HPCA & HPAA Systems
The HPCA and HPAA are designed to work in conjunction to control injection timing by altering injection housing pressure. Refer to Injection Housing Pump Timing Control chart to determine if system is functioning correctly.
INJECTION HOUSING PUMP TIMING CONTROL
| Condition | HPCA | HPAA | Housing Pressure: psi (kg/cm2 ) | ||
|---|---|---|---|---|---|
| Low Alt. Package | |||||
| Below 4000 Ft. | |||||
| Engine Cold | ON | OFF | 0 | ||
| Engine Hot | OFF | OFF | 10 (.7) | ||
| Above 4000 Ft. | |||||
| Engine Cold | ON | OFF | 0 | ||
| Engine Hot | ON | ON | 7 (.5) | ||
| High Alt. Package | |||||
| Below 4000 Ft. | |||||
| Engine Cold | ON | OFF | 0 | ||
| Engine Hot | OFF | ON | 13 (.9) | ||
| Above 4000 Ft. | |||||
| Engine Cold | ON | OFF | 0 | ||
| Engine Hot | OFF | OFF | 10 (.7) | ||