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High-pressure switch disengagement indicates head pressure too high, usually due to blocked condenser airflow. Low charge (B) would lower head. Blower resistor (C) affects air distribution, not head pressure. Evap leak (D) causes loss of charge, not high cutout. ASE T7 emphasizes condenser airflow checks when high pressure switch activates.

Higher than normal secondary voltage indicates resistance to spark. A fouled or worn plug requires more voltage to fire. A shorted coil (B) reduces output. A rich injector (C) lowers resistance, reducing voltage. A clogged converter (D) causes backpressure but not voltage differences. ASE T1 stresses scope analysis to identify ignition faults by comparing firing lines and spark duration.

Random misfire under heavy load points to insufficient fuel delivery or ignition breakdown at high demand. Slightly positive trims at WOT (where trims are limited but can still indicate trend) suggest the engine may be fuel-starved when airflow peaks. A dynamic fuel test—verifying rail pressure stability and pump volume under load—is the best next step. A cylinder leakage test (A) can reveal mechanical faults but typically causes consistent misfires, hot or cold, not only at high demand. EVAP purge (C) does not materially affect WOT operation, and purge is usually disabled then. A CKP scope at idle (D) won’t reveal high-load ignition stress unless there’s a synchronization fault; misfires only at load more commonly trace to fuel volume (plugged filter, weak pump) or coil insulation breakdown. ASE T1 objectives stress duplicating conditions: measure fuel pressure/volume during loaded acceleration or with a wide-open throttle test to isolate delivery limits before intrusive mechanical tests.

If MAF readings are lower than expected, the PCM delivers less fuel, causing lean hesitation. Fuel pressure is fine, eliminating pump/filter issues. Weak coils (B) cause misfire but not low MAF readings. Leaking EGR (C) would dilute charge but typically set flow codes. A sticking injector (D) would affect one cylinder, not the MAF airflow signal. ASE T1 stresses using scan data to compare MAF airflow to expected load as a key diagnostic step.

If DOC cannot generate heat, regeneration will fail. EGR (B) reduces NOx but does not stop DOC heating. Turbo actuator (C) and intercooler (D) affect boost, not DOC temp. ASE T2 stresses DOC function is critical to initiating DPF regeneration.