4.9L MCU Testing
- Diagnosis & Testing
- Notes
- Preparation For Testing
- 4-Cylinder Functional Test
- Instructions For Using The Sub-Routine Tests
- Test 1 - No Start
- Test 2 - Code 25/Knock Detection
- Test 3 - Code 33/Running Test Not Initiated
- Test 4 - Code 41/Fuel Always Lean
- Test 5 - Code 42/Fuel Always Rich
- Test 6 - Code 44/THERMACTOR System
- Test 7 - Code 45/THERMACTOR Air Diverter
- Test 8 - Code 46/THERMACTOR Air By-Pass
- Test 9 - Code 53/Low Temperature Switch
- Test 10 - Vacuum Switches (Codes 52, 54, 55, 62, 64 & 65)
- Test 11 - No Codes (Functional Test Not Operating)
- Test 12 - Spark Retard Solenoid
- Wiring Diagrams