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Symptom - Gauge passes initialization, but is inaccurate in actual use; pointer stays
at 7:00 and its red LED is on; false warning message.
Probable Cause - Defective Interface Module or gauge.
Procedure: (see Figure 5-6)
1. With the ignition off, unplug 10-pin connector J3 from the Interface Module.
2. Switch the ignition on.
3. Use a voltmeter to measure the DC voltage between harness connector J3 pins A
(+12V from ignition) and K (ground). Note the reading for future reference.
4. Switch the ignition off, then reconnect J3.
5. Switch the ignition on and look at the voltmeter gauge.
6. If the voltmeter gauge does not read about the same as the voltage measured ear-
lier, or if it does not read at all, connect the HDT to the private data bus and com-
pare its reading to the suspect gauge's reading.
a.
If the readings are about the same, replace the Interface Module.
b. If the readings are different, replace the gauge.
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