Lesson 1Engine Coolant Heat and Air Intake Heat: Effect on Fueling and Smoke Control WaysLearn how coolant and intake air heat change fueling, timing, and smoke plans. Know warm-up ways, sensor check makes sense, and how wrong readings cause hard starts, smoke, or poor clean-up control.
Cold start temperature expectationsECT vs IAT plausibility comparisonTemperature effects on injection timingImpact on EGR and DPF strategiesDetecting biased or stuck temp sensorsLesson 2Intake Manifold Pressure and Outside Pressure: Expected Values at Idle and Under Load, and Links to BoostStudy intake manifold and outside pressure data to check boost system work. Learn expected idle and load values, height effects, and how to use pressure links to find boost leaks, stuck turbos, or wrong MAP sensors.
Ambient pressure and altitude effectsExpected MAP at key load pointsUsing KOEO readings for sensor checksPatterns indicating boost leaksDetecting MAP sensor bias or driftLesson 3Exhaust Back Pressure (or DPF Difference Pressure): Expected Ranges, Clean-Up Starts, and Signs of BlockLearn how to understand exhaust back pressure and DPF difference pressure PIDs. Know normal ranges at idle and load, how clean-up changes readings, and how rising pressure shows exhaust blocks or failing DPF systems.
Normal back pressure at idle and loadDPF differential pressure thresholdsPressure behavior during regenerationIdentifying exhaust restrictions upstreamSensor and hose fault differentiationLesson 4Mass Air Flow (MAF) or Intake Air Mass: Expected Ranges, Sensor Answer to Throttle Changes, and Effect on FuelingLook at how to understand MAF or counted air mass readings under different loads. Learn expected ranges, answer to throttle changes, and how air flow data works with EGR and boost to guide right fueling and smoke control check.
Baseline MAF at idle and no-loadMAF response to snap throttle testsMAF changes with EGR on and offUsing MAF to confirm boost deliveryDetecting contaminated MAF sensorsLesson 5Fuel Rail Pressure Sensor Voltage/PID and Rail Pressure Need vs Real CompareKnow how to read rail pressure sensor voltage and pressure PIDs, and compare ordered versus real values. Learn to see slow answer, too much, and low-pressure events that show pump, regulator, leak, or sensor problems.
Typical rail pressure at idle and WOTSensor voltage to pressure relationshipCommanded vs actual pressure graphsDiagnosing slow pressure responseIdentifying leaks and relief valve issuesLesson 6EGR Position and Flow Signs: Typical Position Ranges, Answer to Orders, and Signs of EGR FaultsKnow how to read EGR position and flow data, compare ordered versus real values, and see slow or stuck answers. Learn how EGR faults change drive, smoke, and how to split EGR issues from boost or air flow problems.
Typical EGR position ranges by loadCommanded vs actual EGR correlationSymptoms of stuck-open EGR valvesSymptoms of stuck-closed EGR valvesUsing MAF and MAP to confirm EGR flowLesson 7Injector Fix/Each Cylinder Trim: Normal Small Trims, Big Fixes Showing Injector/ECU/Pressure IssuesLearn how injector fix values show cylinder balance, fueling rightness, and burn quality. Know normal trim ranges, when big changes are worry, and how to link patterns to mechanical, electrical, or ECU faults.
Normal trim ranges at idle and cruiseInterpreting positive vs negative trimsPatterns indicating faulty injectorsDistinguishing ECU vs mechanical issuesEffects of rail pressure errors on trimsLesson 8Engine RPM, Throttle Position, and Accelerator Pedal Position: Link Checks and Drive-by-Wire SenseLook at how RPM, throttle position, and accelerator pedal signals work in drive-by-wire systems. Learn to spot link faults, dead spots, and delay that cause wait, limp mode, or unsafe speed up in road tests.
Expected idle and cruise RPM valuesDual-track pedal sensor agreementThrottle plate vs pedal position trackingDetecting signal dropouts and noiseDrive-by-wire faults causing limp modeLesson 9Turbo Boost Pressure and Wastegate Control: Expected Boost Curves, Delay Under Load, and Checking Boost LeaksUnderstand turbo boost pressure and wastegate or VGT control data. Learn expected boost curves, okay delay, and how to use scan tool graphs to split boost leaks, sticking parts, and control issues from real engine load problems.
Target vs actual boost comparisonAcceptable turbo lag characteristicsUsing actuator command PIDsPatterns of boost leaks under loadOverboost and underboost fault cluesLesson 10Fuel Heat and Fuel Heat Sensor Ways: Why It Matters for Fueling Fix and Expected RangesLearn why fuel heat is watched, how it changes density and fix, and what ranges are usual. Know sensor ways during hot soak, re-circle, and how wrong readings can mislead rail pressure and amount control.
Normal fuel temperature operating rangeHot soak and recirculation effectsFuel temp influence on density modelsInteraction with rail pressure controlIdentifying faulty temp sensor signalsLesson 11High-Pressure Rail Pressure: Normal Ranges, Expected Ways Under Load, and Signs of Low Rail Pressure IssuesStudy high-pressure rail ways across work conditions. Learn normal pressure ranges, build-up times, and steadiness under load, and how changes point to worn pumps, injector leaks, control valve faults, or supply problems.
Pressure ramp-up during crankingStability at idle and steady cruisePressure response to rapid load stepsSigns of internal injector leakagePump wear vs suction restriction cluesLesson 12Battery Voltage and Crank/Charge System Measures: Effects on High-Pressure Pump and Injector Driver WorkKnow how battery voltage and charging data change high-pressure pump output and injector drivers. Learn to check cranking voltage, alternator rule, and how low voltage can look like fuel or sensor faults in checking.
Minimum cranking voltage thresholdsStarter current draw and RPM impactAlternator output and load responseVoltage sensitivity of injector driversLow-voltage induced false DTCs
