Recommended Procedure
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NOTE:
Camshaft Position (CMP) signal is required before IPR is commanded above 14 percent.
Using scan tool, access ICP and IPR PIDs from PID/DATA MONITOR & RECORD menu. Crank engine while monitoring ICP and IPR PID readings. If IPR PID reading goes above 14 percent, ICP PID pressure reading should be 500 psi (3450 kPa) or more provided that oil reservoir is full, IPR valve is not stuck open, high pressure pump is building pressure and there is not an injection control pressure leak between high pressure pump and all injectors. If ICP PID reading is 500 psi (3450 kPa) or more, go to TEST 9D: CHECK FUEL PULSE WIDTH WHILE CRANKING . If ICP PID reading is less than 500 psi (3450 kPa), injectors will not be enabled by PCM because of insufficient rail pressure. Perform INJECTION CONTROL PRESSURE LEAK TEST .