Engine Controls - Tests W/Codes - V6

• Introduction
  • Notes
  • Self-Diagnostic System
    • Hard Failures
    • Intermittent Failures
  • Retrieving Diagnostic Codes
    • Notes
    • Normal Mode
    • Test Mode
  • Notes On Diagnostic Codes
  • Clearing Diagnostic Codes
  • ECM Location
• Summary
• Diagnostic Code Diagnostic Hints
• Diagnostic Code Identification
• Diagnostic Code Charts
  • Notes
  • Ecu Terminal Identification
  • Diagnostic Circuit Check
  • Test 1 - Ecu (+B) Circuit
  • Code 12, 13 - Rpm Signal
  • Code 14/Test 2 - Ignition Signal
  • Code 16 - Electronic-Controlled A/T Signal
  • Code 21/Test 3 - Oxygen Sensor Signal
  • Code 22/Test 4 - Coolant Temperature Sensor Signal
  • Code 24, 31, 32/Test 5 - IAT Sensor & Airflow Meter Sig.
  • Code 25 - Lean Air/Fuel Mixture
    • Probable Causes:
  • Code 26 - Rich Air/Fuel Mixture
    • Probable Causes:
  • Code 35 - High Alt. COMPENSATOR Sensor Signal (Cab & Chassis)
    • Probable Causes:
  • Code 41/Test 6 - Throttle Position Sensor Signal
  • Code 42 - Vehicle Speed Sensor Signal
    • Probable Causes:
  • Code 43/Test 7 - Starter Signal
  • Code 51 - Switch Signal
    • Probable Causes:
  • Code 52 - Knock Sensor Signal
    • Probable Causes:
  • Code 53 - Knock Sensor Control (Ecu)
    • Probable Causes:
  • Code 71/Test 8 - EGR System Malfunction
  • Test 9 - Injector Circuit
  • Test 10 - Cold Start Injector Circuit
  • Test 11 - Check Engine Light Circuit
  • Test 12 - Stoplight Switch Circuit