Fuel Gauge Does Not Operate - Mazda MX-5 1990 Workshop Manual

Preparation
SST
49 0839 285
Checker, fuel and
thermometer
330
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330
950
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INSTRUMENT CLUSTER
T
Symptom: Fuel gauge does not operate.
70
05UOTX-467
For inspection of
gauges
9MUOTX-079
05UOTX-284
05UOTX-285
05UOTX-052
Step 1
1 . Disconnect the connector from the fuel tank sender unit.
2, Connect the red lead of the SST to terminal-wire (Y) and
the black lead to a body ground.
3. Set the SST to the resistance values shown in the figure.
4. Turn the ignition switch ON, and verify that the needle indi-
cates the correct values.
Indicates correct Action
Yes Replace fuel gauge sender unit (in fuel tank)
No
Go to Step 2
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.
Step
2
1. Remove the instrument cluster. (Refer to page T -33.)
2. Apply 12V to terminal 2k and ground terminal 2j.
3. Connect the red lead of the SST to terminal 1 a and the black
lead to a ground.
4. Set the SST to the resistance values shown in the figure.
5. Verify that the needle indicates the correct values.
Indicates correct
Action
Yes
Repair wiring harness
(Instrument cluster - fuel gauge sender unit)
No Replace fuel gauge
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.
T-31