Section 6 – SR-2 Service Procedure D03A
Diagnostic Procedure
Step Action
Result
Comments
1. Turn the unit on.
2. Access the Gauge submenu in
the Maintenance Menu and
display the suction pressure or
discharge pressure.
The display should show the
pressure reading for the sensor.
If the sensor reading is obviously
incorrect or the display shows
[ ---- ], proceed as shown below.
Confirm reading with refrigeration
gauges as necessary. If all
sensors show dashes [----]
without being disconnected, the
microprocessor or wiring harness
is defective.
3. Turn the unit off and disconnect
the suction or discharge pressure
transducer at the transducer plug.
4. Turn the unit on.
5. Check the voltage at the sensor
harness connector.
The voltage between wires DPN
and DPP (Discharge Pressure) or
SPN and SPP (Suction Pressure)
must be from 4.90 to 5.10 volts
DC. Check the microprocessor
using Service Procedure A01A.
6. Check the microprocessor as
shown in Service Procedure
A01A.
If the microprocessor fails the test
it must be replaced.
7. Check harness continuity of the
DPI or SPI wires.
If the voltage at Step 5 is present
and the DP or SP wire has
continuity, replace the sensor in
question.
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P41RD03A 30 January 2005
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