Ch. 88 Scan Tools & Engine Performance Diagnosis
Most vehicle manufacturers recommend using ________ to clear DTCs.
A scan tool
Which of the following is least likely to be true about on-board diagnostics-II (OBD-II) active tests?
A type B diagnostic trouble code is emission-related and will cause the malfunction indicator lamp (MIL) to be turned on at the first trip if the computer has detected a problem.
Technician A says that the first step in diagnostic process is to verify the problem (concern). Technician B says the second step is to perform a thorough inspection. Which technician is correct?
Both technicians A & B
Technicians diagnosing a car with an aftermarket scan tool find that they cannot clear the stored diagnostic trouble codes (DTCs) with the scan tool. Technician A suggests removing the negative terminal to the battery as the next step to clear the codes. Technician B suggests disconnecting the fuses to the computer as the next step to clear the codes. In this scenario, which of the following statements is correct?
Both technician A's and B's assessments are accurate.
Bi-directional control allows a scan tool to control the vehicle's ________.
Door locks, On-board computer, & Transmission
The vehicle "Check Engine" light will illuminate if the vehicle has a(n) ________ related problem.
Emissions
Which of the following is least likely to be true of factory scan tools?
Factory scan tools are designed to function on more than one brand of vehicle.
Which of the following is least likely to be true about factory scan tools?
Factory scan tools work with multiple brands of vehicles.
A self-test automatic readout (STAR) tester is the best tool to use during the troubleshooting of a ________.
Ford vehicle
Which of the following types of programming allows a technician to program emissions-related electronic control modules (ECM) of all vehicle brands using a single tool?
J2534 programming
A vacuum leak causes the engine to run with a ________ air/fuel mixture.
Lean
Which is the factory scan tool for Chrysler brand vehicles equipped with CAN?
Master Tech
Which method can be used to reprogram a PCM?
Remote, direct, and off-board
Which of the following is true about reprogramming a powertrain control module (PCM) chip?
Reprogramming a powertrain control module (PCM) can be done by downloading new calibration files from a personal computer (PC) onto the PCM's memory.
What does verification of repairs involve?
checking for and clearing all diagnostic trouble codes (DTCs)
Which of the following procedures for resetting the powertrain control module (PCM) is least recommended by vehicle manufacturers?
disconnecting the battery
The preferred method to clear diagnostic trouble codes (DTCs) is to ____.
Use a scan tool
Which step should be performed last when diagnosing an engine performance problem?
Verify the repair
Which of the following is NOT a characteristic of J2534 reprogramming?
A J2534 compliant pass-through system is a non-standardized programming and diagnostic system.
Testing for the door locks is found under the ________ menu on the scan tool.
Body control module
Two technicians are discussing the retrieval of emission-related data using a scan tool. Technician A states that a global-type scan tool can be used. Technician B states that only a factory-level scan tool will provide the required data. Which of the following statements about this scenario is true?
Both technician A's and B's assessments are accurate.
When checking for a vacuum leak in the engine, smoke is introduced into the ________ with a smoke machine.
Brake booster vacuum hose
Two technicians have serviced a vehicle and need to reset the powertrain control module (PCM) before state-mandated emission tests. Technician A suggests clearing the diagnostic trouble codes (DTCs) using a scan tool to reset the PCM. Technician B suggests that the vehicle be driven under similar conditions that were present when the fault occurred. Which of the following statements about this scenario is true?
Only technician B's assessment is accurate.
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 tha tonly a factory scan tool should be used to retrieve DTCs. Which technician is correct?
Technician A only
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?
Technician A only
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?
Technician B only
A paper test can be used to check for a possible problem with ____.
The ignition system (bad spark plug wire), A faulty injector on a multiport engine, and A burned valve
Which item is not important to know before starting the diagnosis of an engine performance problem?
The temperature of the engine when the problem occurs
Aftermarket scan tools are ________.
designed to function on more than one brand of vehicle
Race technicians want to program new ignition timing and fuel mapping specifications onto the current powertrain control module (PCM) chip of their team car. They remove the chip from the car, connect it to the workshop personal computer (PC) through an adapter, reprogram it with the new map and timing, reconnect the PCM back into the vehicle, and take it out for a test drive. Which of the following types of programming are they using?
off-board programming
Which of the following industry-standard methods is most likely to be used if the powertrain control module (PCM) must be programmed away from the vehicle?
off-board programming
In which of the following steps is the coolant level checked?
performing a thorough visual inspection
Which of the following programming methods uses a scan tool as an intermediary in transferring data from a personal computer (PC) to the powertrain control module (PCM)?
remote programming
Which of the following steps must immediately precede the step involving checking technical service bulletins?
retrieving diagnostic trouble codes
The preferred method of clearing diagnostic trouble codes is by ________.
using a scan tool
Which of the following is the first step in diagnosing a vehicle problem?
verifying the problem
