Diagnostic Procedure C

DIAGNOSTIC PROCEDURE C: Poor Engine Performance And/Or Loss Of Engine Power While Driving

1. Using the DRBIII(R), and perform a "Module Scan". Check for DTC's and record DTC's on the repair order. Record the Boost Air Temperature, Boost Pressure, Intake Pressure, and Atmospheric Pressure on the repair order: Check to insure the brake light switch is adjusted and functioning properly.

2. Are any DTC's present in? If DTC's are present, proceed to Step # 3. If DTC's are not present, proceed to Step # 4.

3. In case of a DTC with the status "CURRENT and/or STORED", follow the service information for that DTC and repair accordingly. When the repair is completed, proceed to Step # 17.

4. Using the DRBIII(R), perform compression test. If the compression test is OK, proceed to Step # 5. If compression test is not OK, repair as necessary and proceed to Step # 17.

5. Using the DRBIII(R), perform the "Fuel Rail Pressure Sensor Test". If the voltage between .47 and .53 volts, proceed to Step # 8. If not OK, proceed to Step # 6.

6. Check the Engine Control Module (ECM) connector and wiring harness for corrosion, pushed out wire, or connection problems. If a problem was detected, repair as necessary and proceed to Step # 17. If no problem was detected, proceed to Step # 7.

7. Replace the fuel rail pressure sensor. Refer to the service information available in TechCONNECT. Proceed to Step # 17.

8. **Using the DRBIII(R), perform the "Injector Correction Quantity" test. The values should be within +/- 0.00450 cc/stroke of each other. Replace any injectors with an injection correction quantity equal to or higher than 0.00450 cc/stroke. Refer to information available in TechCONNECT and then proceed to Step # 9. If the correction quantities are within specifications, proceed to Step #10.**

9. Replace the injector with excessive leakage. Refer to the service information available in TechCONNECT. When repair is complete, return to Step # 17 and repeat the test.

10. Using the DRBIII(R), perform the "Fuel Quantity Control Solenoid Test 1" and "Fuel Quantity Control Solenoid Test 2". If the values are OK, proceed to Step #12. If the values are not OK, proceed to Step # 11.

11. Depending on the results from Step # 10, replace the Fuel Quantity Solenoid from the Fuel Injection Pump or the complete fuel rail. Refer to the service information available in TechCONNECT. When repair is complete, proceed to Step # 17.

12. Perform the "Fuel Leak Quantity" test. Refer to the information available in TechCONNECT. Refer to 14 - Fuel System - Diagnosis And Testing. Each value must not exceed 5 graduation lines of the large vial (40 ml). If the values do not exceed 5 graduation lines of the large vial (40 ml), proceed to Step # 14. If the values exceed 5 graduation lines of the large vial (40 ml), proceed to Step # 13.

13. Replace the injector with excessive leakage. Refer to the service information available on TechCONNECT. When the repair is complete, return to Step # 12 and repeat the test.

14. Using the DRBIII(R), perform the "Pump Pressure Generation" test. The pressure should increase from approximately 39990 kPa (5800 PSI) to approximately 139998 kPa (20305 PSI) within 2 seconds. If the pressure increases within 2 seconds, proceed to Step # 16. If the pressure does not increase to 139998 kPa (20305 PSI) within 2 seconds, proceed to Step # 15.

15. Replace the Fuel Injection Pump. Refer to the service information available in TechCONNECT. Proceed to Step # 17.

16. Using the DRBIII(R) actuate the EGR Valve and the Boost Pressure Solenoid. Compare the actual and the specified "Boost Pressure" value. Repair as necessary. When repairs are complete, proceed to Step # 17.

17. Perform the "Road Test Verification" - VER-2. Refer to the service information available in TechCONNECT.