Thermo King 098916, Maintenance Manual

Page: 181 / 196

Diagnosis: Troubleshooting, Status Messages, Alarm Codes
180
120 Suction Pressure Sensor
• Indicate a problem exists with this sensor or its
wiring. The sensor is reading out of the range, or
appears to be open or shorted
PTI Test
• Reading did not decease by 0.15 bar (2.175 psi)
between compressor on and off
Check wiring at J14 and J15 to be correct and
connected
Check J14 and J15 plugs are plugged into MRB
Check voltage at J15 pin12 to be 0.5 – 4.5 volts
Check cable No 1 and cable No. 3 between the
controller and MRB
121 Discharge Pressure Sensor
• Indicate a problem exists with this sensor or its
wiring. The sensor is reading out of the range, or
appears to be open or shorted
PTI Test
• Reading did not increase by 0.15 bar (2.175 psi)
between compressor on and off
Check wiring at J14 and J15 to be correct and
connected
Check J14 and J15 plugs are plugged into MRB
Check voltage at J14 pin11 to be 0.5 – 4.5 volts
Check cable No 1 and cable No. 3 between the
controller and MRB
122 CO2 Sensor Calibration Error
• Occurs during pretrip (PTI) test only
• Sensor reading is less < 17% or > 25%
Replace CO2 sensor
Alarm Codes, Descriptions and Corrective Actions (Continued)
Code Description Corrective Action