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
    • 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
    • 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 #8333-1A)
• 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
  • Diagnostic Code Index
  • Communication - Symptoms
    • Symptom: *NO RESPONSE FROM TRANSMISSION CONTROL MODULE - EATX (DIESEL)
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: *NO RESPONSE FROM TRANSMISSION CONTROL MODULE-NGC
      • Possible Causes
      • Diagnostic Procedure
  • Transmission - EATX - Symptoms
    • Symptom: *CHECKING PARK/NEUTRAL SWITCH OPERATION
      • Possible Causes
      • Diagnostic Procedure
    • Symptom: *INCORRECT TRANSMISSION FLUID LEVEL
      • 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
  • Transmission - EATX - Diagnostic Tests
    • P0122-TPS/Apps Low
      • When Monitored and Set Condition:
        • P0122-TPS/Apps Low
      • Possible Causes
      • Diagnostic Procedure
    • P0123-TPS/Apps High
      • When Monitored and Set Condition:
        • P0123-TPS/Apps High
      • Possible Causes
      • Diagnostic Procedure
    • P0124-TPS/Apps Intermittent
      • When Monitored and Set Condition:
        • P0124-TPS/Apps Intermittent
      • Possible Causes
      • Diagnostic Procedure
    • P0218-High Temperature Operation Activated
      • When Monitored and Set Condition:
        • P0218-High Temperature Operation Activated
      • Possible Causes
      • Diagnostic Procedure
    • P0562-Low Battery Voltage
      • When Monitored and Set Condition:
        • P0562-Low Battery Voltage
      • Possible Causes
      • Diagnostic Procedure
    • P0604-Internal TCM
      • When Monitored and Set Condition:
        • P0604-Internal TCM
      • Possible Causes
      • Diagnostic Procedure
    • P0605-Internal TCM
      • When Monitored and Set Condition:
        • P0605-Internal TCM
      • Possible Causes
      • Diagnostic Procedure
    • P0613-Internal TCM
      • When Monitored and Set Condition:
        • P0613-Internal TCM
      • Possible Causes
      • Diagnostic Procedure
    • P0706-Check Shifter Signal
      • When Monitored and Set Condition:
        • P0706-Check Shifter Signal
      • Possible Causes
      • Diagnostic Procedure
    • P0711-Transmission Temperature Sensor Performance
      • When Monitored and Set Condition:
        • P0711-Transmission Temperature Sensor Performance
      • Possible Causes
      • Diagnostic Procedure
    • P0712-Transmission Temperature Sensor Low
      • When Monitored and Set Condition:
        • P0712-Transmission Temperature Sensor Low
      • Possible Causes
      • Diagnostic Procedure
    • P0713-Transmission Temperature Sensor High
      • When Monitored and Set Condition:
        • P0713-Transmission Temperature Sensor High
      • Possible Causes
      • Diagnostic Procedure
    • P0714-Transmission Temperature Sensor Intermittent
      • When Monitored and Set Condition:
        • P0714-Transmission Temperature Sensor Intermittent
      • Possible Causes
      • Diagnostic Procedure
    • P0715-Input Speed Sensor Error
      • When Monitored and Set Condition:
        • P0715-Input Speed Sensor Error
      • Possible Causes
      • Diagnostic Procedure
    • P0720-Output Speed Sensor Error
      • When Monitored and Set Condition:
        • P0720-Output Speed Sensor Error
      • Possible Causes
      • Diagnostic Procedure
    • P0725-Engine Speed Sensor Circuit
      • When Monitored and Set Condition:
        • P0725-Engine Speed Sensor Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0731-Gear Ratio Error In 1ST
      • When Monitored and Set Condition:
        • P0731-Gear Ratio Error In 1ST
      • Possible Causes
      • Diagnostic Procedure
    • P0732-Gear Ratio Error In 2ND
      • When Monitored and Set Condition:
        • P0732-Gear Ratio Error In 2ND
      • Possible Causes
      • Diagnostic Procedure
    • P0733-Gear Ratio Error In 3RD
      • When Monitored and Set Condition:
        • P0733-Gear Ratio Error In 3RD
      • Possible Causes
      • Diagnostic Procedure
    • P0734-Gear Ratio Error In 4TH
      • When Monitored and Set Condition:
        • P0734-Gear Ratio Error In 4TH
      • Possible Causes
      • Diagnostic Procedure
    • P0736-Gear Ratio Error In Reverse
      • When Monitored and Set Condition:
        • P0736-Gear Ratio Error In Reverse
      • Possible Causes
      • Diagnostic Procedure
    • P0740-TCC Out Of Range
      • When Monitored and Set Condition:
        • P0740-TCC Out Of Range
      • Possible Causes
      • Diagnostic Procedure
    • P0750-LR Solenoid Circuit
      • When Monitored and Set Condition:
        • P0750-LR Solenoid Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0755-2/4 Solenoid Circuit
      • When Monitored and Set Condition:
        • P0755-2/4 Solenoid Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0760-Od Solenoid Circuit
      • When Monitored and Set Condition:
        • P0760-Od Solenoid Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0765-UD Solenoid Circuit
      • When Monitored and Set Condition:
        • P0765-UD Solenoid Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0841-LR Pressure Switch Sense Circuit
      • When Monitored and Set Condition:
        • P0841-LR Pressure Switch Sense Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0845-2/4 Hydraulic Pressure Test Failure
      • When Monitored and Set Condition:
        • P0845-2/4 Hydraulic Pressure Test Failure
      • Possible Causes
      • Diagnostic Procedure
    • P0846-2/4 Pressure Switch Sense Circuit
      • When Monitored and Set Condition:
        • P0846-2/4 Pressure Switch Sense Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0870-Od Hydraulic Pressure Test Failure
      • When Monitored and Set Condition:
        • P0870-Od Hydraulic Pressure Test Failure
      • Possible Causes
      • Diagnostic Procedure
    • P0871-Od Pressure Switch Sense Circuit
      • When Monitored and Set Condition:
        • P0871-Od Pressure Switch Sense Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0882-TCM Power Input Low; P0888-Relay Output Always Off
      • Notes
      • When Monitored and Set Condition:
        • P0882-TCM Power Input Low
        • P0888-Relay Output Always Off
      • Possible Causes
      • Diagnostic Procedure
    • P0883-TCM Power Input High; P0891-Transmission RLY Always On
      • Notes
      • When Monitored and Set Condition:
        • P0883-TCM Power Input High
        • P0891-Transmission RLY Always On
      • Possible Causes
      • Diagnostic Procedure
    • P0884-Power Up At Speed
      • When Monitored and Set Condition:
        • P0884-Power Up At Speed
      • Possible Causes
      • Diagnostic Procedure
    • P0890-Switched Battery
      • When Monitored and Set Condition:
        • P0890-Switched Battery
      • Possible Causes
      • Diagnostic Procedure
    • P0897-Worn Out/Burnt Transaxle Fluid
      • When Monitored and Set Condition:
        • P0897-Worn Out/Burnt Transaxle Fluid
      • Possible Causes
      • Diagnostic Procedure
    • P0944-Loss Of Prime
      • When Monitored and Set Condition:
        • P0944-Loss Of Prime
      • Possible Causes
      • Diagnostic Procedure
    • P0992-2-4/Od Hydraulic Pressure Test Failure
      • When Monitored and Set Condition:
        • P0992-2-4/Od Hydraulic Pressure Test Failure
      • Possible Causes
      • Diagnostic Procedure
    • P1652-Serial Communication Link Malfunction
      • When Monitored and Set Condition:
        • P1652-Serial Communication Link Malfunction
      • Possible Causes
      • Diagnostic Procedure
    • P1684-Battery Was Disconnected
      • When Monitored and Set Condition:
        • P1684-Battery Was Disconnected
      • Possible Causes
      • Diagnostic Procedure
    • P1687-No Communication With The Mic
      • When Monitored and Set Condition:
        • P1687-No Communication With The Mic
      • Possible Causes
      • Diagnostic Procedure
    • P1694-Bus Communication With Engine Module
      • When Monitored and Set Condition:
        • P1694-Bus Communication With Engine Module
      • Possible Causes
      • Diagnostic Procedure
    • P1713-Restricted Manual Valve In T2 Range
      • When Monitored and Set Condition:
        • P1713-Restricted Manual Valve In T2 Range
      • Possible Causes
      • Diagnostic Procedure
    • P1775-Solenoid Switch Valve Latched In TCC Position
      • When Monitored and Set Condition:
        • P1775-Solenoid Switch Valve Latched In TCC Position
      • Possible Causes
      • Diagnostic Procedure
    • P1776-Solenoid Switch Valve Latched In LR Position
      • When Monitored and Set Condition:
        • P1776-Solenoid Switch Valve Latched In LR Position
      • Possible Causes
      • Diagnostic Procedure
    • P1790-Fault Immediately After Shift
      • When Monitored and Set Condition:
        • P1790-Fault Immediately After Shift
      • Possible Causes
      • Diagnostic Procedure
    • P1793-TRD Link Communication Error
      • When Monitored and Set Condition:
        • P1793-TRD Link Communication Error
      • Possible Causes
      • Diagnostic Procedure
    • P1794-Speed Sensor Ground Error
      • When Monitored and Set Condition:
        • P1794-Speed Sensor Ground Error
      • Possible Causes
      • Diagnostic Procedure
    • P1797-Manual Shift Overheat
      • When Monitored and Set Condition:
        • P1797-Manual Shift Overheat
      • Possible Causes
      • Diagnostic Procedure
  • Transmission - NGC - Symptoms
    • 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 and Set Condition:
        • P0122-Throttle Position Sensor/Apps Low
      • Possible Causes
      • Diagnostic Procedure
    • P0123-Throttle Position Sensor/Apps High
      • When Monitored and Set Condition:
        • P0123-Throttle Position Sensor/Apps High
      • Possible Causes
      • Diagnostic Procedure
    • P0124-Throttle Position Sensor/Apps Intermittent
      • When Monitored and Set Condition:
        • P0124-Throttle Position Sensor/Apps Intermittent
      • Possible Causes
      • Diagnostic Procedure
    • P0218-High Temperature Operation Activated
      • When Monitored and Set Condition:
        • P0218-High Temperature Operation Activated
      • Possible Causes
      • Diagnostic Procedure
    • P0562-Low Battery Voltage
      • When Monitored and Set Condition:
        • P0562-Low Battery Voltage
      • Possible Causes
      • Diagnostic Procedure
    • P0604-Internal TCM; P0605-Internal TCM; P0613-Internal TCM
      • Notes
      • Possible Causes
      • Diagnostic Procedure
    • P0706-Check Shifter Signal
      • When Monitored and Set Condition:
        • P0706-Check Shifter Signal
      • Possible Causes
      • Diagnostic Procedure
    • P0711-Transmission Temperature Sensor Performance
      • When Monitored and Set Condition:
        • P0711-Transmission Temperature Sensor Performance
      • Possible Causes
      • Diagnostic Procedure
    • P0712-Transmission Temperature Sensor Low
      • When Monitored and Set Condition:
        • P0712-Transmission Temperature Sensor Low
      • Possible Causes
      • Diagnostic Procedure
    • P0713-Transmission Temperature Sensor High
      • When Monitored and Set Condition:
        • P0713-Transmission Temperature Sensor High
      • Possible Causes
      • Diagnostic Procedure
    • P0714-Transmission Temperature Sensor Intermittent
      • When Monitored and Set Condition:
        • P0714-Transmission Temperature Sensor Intermittent
      • Possible Causes
      • Diagnostic Procedure
    • P0715-Input Speed Sensor Error
      • When Monitored and Set Condition:
        • P0715-Input Speed Sensor Error
      • Possible Causes
      • Diagnostic Procedure
    • P0720-Output Speed Sensor Error
      • When Monitored and Set Condition:
        • P0720-Output Speed Sensor Error
      • Possible Causes
      • Diagnostic Procedure
    • P0725-Engine Speed Sensor Circuit
      • When Monitored and Set Condition:
        • P0725-Engine Speed Sensor Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0731-Gear Ratio Error In 1ST
      • When Monitored and Set Condition:
        • P0731-Gear Ratio Error In 1ST
      • Possible Causes
      • Diagnostic Procedure
    • P0732-Gear Ratio Error In 2ND
      • When Monitored and Set Condition:
        • P0732-Gear Ratio Error In 2ND
      • Possible Causes
      • Diagnostic Procedure
    • P0733-Gear Ratio Error In 3RD
      • When Monitored and Set Condition:
        • P0733-Gear Ratio Error In 3RD
      • Possible Causes
      • Diagnostic Procedure
    • P0734-Gear Ratio Error In 4TH
      • When Monitored and Set Condition:
        • P0734-Gear Ratio Error In 4TH
      • Possible Causes
      • Diagnostic Procedure
    • P0736-Gear Ratio Error In Reverse
      • When Monitored and Set Condition:
        • P0736-Gear Ratio Error In Reverse
      • Possible Causes
      • Diagnostic Procedure
    • P0740-TCC Out Of Range
      • When Monitored and Set Condition:
        • P0740-TCC Out Of Range
      • Possible Causes
      • Diagnostic Procedure
    • P0750-LR Solenoid Circuit
      • When Monitored and Set Condition:
        • P0750-LR Solenoid Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0755-2/4 Solenoid Circuit
      • When Monitored and Set Condition:
        • P0755-2/4 Solenoid Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0760-Od Solenoid Circuit
      • When Monitored and Set Condition:
        • P0760-Od Solenoid Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0765-UD Solenoid Circuit
      • When Monitored and Set Condition:
        • P0765-UD Solenoid Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0841-LR Pressure Switch Sense Circuit
      • When Monitored and Set Condition:
        • P0841-LR Pressure Switch Sense Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0845-2/4 Hydraulic Pressure Test Failure
      • When Monitored and Set Condition:
        • P0845-2/4 Hydraulic Pressure Test Failure
      • Possible Causes
      • Diagnostic Procedure
    • P0846-2/4 Pressure Switch Sense Circuit
      • When Monitored and Set Condition:
        • P0846-2/4 Pressure Switch Sense Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0868-Line Pressure Low
      • When Monitored and Set Condition:
        • P0868-Line Pressure Low
      • Possible Causes
      • Diagnostic Procedure
    • P0869-Line Pressure High
      • When Monitored and Set Condition:
        • P0869-Line Pressure High
      • Possible Causes
      • Diagnostic Procedure
    • P0870-Od Hydraulic Pressure Test Failure
      • When Monitored and Set Condition:
        • P0870-Od Hydraulic Pressure Test Failure
      • Possible Causes
      • Diagnostic Procedure
    • P0871-Od Pressure Switch Sense Circuit
      • When Monitored and Set Condition:
        • P0871-Od Pressure Switch Sense Circuit
      • Possible Causes
      • Diagnostic Procedure
    • P0882-TCM Power Input Low P0888-Relay Output Always Off
      • Notes
      • When Monitored and Set Condition:
        • P0882-TCM Power Input Low
        • P0888-Relay Output Always Off
      • Possible Causes
      • Diagnostic Procedure
    • P0883-TCM Power Input High; P0891-Transmission RLY Always On
      • Notes
      • When Monitored and Set Condition:
        • P0883-TCM Power Input High
        • P0891-Transmission RLY Always On
      • Possible Causes
      • Diagnostic Procedure
    • P0884-Power Up At Speed
      • When Monitored and Set Condition:
        • P0884-Power Up At Speed
      • Possible Causes
      • Diagnostic Procedure
    • P0890-Switched Battery
      • When Monitored and Set Condition:
        • P0890-Switched Battery
      • Possible Causes
      • Diagnostic Procedure
    • P0897-Worn Out/Burnt Transaxle Fluid
      • When Monitored and Set Condition:
        • P0897-Worn Out/Burnt Transaxle Fluid
      • Possible Causes
      • Diagnostic Procedure
    • P0932-Line Pressure Sensor Circuit Fault
      • When Monitored and Set Condition:
        • P0932-Line Pressure Sensor Circuit Fault
      • Possible Causes
      • Diagnostic Procedure
    • P0934-Line Pressure Sensor Low
      • When Monitored and Set Condition:
        • P0934-Line Pressure Sensor Low
      • Possible Causes
      • Diagnostic Procedure
    • P0935-Line Pressure Sensor High
      • When Monitored and Set Condition:
        • P0935-Line Pressure Sensor High
      • Possible Causes
      • Diagnostic Procedure
    • P0944-Loss Of Prime
      • When Monitored and Set Condition:
        • P0944-Loss Of Prime
      • Possible Causes
      • Diagnostic Procedure
    • P0952-AUTOSTICK Input Circuit Low
      • When Monitored and Set Condition:
        • P0952-AUTOSTICK Input Circuit Low
      • Possible Causes
      • Diagnostic Procedure
    • P0953-AUTOSTICK Input Circuit High
      • When Monitored and Set Condition:
        • P0953-AUTOSTICK Input Circuit High
      • Possible Causes
      • Diagnostic Procedure
    • P0992-2-4/Od Hydraulic Pressure Test Failure
      • When Monitored and Set Condition:
        • P0992-2-4/Od Hydraulic Pressure Test Failure
      • Possible Causes
      • Diagnostic Procedure
    • P1652-Serial Communication Link Malfunction
      • When Monitored and Set Condition:
        • P1652-Serial Communication Link Malfunction
      • Possible Causes
      • Diagnostic Procedure
    • P1684-Battery Was Disconnected
      • When Monitored and Set Condition:
        • P1684-Battery Was Disconnected
      • Possible Causes
      • Diagnostic Procedure
    • P1687-No Communication With The Mic
      • When Monitored and Set Condition:
        • P1687-No Communication With The Mic
      • Possible Causes
      • Diagnostic Procedure
    • P1694-Bus Communication With Engine Module
      • When Monitored and Set Condition:
        • P1694-Bus Communication With Engine Module
      • Possible Causes
      • Diagnostic Procedure
    • P1713-Restricted Manual Valve In T2 Range
      • When Monitored and Set Condition:
        • P1713-Restricted Manual Valve In T2 Range
      • Possible Causes
      • Diagnostic Procedure
    • P1745-Transmission Line Pressure Too High For Too Long
      • When Monitored and Set Condition:
        • P1745-Transmission Line Pressure Too High For Too Long
      • Possible Causes
      • Diagnostic Procedure
    • P1775-Solenoid Switch Valve Latched In TCC Position
      • When Monitored and Set Condition:
        • P1775-Solenoid Switch Valve Latched In TCC Position
      • Possible Causes
      • Diagnostic Procedure
    • P1776-Solenoid Switch Valve Latched In LR Position
      • When Monitored and Set Condition:
        • P1776-Solenoid Switch Valve Latched In LR Position
      • Possible Causes
      • Diagnostic Procedure
    • P1790-Fault Immediately After Shift
      • When Monitored and Set Condition:
        • P1790-Fault Immediately After Shift
      • Possible Causes
      • Diagnostic Procedure
    • P1793-TRD Link Communication Error
      • When Monitored and Set Condition:
        • P1793-TRD Link Communication Error
      • Possible Causes
      • Diagnostic Procedure
    • P1794-Speed Sensor Ground Error
      • When Monitored and Set Condition:
        • P1794-Speed Sensor Ground Error
      • Possible Causes
      • Diagnostic Procedure
    • P1797-Manual Shift Overheat
      • When Monitored and Set Condition:
        • P1797-Manual Shift Overheat
      • Possible Causes
      • Diagnostic Procedure
  • Verification Tests
    • Verification Tests
• Component Locations
  • Control Module Locations
    • ECM - Diesel
    • TCM-EATX
    • Pcm-NGC
  • Pressure Port Locations
  • Transmission Component Locations
• Connector PINOUTS
• Schematic Diagrams
  • Pcm-NGC-Gas
  • TCM- EATX- Diesel
• Charts And Graphs
  • Transmission Range Sensor States
  • Pressure Switch States
  • Solenoid Application Chart
  • Shift Lever Error Codes
  • Transmission Temperature Sensor