A Symptom Diagnosis

SYMPTOM DIAGNOSIS - Standard Models (Non Alternative Fuels)

IMPORTANT: The following steps must be completed before using the symptom tables.

1. Perform Diagnostic System Check - Instrument Cluster before using the Symptom Tables in order to verify that all of the following are true: Diagnostic System Check - Instrument Panel Cluster
^ There are no DTCs set.
^ The control module(s) can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following:
^ Instrument Panel Cluster (IPC) Description and Operation
^ Indicator/Warning Message Description and Operation
^ Audible Warnings Description and Operation

Visual/physical Inspection
^ Inspect for aftermarket devices which could affect the operation of the Instrument Cluster or Audible Warning Systems. Refer to Checking Aftermarket Accessories in Diagrams.
^ Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
^ Inspect the reservoirs for the proper fluid level before beginning diagnosis.
^ Inspect the applicable reservoir for the proper fluid level related to the indicator or message.
^ Verify that the indicators work properly during the bulb check.

Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent and Poor Connections in Diagrams.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

Gauges and PRNDL Display
^ Gages Inoperative All
^ Engine Coolant Temperature Gage Inaccurate or Inoperative
^ Engine Oil Pressure Gage Inaccurate or Inoperative
^ Fuel Gage Inaccurate or Inoperative (Gas) or Fuel Gage Inaccurate or Inoperative (Diesel)
^ Volt Gage Inaccurate or Inoperative
^ Speedometer and/or Odometer Inaccurate or Inoperative (Gas) or Speedometer and/or Odometer Inaccurate or Inoperative (Diesel)
^ Range Selector Display Inoperative or Displays Incorrect Range in Transmission 4L60E Shift Lever Indicates Wrong Gear
^ Range Selector Display Inoperative or Displays Incorrect Range (Gas) or Range Selector Display Inoperative or Displays Incorrect Range (Diesel) in Transmission 4L80E Shift Lever Indicates Wrong Gear

Indicators
^ ABS Indicator Always On (Domestic) or ABS Indicator Always On (Export) in Anti lock Brakes System A Symptoms - Antilock Brake System
^ ABS Indicator Inoperative in Antilock Brake System A Symptoms - Antilock Brake System
^ Air Bag Indicator Always On in Restraint Systems Testing and Inspection
^ Air Bag Indicator Does Not Come ON in Restraint Systems Testing and Inspection
^ Charge Indicator Always On in Starting and Charging Testing and Inspection
^ Charge Indicator Inoperative in Starting and Charging Testing and Inspection
^ Brake Warning Indicator Always On (Without DRLs) or Brake Warning Indicator Always On (DRL equipped) in Hydraulic Brakes Symptom Related Diagnostic Procedures
^ Brake Warning Indicator Inoperative (DRL Equipped) or Brake Warning Indicator Inoperative (Without DRLs) in Hydraulic Brakes Symptom Related Diagnostic Procedures
^ Low Engine Coolant Indicator Always On in Cooling System Symptom Related Diagnostic Procedures
^ Malfunction Indicator Lamp (MIL) Inoperative in Computers and Controls Systems - 4.3L
^ Malfunction Indicator Lamp (MIL) Always On in Computers and Controls Systems - 4.3L
^ Malfunction Indicator Lamp (MIL) Always On in Computers and Controls Systems - 5.0L and 5.7L
^ Malfunction Indicator Lamp (MIL) Inoperative in Computers and Controls Systems - 5.0L and 5.7L
^ Fasten Safety Belt Indicator/Chime Always On in Seat Belts Testing and Inspection
^ Fasten Safety Belt Indicator/Chime Inoperative in Seat Belts Testing and Inspection
^ High Beam Indicator Inoperative in Lighting and Horns Testing and Inspection
^ Turn Signal Lamps and/or Indicators Always On or Flashing in Lighting and Horns Testing and Inspection
^ Turn Signal Lamps and/or Indicators Inoperative in Lighting and Horns Testing and Inspection
^ Water-in-Fuel Lamp Always On in Computers and Controls Systems 6.5L Testing and Inspection
^ Water-in-Fuel Lamp Inoperative in Computers and Controls Systems 6.5L Testing and Inspection

Instrument Cluster Dimming
^ Interior Backlighting Does Not Dim in Lighting and Horns Testing and Inspection
^ Interior Backlighting Inoperative in Lighting and Horns Testing and Inspection

Audible Warning
^ Chime Always On
^ Chime Inoperative