Engine Controls - Theory & Operation
- Introduction
- Computerized Engine Controls
- Powertrain Control Module
- Input Devices
- Notes
- Auto Shutdown Relay
- Battery Voltage
- Brake Switch
- Camshaft Position Sensor (Grand Cherokee - 4.0L & Wrangler - 4.0L)
- Camshaft Position Sensor (Grand Cherokee - 4.7L & Liberty - 3.7L)
- Camshaft Position Sensor (Liberty - 2.4L)
- Camshaft Position Sensor (Wrangler - 2.5L)
- Crankshaft Position Sensor (Grand Cherokee - 4.0L & Wrangler)
- Crankshaft Position Sensor (Grand Cherokee - 4.7L & Liberty - 3.7L)
- Crankshaft Position Sensor (Liberty - 2.4L)
- Fuel Level Sensor
- Engine Coolant Temperature Sensor
- Knock Sensors (Grand Cherokee - 4.7L High Output & Liberty - 3.7L)
- Oxygen (O2) Sensor
- Ignition Circuit Sense
- Intake Air Temperature Sensor
- Manifold Absolute Pressure Sensor
- Oil Pressure Sensor
- Power Steering Pressure Switch (Liberty & Wrangler)
- Throttle Position Sensor
- Vehicle Speed Sensor (Wrangler)
- 5-Volt Supply
- Output Signals
- Notes
- A/C Clutch Relay
- Automatic Shutdown Relay
- Cruise Control Servo
- Evaporative Emission System
- Fuel Injectors
- Fuel Pump Relay
- Generator Field
- Generator Light
- Idle Air Control Motor
- Ignition Coil
- Injection Timing
- Malfunction Indicator Light
- Radiator Cooling Fan Relay
- Serial Communication Interface (SCI) Transmit
- Upshift Indicator Light (M/T)
- Fuel Systems
- Ignition Systems
- Timing Control Systems
- Notes
- Camshaft Position Sensor
- Distributor (Wrangler - 2.5L)
- Engine Coolant Temperature Sensor
- Idle Air Control Motor
- Ignition Coils (Grand Cherokee - 4.0L & Wrangler - 4.0L)
- Ignition Coils (Grand Cherokee - 4.7L & Liberty - 3.7L)
- Ignition Coil (Liberty - 2.4L)
- Ignition Coil (Wrangler - 2.5L)
- Intake Air Temperature Sensor
- Knock Sensor
- Manifold Absolute Pressure Sensor
- Powertrain Control Module
- Spark Plugs (Grand Cherokee)
- Spark Plugs (Liberty & Wrangler)
- Throttle Position Sensor
- Timing Control Systems
- Emission Systems & Sub-Systems
- Closed Crankcase Ventilation
- Positive Crankcase Ventilation
- Evaporative Emission System
- EVAP Canister
- EVAP Canister Purge Solenoid
- Fuel Filler Cap
- Leak Detection Pump System
- Notes
- LDP At Rest (Not Powered)
- Diaphragm Upward Movement
- Diaphragm Downward Movement
- Pumping Action
- EVAP Leak Detection Test Enabling Conditions
- Section 1 - P1495 Leak Detection Pump Solenoid Circuit
- Section 2 - P1494 Leak Detection Pump Switch Or Mechanical Fault
- Section 3 - P1486 EVAP Leak Monitor Pinched Hose Found
- Section 4 - No DTC Can Be Set During This Time
- Section 5 - DTC P0442, P0456, P0455 EVAP Leak Monitor & Leak Detected
- Diagnostic Tips
- Test Equipment
- On-Board Refueling Vapor Recovery
- Pressure Relief/Rollover Valve
- Self-Diagnostic System
- Notes
- State Display Test Mode
- Circuit Actuation Test Mode
- Task Manager
- Test Sequence
- Malfunction Indicator Light
- Diagnostic Trouble Code Priority
- Trip Indicator
- Freeze Frame Data Storage
- Similar Conditions Window
- Monitors
- Non-Monitored Circuits
- High & Low Limits
- Trip Definition
- Serial Communications Interface (Sci) Transmit
- Miscellaneous Controls