Coolant Temperature Gauge - Acura NSX 1997 Service Manual

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Coolant Temperature Gauge

Coolant Temperature Gauge Test
1. Before testing, check the No. 5 (15 A) fuse in the
under-dash fuse box.
2. Make sure the ignition switch is OFF, then discon-
nect the YEL/GRN wire from the coolant tempera-
ture gauge sending unit and ground it with a
jumper wire.
YEL/GRN
WIRE
3. Turn the ignition switch ON (II).
Check that the pointer of the coolant temperature
gauge starts moving toward the "H" mark. Turn the
ignition switch OFF before the pointer reaches the
"H" mark on the gauge dial; if you don't, you may
damage the gauge.
If the pointer of the gauge does not swing at all,
check for:
— An open in the YEL or YEL/GRN wire.
— Replace the coolant temperature gauge if the
fuse and wiring is OK.
If the coolant temperature gauge is OK, check the
sending unit.
Table of Contents
COOLANT TEMPERATURE
SENDING UNIT
Coolant Temperature Gauge ———
Sending Unit Test
1. Disconnect the YEL/GRN wire from the sending
unit, and with the engine cold, use an ohmmeter to
measure resistance between the positive terminal
and the engine (ground).
YEL/GRN
WIRE
2. Check the temperature of the coolant.
3. Run the engine, and measure the change in resis-
tance with the engine at operating temperature
(radiator fan comes on).
133°F (56°C)
Temperature
["C" mark]
Resistance
4. If the readings you get are substantially different
from the specifications above, replace the coolant
temperature gauge sending unit.
POSITIVE
TERMINAL
COOLANT TEMPERATURE
GAUGE SENDING UNIT
85°F (85°C) -
212°F (100°C)
142 49-32