Check Cab Temp Sensor
refrigeration
Description
The cab air temperature sensor is out of range, and the unit uses Return Air Temperature for temperature control in Engine and Shore Power Operation.
Activation Conditions
Cab Air Temperature Sensor (CAT) is not within the range of -53° to +158°F (-47° to +70°C).
Unit Behavior
Engine and Shore Power Operation (Alarm only). Return Air Temperature (RAT) will be used for temperature control.
Reset Conditions
Auto reset when Cabin Air Temperature is in range or alarm may be manually reset from the alarm menu in the Aspen Interface, or by turning the unit off and then back on again.
Corrective Actions
1. Check Sensor a. Inspect sensor and connector. Verify there is no damage to sensor, and no damage, moisture, or corrosion in connector. b. Check Cabin Air Temperature Sensor resistance. 10,000 Ohms @ 77°F (25°C.) See Table 8–3 for complete table of temperatures and resistance values. 2. Check Sensor Wiring a. Inspect connector pins and terminals at sensor and connector J11-5 and J11-2. 10.2) Verify there is no physical damage to harness, and no damage, moisture, or corrosion in connectors. b. Disconnect sensor from harness. Check for 3.0 ± 0.1 VDC volts at harness plug between pins. This verifies CCM output and wiring connections to sensor.