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A low temp reading makes ECM think engine is cold, extending fueling and creating black smoke. Reduction (B), boost increase (C), and ignoring (D) are not correct. ASE stresses verifying scan vs. thermometer readings.

Circuit low means EGR position sensor signal is too low. Circuit high (B) is opposite. ECM commands (C) and turbo faults (D) are unrelated. ASE stresses circuit testing for reference/ground issues.

Worn piston rings allow gases into the crankcase and oil into combustion, causing oil loss and pressure rise. Turbo, fuel, and glow faults don’t explain crankcase symptoms. ASE stresses compression/leak-down testing.

At KOEO, MAP should equal BARO. If higher, MAP is out of calibration. Boost (B) isn’t possible KOEO, and glow plugs/rail sensors (C, D) are unrelated. ASE stresses KOEO checks for sensor plausibility.

A stuck-closed wastegate prevents exhaust from bypassing the turbine, creating excessive boost pressure. This may damage the engine, intercooler, or turbocharger. Idle stalling (A) is unrelated. Low boost (B) occurs if the wastegate is stuck open. Reduced injector pulse width (D) is a control strategy, not a direct result. ASE emphasizes inspecting turbocharger wastegates for free movement and actuator control.