Checking IPR
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Checking IPR
Hello all.
What are the proper steps to checking the IPR? I have low injection pressure. The highest sustained pressure I have seen is 1800 PSI. I am leaning towards the pump as it have 87K miles and large injectors. However I want to make sure its not the IPR so I don't spend worthless money. So let me know what you know. Thanks.
Tim
What are the proper steps to checking the IPR? I have low injection pressure. The highest sustained pressure I have seen is 1800 PSI. I am leaning towards the pump as it have 87K miles and large injectors. However I want to make sure its not the IPR so I don't spend worthless money. So let me know what you know. Thanks.
Tim
Somebody has to have a few good ideas here
Junior User
Joined: May 2007
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http://cw-diesel.com/LuxSite/IPRInfo.htm
best I can do for you, it is really how to fix rather than diognose... but maby it will help.
best I can do for you, it is really how to fix rather than diognose... but maby it will help.
Post Fiend
Joined: Jun 2006
Posts: 5,497
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From: Central, Al
IPR is an PCM output 0-12 volts. A step test is performed during the KOER test.
Output Functions
Injection Pressure Regulator (IPR) — A variable position valve that controls injection control pressure. The powertrain control module (PCM) uses many input variables to determine the desired injection control pressure.
Battery voltage is supplied to the IPR when the ignition key is in the ON position. Valve position is controlled by switching the output signal circuit to ground inside the PCM. ON/OFF time is modulated from 0 to 50% dependent upon the desired injection control pressure.
Detection/Management
An open or shorted to ground control circuit can be detected by an on demand output circuit check performed during the KOEO test. When the starter is engaged and the engine fails to start, the IPR command will increase toward its maximum until the engine starts. The normal range for the IPR at idle is between 8-16%. An above 16% range indicates high effort to achieve idle. A below 8% indicates low effort to achieve idle.
The PCM is capable of detecting whether desired injection control pressure is equal to measured injection control pressure while the engine is running. If the measured injection control pressure does not reasonably compare to the desired injection control pressure the PCM ignores the measured ICP sensor signal and attempts to control the engine with the desired value. (If the problem was in the sensor circuit this strategy causes little performance deterioration. If the problem is in the control circuit, engine performance will probably still be unsatisfactory).
An injection control pressure step test, in which the PCM commands and then measures specific preprogrammed pressures is performed during the KOER test.
Output Functions
Injection Pressure Regulator (IPR) — A variable position valve that controls injection control pressure. The powertrain control module (PCM) uses many input variables to determine the desired injection control pressure.
Battery voltage is supplied to the IPR when the ignition key is in the ON position. Valve position is controlled by switching the output signal circuit to ground inside the PCM. ON/OFF time is modulated from 0 to 50% dependent upon the desired injection control pressure.
Detection/Management
An open or shorted to ground control circuit can be detected by an on demand output circuit check performed during the KOEO test. When the starter is engaged and the engine fails to start, the IPR command will increase toward its maximum until the engine starts. The normal range for the IPR at idle is between 8-16%. An above 16% range indicates high effort to achieve idle. A below 8% indicates low effort to achieve idle.
The PCM is capable of detecting whether desired injection control pressure is equal to measured injection control pressure while the engine is running. If the measured injection control pressure does not reasonably compare to the desired injection control pressure the PCM ignores the measured ICP sensor signal and attempts to control the engine with the desired value. (If the problem was in the sensor circuit this strategy causes little performance deterioration. If the problem is in the control circuit, engine performance will probably still be unsatisfactory).
An injection control pressure step test, in which the PCM commands and then measures specific preprogrammed pressures is performed during the KOER test.
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