Possible Causes & Corrections

Check the following items:

• Check engine shutoff solenoid operation. Check electrical connections.
• Check air filter, turbocharger and air intake system for a restriction.
• Check glow plug operation. Check and/or replace glow plugs or controls.
• Check for plugged fuel return system for restrictions.
• Check fuel cap vent.
• Check for slow engine cranking.
• Check engine for low compression. Check for incorrect valve timing, bent push rods, broken valve springs or worn camshaft lobes.
• Inspect fuel delivery system. Check for no fuel to injection pump or air in fuel system. See BASIC FUEL SYSTEM CHECKS (DIESEL) in appropriate BASIC DIAGNOSTIC PROCEDURES article.
• Inspect the fuel pressure regulator 12-volt circuit for an intermittent short to ground. Observe the FRP command percent while cranking. A range of 85-95 percent indicates a possible short to ground condition.
• Check for incorrect or contaminated fuel.
• Check for incorrect pump timing. See appropriate SELF-DIAGNOSTICS article.
• Check Engine Coolant Temperature (ECT) sensor, Reading should be within 5°F of ambient air temperature on a cold engine.
• Inspect the Fuel Rail Pressure (FRP) sensor. Use scan tool to observe FRP with engine off. FRP should be 1.1-1.4 MPa. If not, inspect for high resistance in the low reference, 5-volt reference circuits, or the FRP sensor.
• Inspect the Crankshaft Position (CKP) sensor reluctor wheel. Remove CKP sensor and attempt to move reluctor wheel front to back or side to side with a probe. If there is any movement the reluctor wheel retaining bolts are loose.