Navistar MaxxForce DT Diagnostic Manual page 129

Actions:
1. Verify FRP signal value reaches 31,900 psi (219,943 kPa) at full load.
2. Verify FRP signal value is within a 1000 psi (6,895 kPa) range of FRPD signal value during
acceleration.
NOTE – Analyze Lug Down Test signal values only during engine acceleration, and not deceleration or
shifting.
https://www.truck-manuals.net/
DIAGNOSTIC MANUAL
125