0397590 JOHNSON IMPELLER HSG.

Probable Causes
Check for Diagnostic codes and event codes
Slow cranking speed
Battery condition
Keyswitch power to the Electronic Control Module (ECM) and the Fuel Control Valve
ECM supply voltage
Engine speed/timing signal
Low-pressure fuel system
High-pressure fuel system
Fuel quality
Gear train problemRecommended Actions
Table 1
Troubleshooting Test Steps Values Results
1. Check for Diagnostic Codes and Event Codes
A. Connect Caterpillar Electronic Technician (ET) to the service tool connector. Check for active diagnostic codes and event codes.
1. Look for active diagnostic codes or active event codes that are related to the following items:
- Low-pressure fuel system
- High-pressure fuel system
- Engine speed/timing sensors
- Shutdown devices
2. Check for event codes that are logged repeatedly. Repeated codes may be evidence of an impending problem. Check for logged events that have a severity of level 3.
3. Use