEL/GRN WIRE
SENDING UNIT
T u r n t h e i g n i t i o n s w i t c h O N ( l l ) .
Check that the pointer of the ECT gauge starts mov-
i n g t o w a r d t h e " H " m a r k .
CAUTION: Turn the ignition switch OFF before the
pointer reaches "H" on the gauge dial. Failure to do
so may damage the gauge.
a lf the pointer of the gauge does not move at all,
c h e c k l o r a n o p e n i n t h e Y E L o r Y E L / G R N w i r e .
lf the wires are OK, replace the ECT gauge.
a lf the ECT gauge works, test the ECT sending
u n r t .
ECT Sending Unit Test
Disconnect the YEL/GRN wire from the ECT send-
i n g u n i t .
With the engine cold, use an ohmmeter to measure
resistance between the positive terminal and the en-
g i n e ( g r o u n d ) .
Check the temperature ol the coolant.
Run the engine and measure the change in resistance
with the engine at operating temperature (the radi-
ator fan comes on).
5. It the obtained readings are substantially different
from the sDecifications above, replace the ECT send-
I n g u n r t .
POSITIVE TERMINAL
Temperature
1 3 3 o F ( 5 6 o C )
1 8 5 0 F ( 8 5 . C ) -
2 1 2 . F ( 1 0 0 ' C )
Resistance {O)
137
4 6 - 3 0
23-134