WorksheetsHVAC Advanced Diagnosis (LV3)
Total questions: 20
Worksheet time: 10mins
A. General Topics:
Air is flowing from the defrost vents only. What can the technician do to isolate the concern?
Test the mode doors.
Test the evaporator sensor.
Check for restricted cabin air filter.
Replace the distribution box.
A. General Topics
A vehicle is brought in for clicking and popping noises heard during HVAC mode selection from the instrument area. After the concern is verified, what is the most likely cause of the findings?
Actuator gears stripped
Mode door loose
Recirculation door binding
Blower motor binding
A. General Topics
What would a technician use to diagnose the humidity sensor?
An infrared digital thermometer
An A/C recovery and recharging station
A scan tool and a steaming cup of hot water
An analog amperage meters
A. General Topics
How would a technician diagnosis the in-car temperature sensor?
Test the sensor with a scan tool and ultraviolet light
Measure the refrigerant pressure with an A/C recovery and recharging station
Test the resistance of the sensor with a digital multimeter
Perform a current draw test on the HVAC module
A. General Topics
What would the technician use to diagnose the sun load sensor?
A steaming cup of hot water
A temperature probes
A fluorescent lamp
An ultraviolet light
A. General Topics
What is the best way to diagnose the outlet temperature sensor?
Measure the current draw of the outlet temperature sensor.
Use an A/C recovery and recharging station to check A/C pressure.
Display the temperature sensor parameters on the scan tool.
View the pulse-width-modulated (PWM) signal.
A. General Topics
Which of the following components would most likely cause the A/C compressor clutch to disengage?
Restricted cabin air filter
Transmission temperature
Oxygen sensor temperature
Temperature blend air door with stripped gears
A. General Topics
A vehicle with an automatic temperature control (ATC) system has excessive moisture on the inside of the windshield. After the concern is verified, which components or system should the technician investigate?
Humidity sensor
Sun load sensor
Ambient air temperature sensor
Blend door actuators
A. General Topics
If a technician is replacing an automatic temperature control (ATC) module, which test ensures the mode door stop positions are detected?
The A/C Cool Down Test
The A/C Performance Test
The HVAC Actuator Calibration Test
The Heater Performance Test
A. General Topics
vehicle is brought in with a poorly performing A/C system. No DTCs are set. The technician suspects the in-car temperature aspirator. What is the next logical diagnostic step to take?
Check for a shorted aspirator thermistor sensor circuit.
Check for an open aspirator thermistor sensor circuit.
Measure the current draw of the aspirator motor.
Inspect the aspirator for debris or dirt accumulation.
B. Activity Based Questions
What is the best way to diagnose the component shown in the image?
Verify parameter readings compared to the temperature chart.
Use a scan tool and a steaming cup of hot water.
Measure the resistance of the sensor, using a digital multimeter.
Use a scan tool and an A/C recovery and recharging station.
B. Activity Based Questions
Two technicians are discussing how to test the blower motor circuit shown in this image. Technician A says, measure the PWM voltage signal at point C while rotating the fan speed switch through all the ranges. Technician B says, measured voltage at point B should remain constant in all fan speed switch positions. Who is correct?
Technician A only
Technician B only
Both Technician A and B
Neither Technician A nor B
B. Activity Based Questions
A technician is performing a resistance test on a blower motor resistor and measures O.L when the DMM leads are placed at terminals 5 and 7. What does this measurement indicate?
The blower motor will operate normally.
All blower motor speeds are inoperative.
The blower motor will be inoperative at low speed.
The blower motor will operate on high speed only.
B. Activity Based Questions
An ambient air temperature sensor has set a circuit high diagnostic trouble code (DTC). With the ambient sensor disconnected, the voltage measured at terminal A to ground is 5 volts. The resistance measured at terminal B to ground is 0 ohms. What do these measurements indicate?
A short to ground on the sensor signal circuit
The signal and ground circuits are shorted together
An open sensor
A shorted sensor
B. Activity Based Questions
A technician is testing a mode door actuator on a manual temperature control (MTC) system that only operates in one direction. With DMM leads placed at terminals 5 and 4 of the actuator, and the actuator commanded in both directions, the voltage is 12 volts in both directions. What do these readings indicate?
The mode door actuator is faulted.
The mode door driver circuit is open.
The mode door ground driver circuit is open.
The HVAC control module is faulted
Service Library Related Questions
On 2018 DS Ram 1500 Pickup with 5.7L V8 Hemi MDS VVT option, customer concern of intermittent A/C controller not working. Technician perform initial inspection found current DTC B210E-85-Battery Voltage High-Signal above allowable range. Which of the following selection best describe the possible cause in order to correct the customer concern?
Apply service bulletin # 24-010-18 HVAC updates
Reflash the PCM with updated software
Related charging system DTC present.
Replace the BCM and reprogram it with latest updated software
Service Library Related Questions
On 2018 DS Ram 1500 Pickup with 5.7L V8 Hemi MDS VVT option, which of the following selection best describe the procedures related to HVAC verification test?
HVAC Module Reflash / Reprogramming
HVAC A/C Compressor Calibration Test
HVAC DTC Diagnostic Test
HVAC Actuator Calibration Test
Service Library Related Questions
On 2018 WD Dodge Durango with 3.6L V6 24V VVT option, which of the following special tools prior to proceed with the A/C clutch coil removal?
A/C Snap Ring Pliers 9764 with HVAC Recovery Machine
A/C Snap Ring Pliers 9746 with HVAC Recovery Machine
A/C Snap Ring Pliers 9764 with wiTech scan tool
A/C Snap Ring Pliers 9746 with wiTech scan tool
Service Library Related Questions
On 2018 DS Ram 1500 Pickup with 5.7L V8 Hemi MDS VVT option, customer concern of the heater outlet air temperature cannot be adjusted with the temperature control on the A/C-heater control. Technician perform initial inspection found current DTC B11C3-00-Front Mode Door 1 Travel Range too small. Which of the following selection best describe the possible cause of this symptom?
Faulty blower motor system
Improper transmission cooler hose routing.
Inoperative, obstructed or improperly installed blend-air door.
Air in the refrigerant system
Service Library Related Questions
On 2018 DS RAM 1500 Pickup with 5.7L V8 Hemi MDS VVT option, which of the following selection is the primary LOP for performing evaporator temperature sensor replacement?
24355011 - Probe, temperature Front Unit
24355101 - Probe, temperature Front Unit
24355111 - Probe, temperature Front Unit
24355001 - Probe, temperature Front Unit
