Injection Pressure Regulator (IPR) and High Pressure Pump Test

If injection control pressure is still low after ruling out both cylinder heads as the source of injection control pressure leakage, perform the following steps to isolate the cause. Leave the Injection Control Pressure (ICP) sensor and ICP adapter connected to the left high pressure hose. Remove the high pressure hose from the right cylinder head and cover the fitting on the cylinder head with the appropriate cap from the Fuel/Oil/Turbo Protector Cap Set T94T-9395-AH. Install the plug from the Oil High Pressure Leakage Test Adapter Set D94T-6600-A into the high pressure hose to block it off. With the high pressure pump effectively deadheaded, crank the engine and monitor the signal. If injection control pressure is not within specification, replace the Injection Pressure Regulator (IPR) with a known good IPR and retest. If a low pressure condition still exists, the problem is most likely with the high pressure pump or the high pressure pump drive gear.

TOOLS REQUIRED
- Fuel/Oil/Turbo Protector Cap Set T94T-9395-AH
- ICP/EBP Adapter Cable D94T-50-A
- Oil High Pressure Leakage Test Adapter Set D94T-6600-A
- Rotunda Digital Volt-Ohm Multimeter (DVOM) 105-00050 or equivalent
- 1/4-inch drive ratchet or breaker bar to remove inspection plug