No Start Diagnostics
NOTE: No start issues occur when the engine cranks but does not start.
|
Checks |
Action |
|
Preliminary Checks |
N/A |
|
ECU Checks |
- Check for proper communication with the ECU - Check all fuses and relays for any damage - Check battery power, ignition power and ground circuits to the ECU |
|
Sensor Checks |
- Check the MAP sensor - Check the cam sensor for proper RPM output |
|
Fuel System Checks |
- Check the air intake components for any leakage - Check for proper fuel pressure |
|
Ignition System Checks |
- Check for proper ignition voltage output - Check the spark plugs for proper gap, cracks, heavy deposits, wet plugs, wear, and ensure to also check the ignition wires |
|
Engine Mechanical Checks |
Check for all of the below items: - Vacuum leaks - Improper valve timing - Low compression - Worn rocker arms - Improper valve clearance - Broken or weak valve springs - Worn camshaft lobes |
|
Exhaust System Checks |
Check for all of the below conditions: - Inspect the exhaust system for damaged or collapsed pipes - Check for plugged catalytic converter |
Table 58. No Start Diagnostics Table
