New Holland T8010 Manual page 1037

Test
Confirm power output to heater valve: Pin E (5-pin) to Battery GND
Condition(s): Keyswitch and A/C Switch ON
3
Expected Result: 12V
Action: If no voltage, replace the controller.
Confirm control signal to heater control valve: Pin D (5-pin) to Battery GND
Condition(s): Keyswitch and A/C Switch ON
4
Expected Result: 1.5 to 11.5V while turning temperature control from max heat to max cool setting
Actions: If no voltage, replace the controller.
If no voltage change or drop out, test the pot. See Temperature Control Pot, page 79.
Test high pressure switch circuit: Pin C to Battery GND
Condition(s): Keyswitch and A/C Switch ON, disconnect harness to high pressure switch
5
Expected Result: 5V
Action: If no voltage, replace the controller. (Reconnect harness before continuing testing.)
Test low pressure switch circuit: Pin B (5-pin) to Battery GND
Condition(s): Keyswitch and A/C Switch ON, disconnect harness to low pressure switch
6
Expected Result: 5V
Action: If no voltage, replace the controller. (Reconnect harness before continuing testing.)
Test evaporator temperature sensor: Pin B to Battery GND
Condition(s): Keyswitch and A/C Switch ON
7
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, page 83.
Test controller switched ground to clutch relay: Pin A (5-pin) to chassis ground
Condition(s): Keyswitch ON
Expected Result: 0.0V or 12V, see actions.
8
Actions: A/C switch ON, with temperature control to max cool and normal pressures, 0.0V indicates
proper operation.
A/C switch OFF and keyswitch ON, 12V indicates proper operation; if no 12V, test relay
control circuit, page 86. If circuit tests normal, replace the controller.
Test temperature control output: Pin D to Battery GND
Condition(s): Keyswitch and A/C switch ON
9
Expected Result: 5V
Actions: If no voltage, replace the controller.
Test the pressure warning lamp circuit in A/C switch: Pin C (5-pin) to Battery GND
Condition(s): Keyswitch and A/C switch ON, disconnect harness to either pressure switch
Expected Result: 5V
10
Actions: If no voltage, test the A/C switch circuit; see page 87. If circuit and switch test normal, and
warning lamp does not blink with pressure switch harness disconnected, replace the
controller. (Reconnect harness before continuing tests.)
Test A/C switch control function: Pin E to Battery GND
Condition(s): Keyswitch ON
11
Expected Result: 5V with A/C OFF, 0.0V with A/C switch ON
Actions: Test the A/C switch circuit; see page 87. If circuit and switch test normal, but compressor
does not engage with proper request and conditions, replace the controller.
Section 50 - Climate Control - Chapter 1
Instructions and Actions
50-1-66