MANIFOLD-OIL 7G3205 - Caterpillar

Adaptable To:
Table 2
Application     Software    
793F High altitude arrangement     291-5485 Engine Ratings Electronic Software Gp    
793F Low altitude arrangement     397-6107 Engine Ratings Electronic Software Gp    
795F Series AC     397-6108 Engine Ratings Electronic Software Gp    
797F High altitude arrangement     291-5550 Engine Ratings Electronic Software Gp    
797F Low altitude arrangement     397-6106 Engine Ratings Electronic Software Gp    
797B Retrofit     384-7075 Engine Ratings Electronic Software Gp    Troubleshooting the -5 Cylinder Injector : Current Below Normal Code
Illustration 1 g01336507
Schematic for the 16-cylinder injectors
Illustration 2 g01336555
Schematic for the 20-cylinder injectors
Electrical Shock Hazard. The unit injector system uses 90 - 120 volts. The ECM sends this signal to the unit injectors. Do not come in contact with the unit injector harness connector while the engine is operating. Failure to follow this instruction could resulting in personal injury or death.
Table 3
Troubleshooting Test Steps    Value    Result    
A. Check for an Intermittent High Resistance Short Circuit to Ground.
1. Disconnect the rail harness from the ECM. Inspect the connectors and terminals for moisture, corrosion, and other damage. Inspect the condition of the wires. Perform a
45 N (10 lb) pull test on the wires.
    Connectors and wiring     Result: A problem with the connectors or wiring is found..
Repair the parts, as needed.
Stop
Result: The connectors and wiring appear to be OK.
Proceed to the next test step.    
2. On the rail harness, locate any one of the three terminals for the two injectors that have the -5 code.
3. Measure the resistance from the terminal on the rail harness to chassis ground. Ensure that the ground connection is good.     Resistance     Result: The resistance is 10,000 ohms or greater than 10,000 ohms. A short circuit was not detected.
Proceed to the next test step.
Result: The resistance is less than 10,000. A short circuit was detected.
Proceed to step A.5.    
4. On the rail harness, again locate any one of the three terminals for the two injectors that have the -5 code. Wiggle the wires while monitoring the ohmmeter for a change in resistance.     Change in resistance     Result: The resistance changes. A short circuit was detected.
Proceed to the next test step.
Result: The resistance does not change. No short circuit was detected.
Proceed to step B. Check for Open Circuits.    
5. Disconnect the harness connectors from the valve covers of the injectors with the -5 code.
6. From the connector on the valve cover, measure the resistance between one terminal for each suspect injector to ground.     Resistance     Result: The resistance is .10,000 ohms or greater than 10,000 ohms. The wiring under the valve cover is OK. There is a short circuit in the rail harness.
Repair: Determine which wire in the circuit is shorted. Repair the wire or replace the wire.
Stop
Result: The resistance is less than 10,000 ohms.
Repair: The problem is under the valve cover, most likely in the wiring.
Remove the valve cover for the suspect injector.
Disconnect the wiring from the injector.
Verify that the injector is OK by