Printed Circuit; Speed Sensor; Water Thermosensor; Fuel Gauge Sender Unit (In Fuel Tank) - Mazda MX-5 1990 Workshop Manual

T
INSTRUMENT CLUSTER
410
520
9MUOTX-087
~
0
O~~
O.;r
0
o~
oW
G
00 0
o
0
00
000
0 0 0
o
o
00
o
0
o
0
05UOTX-067
05UOTX-287
15.8 ±
0.60 ~~~===l
05UOTX-070
T-36
4. Set the SST to the resistance values shown in the figure.
5. Verify that the needle indicates the correct values.
Caution
• Continue the above checks for at least two minutes
each to correctly judge the condition.
• The allowable indication error is twice the width of
the needle.
PRINTED CIRCUIT
Inspection
-
1. Remove the instrument cluster. (Refer to page T -33.)
2. Check the printed circuit for damage or oxidization.
3. If necessary, replace the printed circuit.
SPEED SENSOR
Inspection
1 . Remove the instrument cluster.
2. Check continuity between terminals 2d and 2f while rotat-
ing the speedometer cable shaft.
3. If the correct number of pulsations fail to occur during each
shaft rotation, replace the speed sensor.
(Refer to page T -33.)
Pulsation: 4/shaft rotation
WATER THERMOSENSOR
Inspection
1. Remove the sensor.
2. Place the sensor and a thermometer in water.
3. Heat the water gradually, and measure the resistance of
the sensor with an ohmmeter.
4. If the resistance is not as specified, replace the sensor.
Resistance: 190-2600 at 50°C (122°F)
FUEL GAUGE SENDER UNIT (IN FUEL TANK)
Inspection
1. Remove the fuel tank gauge sender unit. (Refer to Section F.)
2. Disconnect the fuel gauge sender unit connector.
3. Check resistance between terminals a and b while slowly
moving the unit arm from pOint F to point E.
4. If not correct, replace the fuel gauge sender unit.