New Holland T8010 Manual page 1001

Test
Test ground continuity to controller: Pin 18 to HVAC ground
Condition(s): ATC Switch OFF
1
Expected Result: Less than 1 ohm
Action: Restore clean ground and retry the unit.
Confirm switched B+ is present at controller: Pin 17 to Battery GND
Condition(s): Keyswitch ON
2
Expected Result: 12V
Action: Restore 12V and retry the unit. See Controller Power Supply and Ground Test in this Section.
Confirm power output to heater valve/mode door motor: Pin 8 to Battery GND
Condition(s): Keyswitch ON and ATC Switch to "AUTO"
3
Expected Result: 12V
Action: If no voltage, replace the controller.
Confirm control signal to heater control valve: Pin 3 to Battery GND
Condition(s): Keyswitch ON and ATC Switch to "AUTO"
4
Expected Result: 11.5 to 1.5V while turning temperature control from max cool to max heat setting
Actions: If no voltage, replace the controller.
If no voltage change or drop out, test the pot circuit. See Temperature Control Pot testing.
Confirm control signal to blower speed driver: Pin 5 to Battery GND
Condition(s): Keyswitch ON and ATC Switch to "AUTO"
5
Expected Result: 11.5 to 1.5V while turning blower speed control from full CCW to full CW
Actions: If no voltage, replace the controller.
If no voltage change, test the pot circuit. See Blower Speed Pot testing.
Confirm control signal to mode door motor: Pin 7 to Battery GND
Condition(s): Keyswitch ON and ATC Switch to "AUTO"
6
Expected Result: 0.0 to 5.0V while turning mode door control from full CCW to full CW
Actions: If no voltage, replace the controller.
If no voltage change, test the pot circuit. See Mode Door Pot testing.
Test high pressure switch circuit: Pin 33 to Battery GND
Condition(s): Keyswitch ON and Defog/Defrost Switch to ON; disconnect harness to high pressure
7
switch
Expected Result: 5V
Action: If no voltage, replace the controller. (Reconnect harness if continuing testing.)
Test low pressure switch circuit: Pin 35 to Battery GND
Condition(s): Keyswitch ON and Defog/Defrost Switch to ON, disconnect harness to low pressure
8
switch
Expected Result: 5V
Action: If no voltage, replace the controller. (Reconnect harness if continuing testing.)
Test evaporator temperature sensor: Pin 23 to Battery GND
Condition(s): Keyswitch ON and ATC Switch to "AUTO "
9
Expected Result: 0.5V at 70°F (21°C) at the sensor. Voltage decreases as temperature increases.
Actions: If no voltage, replace the controller.
If voltage out of range for temperature, test sensor. See sensor test.
Section 50 - Climate Control - Chapter 1
CONNECTOR J8 TEST POINTS
Instructions and Actions
50-1-30