Engine Controls - Tests W/Codes

• Introduction
• Model Identification
• Self-Diagnostic System
  • System Diagnosis
    • Notes
    • Hard Failures
    • Intermittent Failures
  • Service Precautions
  • Fuel Pressure Release
  • Visual Inspection
  • Diagnostic Procedure
  • Entering On-Board Diagnostics
    • Notes
    • Obtaining Fault Codes
  • Clearing Trouble Codes
• DTC & Fault Codes/Messages
  • FAULT CODES/MESSAGES (Note: For DTC table, see TEST NS-1A under "Testing.")
  • DRB-II Test Functions
    • Notes
    • DRB-II Diagnostic Mode
    • SYSTEM TEST Mode
    • READ FAULTS Mode
    • STATE DISPLAY Mode
    • ACTUATOR TEST Mode
    • ADJUSTMENTS Mode
    • DRB-II Volt/Ohmmeter Mode
    • DRB-II Continuity Meter Mode
    • VEHICLES TESTED Mode
    • HOW TO USE Mode
    • CONFIGURE Mode
  • DRB-II Problems & Error Messages
    • Blank DRB-II Message Screen
    • NO RESPONSE Message
    • Other Error Messages
  • Emission Maintenance Reminder (EMR) Memory Test
  • Emission Maintenance Reminder (EMR) Light Reset Procedure
  • Emission Maintenance Reminder (EMR) Mileage Transfer
• Theft Alarm System
  • Notes
  • Self-Diagnostic Test
    • Cherokee
  • Parking Lights & Taillights Do Not Flash
    • Cherokee
  • All Exterior Lights Do Not Flash, But Work Normally
    • Cherokee
  • Headlights Do Not Flash, But Work Normally
    • Cherokee
  • Horn Does Not Sound Twice
    • Cherokee
  • Horn Sounds Twice And Headlights, Parking & Tail Lights Flash
    • Cherokee
  • Summary
• Connector Identification
• Self-Diagnostic Tests - Preliminary Information
• No-Start Tests
  • Test NS-1A - Qualifying No Start Condition
  • Test NS-2A - Inspecting Fuel System
  • Test NS-3A - Inspecting Mechanical System
  • Test NS-4A - Correcting Fuel Delivery
  • Test NS-4B - Correcting Fuel Delivery
  • Test NS-5A, "Fuel Injector Control Circuit"
  • Test NS-6A - Repairing Fault "Auto Idle Speed Motor Circuit"
  • Test NS-7A - Inspecting Fuel Pump
  • Test NS-7B - Inspecting Fuel Pump
  • Test NS-8A - "No Response" Condition
  • Test NS-9A - "No Reference Signal During Cranking"
  • Test NS-9B - "No Sync Pick-Up Signal"
  • Test NS-10A - "Auto Shutdown Relay Control Circuit"
  • Test NS-11A - "No ASD Relay Voltage Sense At Controller"
  • Test NS-12A - Inspecting AIS Motor Operation
  • Test NS-12B - Inspecting AIS Motor Operation
  • Test NS-12C - Inspecting AIS Motor Operation
  • Test NS-12D - Inspecting AIS Motor Operation
  • Test NS-12E - Inspecting AIS Motor Operation
  • Test NS-13A - Correcting Start & Stall Condition
• DRIVEABILITY Tests
  • Test Dr-1A - Checking System For Faults
  • Test Dr-2A - "Slow Or No Change In Idle Map Signal" (DTC 13)
  • Test Dr-3A - "Slow Or No Change In Map From Start To Run" (DTC 13)
  • Test Dr-4A - "Map Voltage Too Low" (DTC 14)
  • Test Dr-5A - "Map Voltage Too High" (DTC 14)
  • Test Dr-6A - "No Vehicle Speed Signal" (DTC 15)
  • Test Dr-6B - "No Vehicle Speed Signal"
  • Test Dr-7A - "Oxygen (O2) Sensor Signal Stays At Center" (DTC 21)
  • Test Dr-8A - "Oxygen (O2) Signal Shorted To Voltage" (DTC 21)
  • Test Dr-9A - "Oxygen (O2) Signal Stays Above Center (Rich)" (DTC 52)
  • Test Dr-10A - "Oxygen (O2) Signal Stays Below Center (Lean)" (DTC 51)
  • Test Dr-11A - "Coolant Sensor Voltage Too High" (DTC 22)
  • Test Dr-12A - "Coolant Sensor Voltage Too Low" (DTC 22)
  • Test Dr-13A - "Throttle Position Sensor (TPS) Voltage High" (DTC 24)
  • Test Dr-14A - "Throttle Position Sensor (TPS) Voltage Low" (DTC 24)
  • Test Dr-15A - "Automatic Idle Speed Motor Circuits" (DTC 25)
  • Test Dr-16A - "Injector No. 1 Control Circuit" (DTC 27)
  • Test Dr-16B - "Injector No. 1 Control Circuit"
  • Test Dr-17A - "Injector No. 2 Control Circuit" (DTC 27)
  • Test Dr-17B - "Injector No. 2 Control Circuit"
  • Test Dr-18A - "Injector No. 3 Control Circuit" (DTC 27)
  • Test Dr-18B - "Injector No. 3 Control Circuit"
  • Test Dr-19A - "Injector No. 4 Control Circuit" (DTC 27)
  • Test Dr-19B - "Injector No. 4 Control Circuit"
  • Test Dr-20A - "Injector No. 5 Control Circuit" (DTC 27)
  • Test Dr-20B - "Injector No. 5 Control Circuit"
  • Test Dr-21A - "Injector No. 6 Control Circuit" (DTC 27)
  • Test Dr-21B - "Injector No. 6 Control Circuit"
  • Test Dr-22A - "A/C Clutch Relay Circuit" (DTC 33)
  • Test Dr-22B - "A/C Clutch Relay Circuit"
  • Test Dr-23A - "Radiator Fan Relay Circuit" (DTC 35)
  • Test Dr-24A - "Fuel Pump Resistor By-Pass Relay Circuit" (DTC 76)
  • Test Dr-25A - "No ASD Voltage Sense At Controller" (DTC 42)
  • Test Dr-26A - "Charge Temp Voltage High" (DTC 46)
  • Test Dr-27A - "Charge Temp Voltage Low" (DTC 47)
  • TEST DR-28A - "CONTROLLER FAILURE EMR MILES NOT STORED" OR "CONTROLLER FAILURE EEPROM WRITE DENIED" (DTC 62 or 63)
  • Test Dr-30A - Intermittent Test For Sensor Voltage
  • Test Dr-30B - Intermittent Map Sensor Signal Change
  • Test Dr-31A - Intermittent AIS Motor Circuit Fault
  • Test Dr-32A - Intermittent Injector Control Circuit Fault
  • Test Dr-33A - Intermittent Relay Or Solenoid Fault
  • Test Dr-34A - Intermittent ASD Sense Circuit Fault
• No-Fault Tests
  • Test NF-1A - No Fault Test Code Menu
  • Test NF-2A - Checking Secondary Ignition & Timing
  • Test NF-3A - Checking Fuel Pressure
  • Test NF-3B - Checking Fuel System
  • Test NF-4A - Checking Coolant Sensor & TPS Calibrations
  • Test NF-5A - Checking Map Sensor Calibration
  • Test NF-6A - Checking Oxygen (O2) Sensor Switching
  • Test NF-6B - Checking Oxygen (Locked Lean)
  • Test NF-7A - Checking Idle Speed Motor Operation
  • Test NF-7B - Checking Idle Speed Motor Operation
  • Test NF-8A - Checking Park/Neutral Switch Input (A/T Only)
  • Test NF-9A - Checking Engine Controller Grounds
  • Test NF-10A - Checking Engine Vacuum
  • Test NF-11A - Performing No Fault Mechanical Test
• Verification Tests
  • Verification Test VER-1
  • Verification Test VER-2
  • Verification Test VER-3
• Wiring Diagrams