Cylinder Balance Test
The cylinder balance test is an aid in servicing the 5.0L SEFI fuel system by energizing and de-energizing each injector separately. This test mode is entered after all codes have been displayed. Immediately following the KEY ON/ENGINE RUNNING (KOER) SELF-TEST , lightly depress throttle (a 2-3 degree throttle angle is required, NOT a wide open throttle). Service codes displayed during this test correspond to cylinder number.
CYLINDER BALANCE TEST SERVICE CODES
| Service Code | Cylinder/Injector No. | Breakout Box Test Pin No. |
|---|---|---|
| 90 | Pass | Pass |
| 10 | 1 | 58 |
| 20 | 2 | 59 |
| 30 | 3 | 12 |
| 40 | 4 | 13 |
| 50 | 5 | 14 |
| 60 | 6 | 15 |
| 70 | 7 | 42 |
| 80 | 8 | 52 |
| 77 | Retest | Retest |
If code 90 is displayed during this test it indicates a pass. If code 77 is displayed, repeat cylinder balance test. If throttle is moved during this test, service code 77 will appear, indicating that test was not completed. Total test time is about 90 seconds.