Econoline E550 V8-7.3L DSL Turbo VIN F (2002)
The PCM attempts to increase ICP by raising the IPR%.
Note: As a general rule 7.3 Power stroke engines require 500 psi ICP (1.0 volts ICPv) minimum to start.
1.) ICP System Diagnostics
P1211 sets if ICP is 410 psi above or 280 psi below desired pressure for 7.5 seconds.
P1212 sets if 725 psi of ICP is not detected in 6 to 15 seconds of cranking.
P1280 code is for ICP circuit low (often open circuits). Typical issues include, corrosion, spread pins, or improperly crimped terminals at the ICP sensor
harness connector.
If a P1280 is set, the PCM will display a default value of 725 psi at idle. To verify open circuit concern use ICPv.
ICP KOEO signal voltage should be between .16 to .28 volts.
2.) No Start Diagnostics
IPR% goes high with no or low ICP. A leak exists in the system - P1211 or 1212 may be present.
Use test plugs tool # D94T 6600 A for 94 thru 98 MY.
Use test plugs tool # 303-627 & 303-628 (kit # T99T-1000-E) for 99 my and newer with quick connect.
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Block off right bank (passenger side).
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Attempt to start.
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Start indicates leak in right bank.
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Reconnect hose to right bank.
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Remove right side valve cover.
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Unplug injector connectors at both valve covers.
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Crank the engine.
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Observe spill out of the injector and top of injector bore for oil leakage. (no oil should be coming out from the spill spouts or around the injector.)
-Replace injector if oil leaks from spill spout or O-ring if leak is from injector bore.
If no start - leak/loss may not be right head, but ICP still low.
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Block off left bank and move ICP into adapter.
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Attempt to start.
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Start indicates leak in left bank.
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Reconnect hose to left bank and install ICP into left head.
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Remove left side valve cover.
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Unplug injector connectors at both valve covers.
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Crank engine.
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Observe spill spout of the injector and top of injector bore for oil leakage. (No oil should be coming out from the spill spout or around the
injector.)
-Replace injector if oil leaks from spill spout or O-ring if leak is from injector bore.
If not start / low ICP on both previous tests
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Block off both high pressure lines.
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Crank engine.
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If pressure is below 1000 psi remove IPR valve and inspect O-rings.
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If the IPR valve O-ring are damaged replace them with kit # F6TZ-9C977-AA and retest.
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If O-ring are ok, then replace the IPR valve and retest.