Automatic Transmission Diagnostic Procedures

• Introduction
  • Notes
  • System Coverage
  • Six-Step Trouble Shooting Procedure
• Identification Of System
• System Description And Functional Operation
  • General Description
    • Powertrain
    • Transmission
    • Transfer Case
  • Function Operation
    • Fuel Control (Gas)
    • On-Board Diagnostics
      • Notes
      • 2003 Mil Lamp Strategy
    • JTEC Controlled Rear Wheel Drive Vehicles
    • Monitor Run Process
    • OBDII Monitor Run Process NGC Vehicles
    • Transmission Control
      • Notes
      • Transmission Operation And Shift Scheduling At Various Oil Temperatures
      • Line Pressure Control
      • Typical Line Pressure Problems Include:
      • Drive Learn Procedure
        • Procedure To Learn A Smooth 1ST Neutral To Drive Shift:
        • Procedure To Learn A Smooth Neutral To Drive Garage Shift:
        • Procedure To Learn The 1ST 2-3 Shift After A Restart Or Shift To Reverse:
        • Procedure To Learn A Smooth 2-3 And 3-4 Upshift:
        • Procedure To Learn A Smooth 4-3 COASTDOWN And Part Throttle 4-3 KICKDOWN:
        • Procedure To Learn A Smooth 1-2 Upshift And 3-2 KICKDOWN:
        • Procedure To Learn A Smooth Manual 2-1 PULLDOWN Shift As Well As A Neutral To Reverse Shift:
        • Procedure To Learn A Smooth Neutral To Reverse Shift:
        • Procedure To Learn A Smooth 4--5 Upshift For 545RFE:
    • Transmission Control (Re)
      • Notes
      • Transmission Identification
      • Governor Pressure Solenoid Valve
      • Governor Pressure Sensor
      • Governor Shift Schedules
      • Low Transmission Fluid Temperature
      • Transfer Case Low-Range Operation
      • Wide-Open Throttle Operation
      • Normal Operation
      • Governor Operation
      • Transmission Temperature Sensor
      • Transmission Output Shaft Speed Sensor
      • Torque Converter Electronics
    • O2 Sensor (NGC)
    • Other Controls
      • Charging System (NGC)
      • Vehicle Speed Control (NGC)
      • Leak Detection Pump Operation
      • EVAP Leak Detection System Components
      • LDP At Rest (Not Powered)
      • Diaphragm Upward Movement
      • Diaphragm Downward Movement
      • Pumping Action
      • Enabling Conditions To Run EVAP Leak Detection Test
      • Section 1: P1495 - Leak Detection Pump Solenoid Circuit Can Set (Key "On")
      • Section 2: P1494 - Leak Detection Pump Switch Or Mechanical Fault Can Set
      • Section 3: P1486 - EVAP Leak Monitor Pinched Hose Found Can Set
      • Section 4: No DTC Can Set During This Time
      • Section 5: P0456 - EVAP Leak Monitor 0.020 Leak Detected; P0442 - EVAP Leak Monitor 0.040 Leak Detected; P0455 - EVAP Leak Monitor Large Leak Detected Can Set (Times Will Vary)
      • Diagnostic Tips
      • Test Equipment
      • Important
      • Natural Vacuum Leak Detection (NVLD)
    • Non-Monitored Circuits
    • Diagnostic Trouble Codes
    • Hard Code
      • Powertrain
      • Transmission
    • One Trip Failure
    • Intermittent Code
    • Starts Since Set Counter
      • Powertrain
      • Transmission
    • Trouble Code Erasure
    • Quick Learn
      • Notes
      • Notes About The Quick Learn Features
    • Clutch Volumes
    • No Start Information (Powertrain)
      • Important Note:
      • For Abs And Air Bag Systems:
      • For Skim Theft Alarm:
  • Using The DRBIII®
  • DRBIII® Error Messages And Blank Screen
    • Notes
    • DRBIII® Does Not Power Up
    • Display Is Not Visible
    • Some Display Items Read
    • Transmission Simulator (Miller Tool #8333)
• Disclaimers, Safety, Warnings
  • Disclaimers
  • Safety
    • Technician Safety Information
    • Vehicle Preparation For Testing
    • Servicing Sub-Assemblies
    • DRBIII® Safety Information
  • Warnings And Cautions
    • Road Test Warnings
    • Vehicle Damage Warnings
    • Road Testing A Complaint Vehicle (Transmission)
    • Electronic Pinion Factor Warnings (If Applicable)
    • Bulletins And Recalls
• Required Tools And Equipment
• Acronyms
  • Notes
  • Definitions
• Communication - Symptoms
  • Symptom: *NO RESPONSE FROM PCM (PCI BUS) - NGC
    • Possible Causes
    • Diagnostic Procedure
  • Symptom: *NO RESPONSE FROM PCM (PCM SCI ONLY) - NGC
    • Possible Causes
    • Diagnostic Procedure
  • Symptom: *NO RESPONSE FROM SENTRY KEY IMMOBILIZER MODULE
    • Possible Causes
    • Diagnostic Procedure
  • Symptom: *NO RESPONSE FROM TRANSFER CASE CONTROL MODULE
    • Possible Causes
    • Diagnostic Procedure
  • Symptom: *NO RESPONSE FROM TRANSMISSION CONTROL MODULE - NGC
    • Possible Causes
    • Diagnostic Procedure
  • Symptom: *PCI BUS COMMUNICATION FAILURE
    • Possible Causes
    • Diagnostic Procedure
• Transfer Case - Electronic - Symptoms
  • Symptom: 12 VOLT OVER VOLTAGE
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: 2WD/AWD INDICATOR OPEN
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: 2WD/AWD INDICATOR SHORT TO GROUND
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: 4WD HI INDICATOR OPEN
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: 4WD HI INDICATOR SHORT TO GROUND
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: 4WD LO INDICATOR OPEN
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: 4WD LO INDICATOR SHORT TO GROUND
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: 5 VOLT OVER VOLTAGE
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: 5 VOLT UNDER VOLTAGE
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: INTERNAL ERROR
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: MISSING BRAKE INPUT
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: MISSING ENGINE RPM INPUT
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: MISSING IGNITION MESSAGE
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: MISSING LAMP DIMMING MESSAGE
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: MISSING TRANSMISSION POSITION INPUT
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: MISSING VEHICLE SPEED INPUT
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: NEUTRAL INDICATOR OPEN
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: NEUTRAL INDICATOR SHORT TO GROUND
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: TRANSFER CASE MODE SENSOR ERROR
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: TRANSFER CASE SELECTOR SWITCH ERROR
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
• Transmission - NGC - Symptoms
  • Symptom: *BACKUP LAMPS COME ON WHILE SHIFTER IS NOT IN REVERSE POSITION
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: *BACKUP LAMPS INOPERATIVE
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: *BUMP FELT SHORTLY AFTER STOP WITH NO DTC'S PRESENT
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: *BUMP FELT WHILE COASTING IN NEUTRAL WITH NO DTC'S PRESENT
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: *POOR SHIFT QUALITY
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: *TRANSMISSION NOISY WITH NO DTC'S PRESENT
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: *TRANSMISSION SHIFTS EARLY WITH NO DTC'S
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: *TRANSMISSION SHIFTS ROUGH AFTER PCM REPLACEMENT OR REFLASH
    • Possible Cause
    • Diagnostic Procedure
  • Symptom: *TRANSMISSION SIMULATOR WILL NOT POWER UP
    • Diagnostic Procedure
  • Symptom: *VEHICLE IS SLUGGISH WITH NO DTC'S PRESENT
    • Possible Cause
    • Diagnostic Procedure
• Transmission - NGC - Diagnostic Tests
  • Notes
  • P0122-Throttle Position Sensor Low
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0123-Throttle Position Sensor High
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0124-Throttle Position Sensor Intermittent
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0218-High Temperature Operation Activated
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0562-Low Battery Voltage
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0604-Internal TCM
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0605-Internal TCM
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0613-Internal TCM
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0706-Check Shifter Signal
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0711-Transmission Temperature Sensor Performance
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0712-Transmission Temperature Sensor Low
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0713-Transmission Temperature Sensor High
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0714-Transmission Temperature Sensor Intermittent
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0715-Input Speed Sensor Error
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0720-Output Speed Sensor Error
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0725-Engine Speed Sensor Circuit
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0731-Gear Ratio Error In 1ST
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0732-Gear Ratio Error In 2ND
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0733-Gear Ratio Error In 3RD
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0734-Gear Ratio Error In 4TH
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0735-Gear Ratio Error 4TH Prime
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0736-Gear Ratio Error In Reverse
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0740-Torque Converter Clutch Control Circuit
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0750-LR Solenoid Circuit
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0755-2C Solenoid Circuit
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0760-Od Solenoid Circuit
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0765-UD Solenoid Circuit
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0770-4C Solenoid Circuit
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0841-LR Pressure Switch Sense Circuit
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0845-2C Hydraulic Pressure Test Failure
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0846-2C Pressure Switch Sense Circuit
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0868-Line Pressure Low
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0869-Line Pressure High
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0870-Od Hydraulic Pressure Test Failure
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0871-Od Pressure Switch Sense Circuit
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0875-UD Hydraulic Pressure Test Failure
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0876-UD Pressure Switch Sense Circuit
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0884-Power Up At Speed
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0888-Relay Output Always Off
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0890-Switched Battery
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0891-Transmission Relay Always On
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0932-Line Pressure Sensor Circuit Fault
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0934-Line Pressure Sensor Low
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0935-Line Pressure Sensor High
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0944-Loss Of Prime
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0987-4C Hydraulic Pressure Test Failure
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0988-4C Pressure Switch Sense Circuit
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P1684-Battery Was Disconnected
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P1694-Bus Communication With Engine Module
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P1715-Restricted Port In T3 Range
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P1736-Gear Ratio Error In 2ND Prime
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P1775-Solenoid Switch Valve Latched In TCC Position
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P1776-Solenoid Switch Valve Latched In LR Position
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P1790-Fault Immediately After Shift
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P1793-TRD Link Communication Error
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P1794-Speed Sensor Ground Error
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P2700-Inadequate Element Volume LR
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P2701-Inadequate Element Volume 2C
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P2702-Inadequate Element Volume Od
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P2703- Inadequate Element Volume UD
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P2704-Inadequate Element Volume 4C
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P2706-Ms Solenoid Circuit
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
• Transmission - Re - Diagnostic Tests
  • Notes
  • P0711-Trans Temp Sensor, No Temp Rise After Start
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0712-Trans Temp Sensor Voltage Too Low
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0713-Trans Temp Sensor Voltage Too High
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0720-Low Output Speed Sensor - Rpm Above 15 Mph
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0743-Torque Converter Clutch Solenoid/Trans Relay Circuits
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0748-Pressure SQL Control/Trans Relay Circuits
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0751-O/D Switch Pressed (Lo) More Than 5 Minutes
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P0753-Trans 3-4 Shift Sol/Trans Relay Circuits
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P1740-TCC O/D Sol Performance
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P1756-Gov Press Not Equal To Target @ 15-20 Psi; P1756-Gov Press Not Equal To Target @ 35-40 Psi (Diesel)
    • Notes
    • When Monitored and Set Condition:
      • P1756-Gov Press Not Equal To Target @ 15-20 Psi
      • P1756-Gov Press Not Equal To Target @ 35-40 Psi (Diesel)
    • Possible Cause
    • Diagnostic Procedure
  • P1757-Gov Press Above 3 Psi In Gear With 0 Mph
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P1762-Gov Press Sen Offset Volts Too Lo Or High
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P1763-Governor Pressure Sensor Volts Too Hi
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P1764-Governor Pressure Sensor Volts Too Low
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
  • P1765-Trans 12 Volt Supply Relay CTRL Circuit
    • When Monitored and Set Condition:
    • Possible Cause
    • Diagnostic Procedure
• Verification Tests
  • (NGC) 45RFE/545RFE Transmission Verification Test VER-1
  • Transfer Case Verification Test
  • Transmission No Trouble Code Verification Test
  • Transmission Verification Test VER-1
• Component Locations
• Connector PINOUTS
• Schematic Diagrams
• Charts & Graphs
  • Pressure Switch States
  • Shift Lever Error Codes
  • Transmission Range Sensor Switch