ASE T1 Domain 8: Computerized Engine Controls Diagnosis and Repair Welcome to your ASE T1 Domain 8: Computerized Engine Controls Diagnosis and Repair 1. ASE T1: Computerized Engine Controls Diagnosis and Repair A vehicle's engine control module (ECM) has entered a "limp home" mode. What is the LEAST likely cause of this issue? A. Transmission speed sensor failure B. Throttle position sensor (TPS) circuit fault C. A disconnected ECM ground wire D. Defective spark plug None 2. ASE T1: Computerized Engine Controls Diagnosis and Repair A vehicle with a returnless fuel system is experiencing high fuel pressure at idle. Which of the following could be a possible cause? A. Faulty manifold absolute pressure (MAP) sensor B. Open in the fuel pump driver module (FPDM) control circuit C. Defective fuel tank pressure (FTP) sensor D. Malfunctioning electronic throttle control (ETC) system None 3. ASE T1: Computerized Engine Controls Diagnosis and Repair A technician retrieves a DTC P0102 for Mass Air Flow (MAF) sensor low input. Which of the following is the MOST likely cause? A. Disconnected MAF sensor connector B. Damaged MAF sensor hot wire C. Short to voltage in the MAF sensor circuit D. Stuck open EGR valve None 4. ASE T1: Computerized Engine Controls Diagnosis and Repair What does a DTC indicating a "lean condition" in bank 1 typically suggest? A. Excessive fuel being supplied to bank 1 B. Bank 1 is not receiving enough fuel C. An incorrect reading from the bank 1 oxygen sensor D. Too much air entering the exhaust system through bank 1 None 5. ASE T1: Computerized Engine Controls Diagnosis and Repair The presence of which DTC would indicate a potential fault with the vehicle speed sensor (VSS) signal? A. P0500 B. P0420 C. P0300 D. P0130 None 6. ASE T1: Computerized Engine Controls Diagnosis and Repair An intermittent fault in the knock sensor circuit would most likely result in what engine behavior? A. Increased emissions at all speeds B. Premature detonation under load C. Lowered engine power during acceleration D. Increased fuel economy None 7. ASE T1: Computerized Engine Controls Diagnosis and Repair When a vehicle's ECM sets a DTC for an "open loop operation due to insufficient temperature during warm-up," which component should be inspected first? A. The intake air temperature sensor B. The engine coolant temperature sensor C. The thermostat D. The mass air flow sensor None 8. ASE T1: Computerized Engine Controls Diagnosis and Repair A vehicle exhibits a lack of power and sets a code for turbocharger boost pressure not meeting expected values. What should be the first line of diagnosis? A. Check for a leaking intake manifold gasket. B. Inspect the wastegate actuator and linkage. C. Test the mass air flow sensor for proper operation. D. Verify operation of the boost pressure sensor. None 9. ASE T1: Computerized Engine Controls Diagnosis and Repair If a vehicle's adaptive fuel strategy has been reset, what initial condition is MOST likely to be true? A. The long-term fuel trims will be at default values. B. The engine will run rich to protect against knock. C. The ECM will increase idle speed to prevent stalling. D. The ECM will disregard O2 sensor readings. None 10. ASE T1: Computerized Engine Controls Diagnosis and Repair What could cause a vehicle's ECM to incorrectly determine that the engine is constantly cold, leading to enriched fuel mixtures and poor fuel economy? A. A faulty intake air temperature sensor B. A stuck-open thermostat C. A malfunctioning coolant temperature sensor D. An overactive electric cooling fan None 1 out of 10 Time is Up! Time's up
