Engine Cranks, But Will Not Run

Diagnostic Chart:

Wiring Diagram:

Circuit Description

This chart 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

Number(s) below refer to the step number(s) on the Diagnostic Table.

6. This step checks for proper cranking speed (see Diagnostic Aids).

8. This step will check the ground wire on the injection pump (wire located on top of pump).

12. This step will determine if the injection pump or wiring is at fault.