Engine Controls - Tests W/Codes - V6

• Introduction
• Self-Diagnostic System
  • Notes
  • Engine Controls - Tests W/Codes - V6
    • Hard Failures
    • Intermittent Failures
  • Diagnostic Procedure
  • Retrieving Codes (Non-Scan)
  • Reading Trouble Codes
  • Hard Or Intermittent Trouble Code Determination
  • Clearing Trouble Codes
  • ECM Location
  • Diagnostic Materials
    • Diagnostic Aids
    • Field Service Mode Check
  • Special Tools (Diagnostic)
  • Scan Tester Usage
  • Scan Data
  • Summary
• Trouble Code Charts
  • Notes
  • Code 13, Open Oxygen Sensor Circuit
    • Except 4.3L Turbo
    • Diagnostic Aids
    • 4.3L Turbo
  • Code 14, Coolant Sensor Signal Voltage Low
    • Notes
    • Diagnostic Aids
  • Code 15, Coolant Sensor Signal Voltage High
    • Notes
    • Diagnostic Aids
  • Code 21, TPS Signal Voltage High
    • Notes
    • Diagnostic Aids
  • Code 22, TPS Signal Voltage Low
    • Notes
    • Diagnostic Aids
  • Code 23, Mat Sensor Temp. Low
    • 2.5L & 4.3L Turbo
    • Diagnostic Aids
  • Code 24, Vehicle Speed Sensor
    • Except 3.1L, C & K Series & Models W/4L80-E Transmission
    • Diagnostic Aids
    • C & K Series Except With 4L80-E Transmission
    • C & K Series 2WD With 4L80-E Transmission
    • 2WD With 4L80-E Trans. Except C & K Series
    • 4WD With 4L80-E Transmission
    • 3.1L Engine
  • Code 25, Mat Sensor Temp. High
    • 2.5L & 4.3L Turbo
    • Diagnostic Aids
  • Code 31, Turbo OVERBOOST (4.3L Turbo)
  • Code 32, EGR System Error
    • 4.3L C, G, K, & P Series W/4L80-E Transmission
    • Diagnostic Aids
    • All Engines With 4L80-E Trans. Except 4.3L
    • All W/O 4L80-E Trans Except 3.1L, & 4.3L Turbo
    • 3.1L Engine
    • 4.3L Turbo
  • Code 32, EGR System Error - 4.3L With Linear EGR
    • Notes
    • Diagnostic Aids
  • Code 33, Map Sensor Signal Voltage High
    • Notes
    • Diagnostic Aids
  • Code 34, Map Sensor Signal Voltage Low
    • Notes
    • Diagnostic Aids
  • Code 35, Idle Speed Error 2.5L & 4.3L Turbo
    • Notes
    • IAC Valve Reset Procedure
    • Diagnostic Aids
    • System Too Lean
    • System Too Rich
    • Throttle Body
    • IAC Valve Connections
    • PCV Valve
  • Code 42, Electronic Spark Timing (Est)
    • Notes
    • Diagnostic Aids
  • Code 43, Electronic Spark Control
    • Knock Sensor W/O Spark Module (Dual Sensors) - "L", "M", "S" & "T" Series
    • Diagnostic Aids
    • All Except 4.3L Turbo & Models With 4L80-E Transmission
    • 4.3L Turbo & Models With 4L80-E Transmission
  • Code 44, Lean Exhaust Indication
    • Except 4.3L Turbo
    • Diagnostic Aids
    • O2 Sensor Wire
    • Fuel Contamination
    • Fuel Pressure
    • Exhaust Leaks
    • 4.3L Turbo
  • Code 45, Rich Exhaust Indication
    • Except 4.3L Turbo
    • Diagnostic Aids
    • Fuel Pressure High
    • Ignition Ground
    • Fuel Canister
    • MAP Sensor
    • TPS
    • O2 Sensor Contamination
    • EGR Problem
    • 4.3L Turbo
  • Code 51, Faulty Prom/Mem-Cal
  • Code 52, Faulty CALPAK (Except 2.5L)
  • Code 53, System OVERVOLTAGE (2.5L)
  • Code 54, Fuel Pump Circuit
  • Code 55, ECM Error (Except 2.5L)