Engine Cranking Speed Test C/K
Tools Required
Scan Tool Tech 2
Diagnostic Scan Tool
Important: Cranking speed is critical for a diesel engine to start, whether the
engine is hot or cold. The only approved method of testing cranking speed
is to use a Tech 2 Diagnostic Scan Tool.
- Ensure that the vehicle's batteries are in good condition, and
fully charged. Refer toBattery Load Test
in Engine Electrical.
- Remove the fuel solenoid fuse. Refer toEngine Controls Component Views
in Engine Controls.
- Connect theScan Tool
Tech 2 Diagnostic Scan Tool.
- Crank the engine for 2 to 4 seconds. This will allow the starter
to reach it's maximum performance.
- Observe the engine RPM reading on the Tech 2 Diagnostic Scan Tool.
Refer toEngine Mechanical Specifications
in Engine Mechanical. The actual cranking speed needed for starting
will vary depending on the condition of the engine mechanical components
(compression), and the condition of the fuel system components (fuel
injection pump operating pressure, and fuel injection nozzles cracking
pressure and spray pattern).
- If the engine fails to meet the minimum specified cranking speed,
repair or replace damaged or malfunctioning components and retest.
- Disconnect the Tech 2 Diagnostic Scan Tool.
- Install the fuel solenoid fuse. Refer toEngine Controls Component Views
in Engine
Controls.