117
RTAA-IOM-3
Table 18
Diagnostics and Troubleshooting Chart (Continued)
DIAG. ACTIVE
CODE DIAGNOSTIC DESCRIPTION TYPE MODES CAUSE
1d3 Comp. Suction Temp. Sensor - CMR All a . Open or Short in sensor electrical
Circuit 1 circuitry.
1d4 Comp. Suction Temp. Sensor - CMR All a. Open or Short in sensor electrical
Circuit 2 circuitry.
1d7 Phase Reversal Protection Lost - CMR Compressor Energized to a. The phase reversal protection
Compressor A To Transition Command Compressor A has become
inoperative. The phase rotation
protection system failed to detect two
in a row of one of the four phase
circuit states; Phase reversal, Phase
Rotation OK, Phase A lost, Phase B
lost.
1d8 Phase Reversal Protection Lost - CMR Compressor Energized to Same as diagnostic 1d7.
Compressor B Transition Command
1d9 Phase Reversal Protection Lost - CMR Compressor Energized to Same as diagnostic 1d7.
Compressor C Transition Command
1dA Phase Reversal Protection Lost - CMR Compressor Energized to Same as diagnostic 1d7.
Compressor D Transition Command
1db Slaved EXV Elec. Drive Circuit - CMR On Demand and a. Wiring between the EXV and the UCM
Refrigerant Circuit I Pre-Start is “Open”. Check the
connector for proper termination.
b. EXV motor is faulty.
c. EXV drive circuits on Module 1U3 are
faulty
1dC Slaved EXV Elec. Drive Circuit CMR On Demand and Same as diagnostic 1db. Also refer to
Refrigerant Circuit 2 Pre-Start diagnostics 1A9 and 1AA.
412 1U1 Indicating IFW All The 1U1 Module has detected a loss of
1U2 Communications inter-processor communications from
the 1U2 Module.
413 1U1 Indicating MMR All The 1U1 Module has detected a loss of
1U3 Communications inter-processor communications from
the 1U3 Module.
414 1U1 Indicating CMR All The 1U1 Module has detected a loss of
1U4 Communications inter-processor communications from
the 1U4 Module.
415 1U1 Indicating CMR All The 1U1 Module has detected a loss of
1U5 Communications inter-processor communications from
the 1U5 Module.
416 1U1 Indicating CMR All The 1U1 Module has detected a loss of
1U6 Communications inter-processor communications from
the 1U6 Module.
417 1U1 Indicating CMR All The 1U1 Module has detected a loss of
1U7 Communications inter-processor communications from
the 1U7 Module.
418 1U1 Indicating CMR All The 1U1 Module has detected a loss of
1U8 Communications inter-processor communications from
the 1U8 Module.
431 1U3 Indicating MMR All The 1U3 Module has detected a loss of
1U1 Communications inter-processor communications from
the 1U1 Module.
434 1U3 Indicating CMR All The 1U3 Module has detected a loss of
1U4 communications inter-processor communications from
the 1U4 Module.
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