Cylinder 2 Multiple Misfire

2568-CYLINDER 2 MULTIPLE MISFIRE

For a complete wiring diagram Refer to the Wiring Information Electrical Diagrams

- When Monitored:
With the engine running.

- Set Condition:
The ECM detects multiple misfires from cylinder #2.





1. CHECK FOR ACTIVE DTC

NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.

NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

1. With the scan tool, erase ECM DTCs.
2. Test drive the vehicle and attempt to duplicate the problem.
3. With the scan tool, read ECM DTC's.

Did this DTC set again?

Yes

- Go To 2

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.

2. FUEL CONTAMINATION
1. Refer to the Service Information and inspect the fuel supply for contamination.

Is the fuel contaminated?

Yes

- Refer to the Service Information to remove and replace fuel throughout the fuel system.
- Perform the ECM Verification TestVerification Tests.

No

- Go To 3

3. ENGINE COMPRESSION
1. Turn the ignition off.
2. With the scan tool, perform the Cylinder Compression Test.

Is the cylinder compression within specification for all cylinders?

Yes

- Go To 4

No

- Repair as necessary.
- Perform the ECM Verification TestVerification Tests.

4. CYLINDER FUEL QUANTITY CORRECTION
1. Turn the ignition off.
2. With the scan tool, perform the Cylinder Fuel Quantity Correction Test.

Is each Cylinder within specifications?

Yes

- Go To 5

No

- Repair or replace as necessary.
- Perform the ECM Verification TestVerification Tests.

5. FUEL INJECTOR LEAKAGE
1. Turn the ignition off.
2. Perform the INJECTOR LEAKAGE TEST.

Were any problems found?

Yes

- Repair or replace as necessary.
- Perform the ECM Verification TestVerification Tests.

No

- Test Complete.