Automatic Transmission Diagnostic Procedures

• Introduction
  • Notes
  • System Coverage
  • Six-Step Troubleshooting Procedure
• Identification Of System
• System Description And Functional Operation
  • General Description
  • Functional Operation
    • Notes
    • Controller Modes Of Operation
      • Permanent limp-in mode
      • Temporary limp-in mode
      • Undervoltage limp-in mode
      • Hardware Error Mode
      • Loss of Drive
      • Controlled Limp-in Mode
    • Mil Illumination
    • Solenoids
    • Transmission Component Descriptions
    • Transmission Operation And Shift Scheduling
    • Transmission ADAPTIVES - Initialize And Store
  • Diagnostic Trouble Codes
    • Notes
    • Active (Hard) Code
    • Stored (Intermittent) Code
    • Trouble Code Erasure
  • Using The DRBIII®
  • DRBIII® Error Messages
    • Notes
    • DRBIII® Does Not Power Up (Blank Screen)
    • Display Is Not Visible
• Disclaimers, Safety, And Warnings
  • Disclaimers
  • Safety
    • Technician Safety Information
    • Vehicle Preparation For Testing
    • Servicing Sub-Assemblies
    • DRBIII® Safety Information
  • Warnings
    • Vehicle Damage Warnings
    • Road Testing A Complaint Vehicle
    • Bulletins And Recalls
• Required Tools And Equipment
• Glossary Of Terms
  • Acronyms
  • Definitions
• Diagnostic Information And Procedures
  • Communication
    • Symptom: *NO RESPONSE FROM SHIFTER ASSEMBLY
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: *NO RESPONSE FROM TRANSMISSION CONTROL MODULE
      • Possible Causes
      • Diagnostic Procedure
  • Shift Lever Assembly
    • Symptom: BACKUP LAMP CKT SHORT TO GROUND
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: BACKUP LAMP CKT SHORT TO VOLTAGE OR OPEN
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: BACKUP LAMP SUPPLY CIRCUIT OPEN
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: CAN BUS CIRCUIT
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: INCORRECT CAN MESSAGE FROM ABS
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: INTERNAL CONTROLLER
      • Possible Causes
      • Repair Instructions:
        • Internal Controller
    • Symptom: LR WHEEL SPIN CAN MESSAGE NOT VALID
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: OVER VOLTAGE
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: RR WHEEL SPIN CAN MESSAGE NOT VALID
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: UNDER VOLTAGE
      • Possible Causes
      • Diagnostic Procedure
  • Transmission - Nag1
    • Symptom List: 1-2/4-5 SOLENOID CIRCUIT; 1-2/4-5 SOLENOID CIRCUIT SHORT TO GROUND
      • Notes
      • When Monitored and Set Condition:
        • 1-2/4-5 Solenoid Circuit
        • 1-2/4-5 Solenoid Circuit Short To Ground
      • Possible Causes
      • Diagnostic Procedure
    • Symptom List: 2-3 SOLENOID CIRCUIT; 2-3 SOLENOID CIRCUIT SHORT TO GROUND
      • Notes
      • When Monitored and Set Condition:
        • 2-3 Solenoid Circuit
        • 2-3 Solenoid Circuit Short To Ground
      • Possible Causes
      • Diagnostic Procedure
    • Symptom List: 3-4 SOLENOID CIRCUIT; 3-4 SOLENOID CIRCUIT SHORT TO GROUND
      • Notes
      • When Monitored and Set Condition:
        • 3-4 Solenoid Circuit
        • 3-4 Solenoid Circuit Short To Ground
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: ABS BRAKE MESSAGE
      • When Monitored and Set Condition:
        • Abs Brake Message
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: ABS CAN MESSAGE INCORRECT
      • When Monitored and Set Condition:
        • Abs Can Message Incorrect
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: ABS CAN MESSAGE MISSING
      • When Monitored and Set Condition:
        • Abs Can Message Missing
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: ABS LF SENSOR MESSAGE
      • When Monitored and Set Condition:
        • Abs LF Sensor Message
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: ABS LR SENSOR MESSAGE
      • When Monitored and Set Condition:
        • Abs LR Sensor Message
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: ABS RF SENSOR MESSAGE
      • When Monitored and Set Condition:
        • Abs RF Sensor Message
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: ABS RR SENSOR MESSAGE
      • When Monitored and Set Condition:
        • Abs RR Sensor Message
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: ACCEL PEDAL SENSOR CAN MESSAGE INCORRECT
      • When Monitored and Set Condition:
        • ACCEL Pedal Sensor Can Message Incorrect
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: CAN BUS CIRCUIT
      • When Monitored and Set Condition:
        • Can Bus Circuit
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: CAN MESSAGE FROM ECM FROM SLA
      • When Monitored and Set Condition:
        • Can Message From ECM From SLA
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: CONTROL MODULE TCM IS NOT CODED
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: ENGINE CAN MESSAGE INCORRECT
      • When Monitored and Set Condition:
        • Engine Can Message Incorrect
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: ENGINE CAN MESSAGE MISSING
      • When Monitored and Set Condition:
        • Engine Can Message Missing
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: ENGINE OVERSPEED
      • When Monitored and Set Condition:
        • Engine OVERSPEED
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: ENGINE RPM MESSAGE
      • When Monitored and Set Condition:
        • Engine Rpm Message
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: ENGINE TEMP MESSAGE
      • When Monitored and Set Condition:
        • Engine Temp Message
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: ENGINE TORQUE MESSAGE INCORRECT
      • When Monitored and Set Condition:
        • Engine Torque Message Incorrect
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: ENGINE TORQUE REDUCTION
      • When Monitored and Set Condition:
        • Engine Torque Reduction
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: IC CAN MESSAGE INCORRECT
      • When Monitored and Set Condition:
        • Ic Can Message Incorrect
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: IC/ATC CAN MESSAGE MISSING
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: IMPROPER GEAR
      • When Monitored and Set Condition:
        • Improper Gear
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: IMPROPER RATIO
      • When Monitored and Set Condition:
        • Improper Ratio
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: INPUT SENSOR MISMATCH
      • When Monitored and Set Condition:
        • Input Sensor Mismatch
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: INPUT SENSOR OVERSPEED
      • When Monitored and Set Condition:
        • Input Sensor OVERSPEED
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: INTERNAL CONTROLLER
      • When Monitored and Set Condition:
        • Internal Controller
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: INVALID CONTROL MODULE VERSION
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: MODULATING PRESSURE SOLENOID CIRCUIT
      • When Monitored and Set Condition:
        • Modulating Pressure Solenoid Circuit
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: N2 INPUT SPEED SENSOR CIRCUIT
      • When Monitored and Set Condition:
        • N2 Input Speed Sensor Circuit
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: N3 INPUT SPEED SENSOR CIRCUIT
      • When Monitored and Set Condition:
        • N3 Input Speed Sensor Circuit
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: SENSOR SUPPLY VOLTAGE
      • When Monitored and Set Condition:
        • Sensor Supply Voltage
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: SHIFT LEVER POSITION INVALID
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: SHIFT PRESSURE SOLENOID CIRCUIT
      • When Monitored and Set Condition:
        • Shift Pressure Solenoid Circuit
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: SLA CAN MESSAGE INCORRECT
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: SOLENOID SUPPLY VOLTAGE
      • When Monitored and Set Condition:
        • Solenoid Supply Voltage
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: SOLENOID SUPPLY/WATCHDOG
      • When Monitored and Set Condition:
        • Solenoid Supply/Watchdog
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: SYSTEM OVERVOLTAGE
      • When Monitored and Set Condition:
        • System OVERVOLTAGE
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: SYSTEM UNDERVOLTAGE
      • When Monitored and Set Condition:
        • System UNDERVOLTAGE
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: TCC OVER TEMP
      • When Monitored and Set Condition:
        • TCC Over Temp
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: TCC SOLENOID CIRCUIT
      • When Monitored and Set Condition:
        • TCC Solenoid Circuit
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: TCC STUCK ON
      • When Monitored and Set Condition:
        • TCC Stuck On
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: TRANS TEMP SENSOR - P/N SWITCH CIRCUIT
      • When Monitored and Set Condition:
        • Trans Temp Sensor - P/N Switch Circuit
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: TRANS TEMP SENSOR ERRATIC
      • When Monitored and Set Condition:
        • Trans Temp Sensor Erratic
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: TRANS TEMP SENSOR SHORTED
      • When Monitored and Set Condition:
        • Trans Temp Sensor Shorted
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: TRANSMISSION SLIPPING
      • When Monitored and Set Condition:
        • Transmission Slipping
      • Possible Causes
      • Diagnostic Procedure
  • Verification Tests
    • Verification Tests
• Component Location
  • Engine Control Module
  • Transmission Control Module
  • Transmission Solenoid Assembly
• Connector PINOUTS
  • Shifter Assembly - Black
  • Transmission Control Module C1 - Black
  • Transmission Control Module C2 - Black
  • Relay Block
  • Transmission Solenoid Assembly - Black
• Schematic Diagrams
• Charts And Graphs
  • 5 Volt Square Wave - Typical Pattern
  • Transmission Temp Sensor Charts