Engine Cranks But Does Not Run EFI
Circuit Description
This table assumes that battery condition and engine cranking speed is OK, quantity and quality of fuel is OK and glow plug system is operating OK.
Diagnostic Aids
If no trouble is found and the cause of an Engine Cranks But Will Not Run has not been found, check for:
| • | Proper cranking speed, 100 RPMs cold - 180 RPMs hot (a scan tool can be used to check cranking speed by pulling the FUEL SOL fuse and monitoring Engine Speed on scan tool while cranking). |
| • | Water or foreign material in fuel system. |
| • | Basic engine problem. |
If the Crankshaft position sensor and the Optical/Fuel Temperature are disconnected or malfunctioning at the same time, a Engine Cranks But Will Not Run condition will exist.
Test Description
The number(s) below refer to the step number(s) on the Diagnostic Table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | This chart assumes that all basic engine problems have been checked (low compression, damage parts). Have all basic engine problems been checked? | -- | Refer to Engine Mechanical | |
2 | Check for proper condition of batteries. Refer to Engine Electrical. Is the condition of batteries OK? | -- | ||
3 | Check for adequate fuel in the tank. Is the fuel at an adequate level? | -- | ||
4 | Check the quality of fuel. Refer to Fuel Quality Diagnosis . Is the fuel quality OK? | -- | ||
5 | Check the glow plug system operation. Refer to Glow Plug System Check . Are the glow plugs operating OK? | -- | ||
Check for proper cranking speed. Refer to Engine Electrical. Is the cranking speed OK? | -- | |||
7 | Check for a restriction in the fuel return system. Refer to Fuel Return System Diagnosis . Does the fuel return system operate properly? | -- | ||
8 |
Is there fuel at the each injection line? | -- | ||
9 | Check for proper operation of Engine Shutdown Solenoid. Refer to Fuel Injection System Diagnosis . Is the Engine Shutdown solenoid working properly? | -- | ||
10 | Replace the fuel injection pump. Refer to Fuel Injection Pump Replacement . Is the action complete? | -- | -- | |
11 | The injection system is OK. Refer to Symptoms . Is the action complete? | -- | Fuel System OK | -- |
12 | Make the appropriate repairs. Is the action complete? | -- | -- | |
13 | Attempt to start the engine. Does the engine start and continue to run? | -- | System OK |
Engine Cranks But Does Not Run MFI
Circuit Description
This table assumes that battery condition and engine cranking speed is OK, quantity and quality of fuel is OK and glow plug system is operating OK.
Diagnostic Aids
If no trouble is found and the cause of an Engine Cranks But Will Not Run has not been found, check for:
| • | Proper cranking speed, 100 RPMs cold - 180 RPMs hot . |
| • | Water or foreign material in fuel system. |
| • | Basic engine problem. |
Test Description
The number(s) below refer to the step number(s) on the Diagnostic Table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | This chart assumes that all basic engine problems have been checked (low compression, damage parts). Have all basic engine problems been checked? | -- | Refer to Engine Mechanical | |
2 | Check for proper condition of batteries. Refer to Engine Electrical. Is the condition of batteries OK? | -- | ||
3 | Check for adequate fuel in the tank. Is the fuel at an adequate level? | -- | ||
4 | Check the quality of fuel. Refer to Fuel Quality Diagnosis . Is the fuel quality OK? | -- | ||
5 | Check the glow plug system operation. Refer to Glow Plug System Check . Are the glow plugs operating OK? | -- | ||
Check for proper cranking speed. Refer to Engine Electrical. Is the cranking speed OK? | -- | |||
7 | Check for a restriction in the fuel return system. Refer to Fuel Return System Diagnosis . Does the fuel return system operate properly? | -- | ||
8 |
Is there fuel at the each injection line? | -- | ||
9 | Check for proper operation of Engine Shutdown Solenoid. Refer to Fuel Injection System Diagnosis . Is the Engine Shutdown solenoid working properly? | -- | ||
10 | Replace the fuel injection pump. Refer to Fuel Injection Pump Replacement . Is the action complete? | -- | -- | |
11 | The injection system is OK. Refer to Symptoms . Is the action complete? | -- | Fuel System OK | -- |
12 | Make the appropriate repairs. Is the action complete? | -- | -- | |
13 | Attempt to start the engine. Does the engine start and continue to run? | -- | System OK |
