Automatic Transmission Diagnostic Procedures

• Introduction
  • Important
  • NGC Controller
  • System Coverage
  • Six-Step Troubleshooting Procedure
• Identification Of System
• System Description And Functional Operation
  • General Description
  • Functional Operation
    • Notes
    • AUTOSTICK Feature (If Equipped)
    • Transmission Operation And Shift Scheduling At Various Oil Temperatures.
  • Diagnostic Trouble Codes
    • Notes
    • Hard Code
    • One Trip Failures
    • Intermittent Code
    • Starts Since Set Counter
    • Trouble Code Erasure
    • Quick Learn
    • Clutch Volumes
    • EATX DTC Event Data
    • Electronic Pinion Factor (If Applicable)
  • Using The DRBIII®
  • DRBIII® Error Messages
    • Notes
    • DRBIII® Does Not Power Up (Blank Screen)
    • Display Is Not Visible
    • Some Display Items Read "-"
  • Transmission Simulator (Miller Tool # 8333) And Fwd Adapter (Miller Tool # 8333-1 A)
• 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
    • Electronic Pinion Factor Warnings (If Applicable)
    • Bulletins And Recalls
• Required Tools And Equipment
• Glossary Of Terms
  • Acronyms
  • Definitions
• Diagnostic Information And Procedures
  • Transmission - EATX - Symptoms
    • Symptom: *No Response From Transmission Control Module - EATX
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *Backup Lamps Come On While Shifter Is Not In Reverse Position
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *Backup Lamps Inoperative
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *Checking Park/Neutral Switch Operation
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *Incorrect Transmission Fluid Level
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *No Manual AUTOSTICK Operation
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *No Speedometer Operation
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *PRNDL Fault Clearing Procedure
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *Transmission Noisy With No DTC'S Present
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *Transmission Shifts Early With No DTC'S
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *Transmission Simulator 8333 Will Not Power Up
      • Diagnostic Procedure:
  • Transmission - EATX - Diagnostic Tests
    • P0122-TPS/Apps Low
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0123-TPS/Apps High
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0124-TPS/Apps Intermittent
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0218-High Temperature Operation Activated
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0562-Low Battery Voltage
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0604-Internal TCM
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0605-Internal TCM
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0613-Internal TCM
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0706-Check Shifter Signal
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0711-Transmission Temperature Sensor Performance
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0712-Transmission Temperature Sensor Low
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0713-Transmission Temperature Sensor High
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0714-Transmission Temperature Sensor Intermittent
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0715-Input Speed Sensor Error
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0720-Output Speed Sensor Error
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0725-Engine Speed Sensor Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0731-Gear Ratio Error In 1ST
      • When Monitored & Set Condition: P0731-GEAR RATIO ERROR IN 1ST
      • Possible Causes:
      • Diagnostic Procedure:
    • P0732-Gear Ratio Error In 2ND
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0733-Gear Ratio Error In 3RD
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0734-Gear Ratio Error In 4TH
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0736-Gear Ratio Error In Reverse
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0740-Torque Converter Clutch Control Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0750-LR Solenoid Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0755-2/4 Solenoid Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0760-Od Solenoid Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0765-UD Solenoid Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0841-LR Pressure Switch Sense Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0845-2/4 Hydraulic Pressure Test Failure
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0846-2/4 Pressure Switch Sense Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0870-Od Hydraulic Pressure Test Failure
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0871-Od Pressure Switch Sense Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0884-Power Up At Speed
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0888-Relay Output Always Off
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0890-Switched Battery
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0891-Transmission Relay Always On
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0897-Worn Out/Burnt Transaxle Fluid
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0944-Loss Of Prime
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0952-AUTOSTICK Input Circuit Low
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0992- 2-4/Od Hydraulic Pressure Test Failure
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1652-Serial Communication Link Malfunction
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1684-Battery Was Disconnected
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1687-No Communication With The Mic
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1694-Bus Communication With Engine Module
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1775-Solenoid Switch Valve Latched In TCC Position
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1776-Solenoid Switch Valve Latched In LR Position
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1790-Fault Immediately After Shift
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1793-TRD Link Communication Error
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1794-Speed Sensor Ground Error
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1797-Manual Shift Overheat
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
  • Transmission - NGC - Symptoms
    • Symptom: *No Response From Transmission Control Module - NGC
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *Backup Lamps Come On While Shifter Is Not In Reverse Position
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *Backup Lamps Inoperative
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *Checking Park/Neutral Switch Operation
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *No Manual AUTOSTICK Operation
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *PRNDL Fault Clearing Procedure
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *Transmission Noisy With No DTC'S Present
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *Transmission Shifts Early With No DTC'S
      • Possible Causes:
      • Diagnostic Procedure:
    • Symptom: *Transmission Simulator 8333 Will Not Power Up
      • Possible Causes:
      • Diagnostic Procedure:
  • Transmission - NGC - Diagnostic Tests
    • P0122-Throttle Position Sensor/Apps Low
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0123-Throttle Position Sensor/Apps High
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0124-Throttle Position Sensor/Apps Intermittent
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0218-High Temperature Operation Activated
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0562-Low Battery Voltage
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0604-Internal TCM; P0605-Internal TCM; P0613-Internal TCM
      • Notes
      • Possible Causes:
      • Diagnostic Procedure:
    • P0706-Check Shifter Signal
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0711-Transmission Temperature Sensor Performance
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0712-Transmission Temperature Sensor Low
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0713-Transmission Temperature Sensor High
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0714-Transmission Temperature Sensor Intermittent
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0715-Input Speed Sensor Error
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0720-Output Speed Sensor Error
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0725-Engine Speed Sensor Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0731-Gear Ratio Error In 1ST
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0732-Gear Ratio Error In 2ND
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0733-Gear Ratio Error In 3RD
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0734-Gear Ratio Error In 4TH
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0736-Gear Ratio Error In Reverse
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0740-Torque Converter Clutch Control Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0750-LR Solenoid Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0755-2/4 Solenoid Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0760-Od Solenoid Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0765-UD Solenoid Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0841-LR Pressure Switch Sense Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0845-2/4 Hydraulic Pressure Test Failure
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0846-2/4 Pressure Switch Sense Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0870-Od Hydraulic Pressure Test Failure
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0871-Od Pressure Switch Sense Circuit
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0884-Power Up At Speed
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0888-Relay Output Always Off
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0890-Switched Battery
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0891-Transmission Relay Always On
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0897-Worn Out/Burnt Transaxle Fluid
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0944-Loss Of Prime
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0952-AUTOSTICK Input Circuit Low
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P0992-2-4/Od Hydraulic Pressure Test Failure
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1652-Serial Communication Link Malfunction
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1684-Battery Was Disconnected
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1687-No Communication With The Mic
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1694-Bus Communication With Engine Module
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1775-Solenoid Switch Valve Latched In TCC Position
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1776-Solenoid Switch Valve Latched In LR Position
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1790-Fault Immediately After Shift
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1793-TRD Link Communication Error
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1794-Speed Sensor Ground Error
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
    • P1797-Manual Shift Overheat
      • When Monitored & Set Condition:
      • Possible Causes:
      • Diagnostic Procedure:
• Verification Tests
• Component Locations
  • AUTOSTICK (If Equipped)
  • Control Module Locations
    • EATX
    • NGC
  • Pressure Port Locations
  • Transmission Component Locations
• Connector PINOUTS
  • C104 (EATX)
  • C105 (EATX)
  • Crankshaft Position Sensor
  • Data Link Connector
  • Input Speed Sensor
  • Fuses (JB)
  • Left Back-Up Lamp
  • Output Speed Sensor
  • Fuses (PDC)
  • Transmission Control Relay
  • Powertrain Control Module C1 (NGC)
  • Powertrain Control Module C1 (SBEC)
  • Powertrain Control Module C2 (NGC)
  • Powertrain Control Module C2 (SBEC)
  • Powertrain Control Module C3 (NGC)
  • Powertrain Control Module C4 (NGC)
  • Right Back-Up Lamp
  • Throttle Position Sensor (2.0L/2.4L)
  • Throttle Position Sensor (2.7L)
  • Transmission Control Module (2.7L)
  • Transmission Range Sensor
  • Transmission Solenoid/Pressure Switch Assembly
• Schematic Diagrams
  • EATX
  • NGC
• Charts And Graphs
  • Transmission Range Sensor States
  • Pressure Switch States
  • Solenoid Application Chart
  • Shift Lever Error Codes
  • Transmission Temperature Sensor