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22101 SENSOR INPUT VOLTAGE LOW INP1
This alarm is an indication that there is a short in the transducer or DC current transformer wiring and
the voltage supply in the main microprocessor is overloaded.
• ACTIVATION: Voltage from main microprocessor to the components is less than 4.5 VDC.
• UNIT CONTROL: Alarm only.
• RESET CONDITION: Auto reset when voltage is correct, alarm reset or alarm may be manually reset by
turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (See Note 1 in Notes Section.) Operate the unit through the appropriate modes to see if any active
alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1. Check System Pressures
Install manifold gauge set and check and compare compressor discharge, evaporator outlet & suction
pressures with those shown in Unit Data. Refer to Section 8.7.11 for instruction on comparison.
2. Check Wiring
If a transducer reading is not within a reasonable range of gauge reading, check wires to sensors for
short.
• For CSP, check wiring from 2MM-20, 2MM-30 and 2MM-9.
• For EVOP, check wiring from 2MM-25, SP-20 and 2MM-17.
• For CDP, check wiring from 2MM-21, SP-20 and 2MM-10.
• For ECOP, check wiring from 2MM-28, SP-20 and 2MM-14.
3. Check CT Wiring - Check wires to sensor for short. Check wiring from 2MM-29, 2MM-12 and 2MM-23 to
PCM.
4. Replace Main Microprocessor - Download data and replace main microprocessor. For complete Main
Microprocessor Module replacement instructions refer to Section 5.5.2.
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