Deck 40: On-Board Diagnosis

Question 1

Technician A says that the first step in the diagnostic process is to verify the problem (concern). Technician B says the second step is to perform a thorough visual inspection. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B

Answer 1

The steps in the diagnostic process are as follows:
1. The first step in the diagnostic process is to verify the concern problem. The verification in the first step is very necessary so that in the processes to follow, no further problem is faced.
2. The second step in the diagnosis process is to perform a complete and overall inspection. The complete and thorough inspection is required to inspect the overall system functioning in the diagnosis process.
So, according to the above mentioned context, both the technicians are correct.
Hence, the correct option is
.

Question 2

Explain the procedure to follow when diagnosing a vehicle with stored DTCs using a scan tool.

Answer 2

The procedures to follow when diagnosing a vehicle in accordance with the stored diagnostic trouble codes (DTCs) are as follows:
1. The engine coolant temperature (ECT) is equal to the intake air temperature (IAT) after the vehicle sits for a period of time.
2. The idle air control (IAT) valve is being commanded and is employed to an acceptable range in accordance with the specified positions.
3. The oxygen sensor
must be operating properly. The case can be when the reading is below
at times, the reading is above 800 mV, or the rapid transition between rich and lean.
The reading should be recorded as per the comparison between the obtained reading and the required reading. The necessary amendments should be made in accordance with the specified conditions. The required result or reading must be within the specified and acceptable range.

Question 3

Which item is not important to know before starting the diagnosis of an engine performance problem?

A) List of previous repairs
B) The brand of engine oil used
C) The type of gasoline used
D) The temperature of the engine when the problem occurs

Answer 3

While starting the diagnosis of the engine performance, the points of consideration are as follows:
1. The update list of the previous repairs record is of utmost importance since they provide the basis of the next recordings
2. The quality as well as the brand of the engine oil used for the specified usage. The quality of the engine oil helps to estimate the proper functioning as well as the efficiency of the engine.
3. The type or the variety of the gasoline being employed for the various purposes.
Hence, according to the above mentioned context, the temperature of the engine in the midst of the problem occurring doesn't hold true for the points under consideration. Hence seems irrelevant in accordance with the above mentioned context.
Hence, the correct option is
.

Question 4

Discuss what the PCM does during a drive cycle to test emission-related components.

Question 5

A paper test can be used to check for a possible problem with _____________.

A) The ignition system (bad spark plug wire)
B) A faulty injector on a multiport engine
C) A burned valve
D) All of the above

Question 6

Explain the difference between a type A and type B OBD-II diagnostic trouble code.

Question 7

Which step should be performed last when diagnosing an engine performance problem?

A) Checking for any stored diagnostic trouble codes
B) Checking for any technical service bulletins (TSBs)
C) Performing a thorough visual inspection
D) Verify the repair

Question 8

List three things that should be checked as part of a thorough visual inspection.

Question 9

Technician A says that if the opposite DTC can be set, the problem is the component itself. Technician B says if the opposite DTC cannot be set, the problem is with the wiring or grounds. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B

Question 10

List the eight-step funnel diagnostic procedure.

Question 11

The preferred method to clear diagnostic trouble codes (DTCs) is to _____________.

A) Disconnect the negative battery cable for 10 seconds
B) Use a scan tool
C) Remove the computer (PCM) power feed fuse
D) Cycle the ignition key on and off 40 times

Question 12

Explain why a bulletin search should be performed after stored DTCs are retrieved.

Question 13

Which is the factory scan tool for Chrysler brand vehicles equipped with CAN?

A) Star Scan
B) Tech 2
C) NGS
D) Master Tech

Question 14

List the three methods that can be used to reprogram a PCM.

Question 15

Technician A says that reprogramming a PCM using the J2534 system requires a factory scan tool. Technician B says that reprogramming a PCM using the J2534 system requires Internet access. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B

Question 16

Technician A says that knowing if there are any stored diagnostic trouble codes (DTCs) may be helpful when checking for related technical service bulletins (TSBs). Technician B says that only a factory scan tool should be used to retrieve DTCs. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B

Question 17

Which method can be used to reprogram a PCM?

A) Remote
B) Direct
C) Off-board
D) All of the above