Flow Of Diagnosis

The customer complaint will tell you which test to use. Use only that category of tests. When the customer complaint is the power loss lamp is on, only perform the limp-in mode category. There is no need to go through the warm driveability tests.
It is very important that you get an accurate description of the customer complaint. Verify this complaint by road testing the vehicle.
Perform a visual check, many problems are caused by loose connectors, frayed insulation, loose hose clamps, leaks in vacuum or fuel lines. Performing a short visual inspection will help spot these most common faults and save a lot of unnecessary test and diagnostic time.
The test sequence is broken down into seven categories:
1. Visual Inspection
2. No Start Test
3. Hard Start/Start And Stall/Excessive Idle Test
4. Limp-In Mode Test
5. Driveability Test Cold
6. Driveability Test Warm
7. Driveability Test-Fault Codes