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1998 – 2000 Nissan FRONTIER & XTERRA MIL WITH DTC P0400, P0402, ROUGH IDLE, DRIVABILITY INCIDENTS, DIFFICULTY SETTING EGR SRT

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Filed Under (Nissan) by admin on 31-12-2010

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IF YOU CONFIRM: • DTC P0400 (EGR) or P0402 (EGRC-BPT Valve) is stored in the ECM, and/or • The vehicle exhibits rough running or other drivability incidents, and/or • Difficulty in setting the EGR System Readiness Test (SRT) status to CMPLT. ACTION: Clean the intake manifold EGR ports.SERVICE PROCEDURE 1. Remove the throttle chamber assembly and place it aside. • Refer to the EM section of the appropriate Service Manual (ESM). NOTE: It is not necessary to completely remove the throttle chamber assembly. • Only remove harness connectors, cables, and hoses necessary to allow the throttle chamber assembly to be placed aside. • Throttle chamber coolant hoses do not need to be removed. NOTE: Figure 1 gives a general location of the plugs for the EGR ports, but the plugs are not visible in the photo. 2/4 2. Remove the EGR valve mounting bolts and then move the EGR valve outward about ½ inch (see Figure 2). • This is so you can remove the plug for the “rear most” EGR port. NOTE: You don’t need to completely remove the EGR valve. Rear Most EGR Port. EGR Valve EGR Mounting Bolts Move about ½ inch. Figure 2 3. Remove the plugs for the EGR ports (see Figure 3). Figure 3

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2002 BMW 525I 2003 BMW X5 2001 BMW Z3 Roadster Check engine light is on.

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Filed Under (BMW) by admin on 11-06-2010

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1. Use a scan tool to monitor the fuel trim numbers and the Mass Air Flow (MAF) sensor data stream grams/sec readings. Nominal
values are 5 grams/sec at idle in Park, and >150 at Wide Open Throttle (WOT) and 5000 RPM, in gear. Some scan tools have a freeze frame feature, which is useful in trouble shooting if the problem is set at idle versus at cruise. Vacuum leaks and crankcase breather problems generally show up at idle. Voltage at the airflow meter should be .7-.9V at idle and increase from there with more airflow. 2. Monitor the crankcase vacuum with a vacuum gauge, which can be adapted onto the tube for the oil dipstick. Specification for the crank case vacuum is 8 to 15 millibar, this equals about 1/4 to 1/2 PSI or pounds per square. So, 1 PSI of vacuum would be twice as much as there should be at idle. The proper method, per BMW, is to use a slack tube manometer which can be made easily with clear tubing and making it into a U shape and have it marked in inch increments then half fill it with water. When crankcase vacuum is applied to one side of the tubing it should displace 4 to 6 inches of water if the crankcase breather is working correctly. 3. Monitor the fuel pressure. It should be a constant 50 – 53 PSI.

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2004-2005 Nissan Maxima MIL “ON” WITH DTC P1402 (EGR OPEN) CODE STORED

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Filed Under (Nissan) by admin on 31-12-2010

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IF YOU CONFIRM The MIL is ON and code P1402 EGR OPEN is stored in the ECM. ACTION • Inspect the EGR valve for metallic debris. See the Service Information section of this bulletin for the specific inspection procedure. • If metallic debris is present, replace the Bank 1 catalyst and EGR valve. SERVICE INFORMATION 1. Remove the EGR valve as per the EM section of the respective ESM. 2. Inspect the EGR valve for metallic flake debris. (see Figures 1 and 2) 3. If metallic debris is present in the EGR valve, remove Bank 1 catalyst (rear of engine) as per EM section of the respective ESM. 4. Inspect both the top and bottom of the catalyst. • Bank 1 Catalyst–viewed from the top. (see Figure 3) 5. If the catalyst has loose material as seen if Figure 3 above, blow out the debris from interior of Bank 1 exhaust manifold. Remove the EGR valve and tube, and then blow out any debris from the EGR valve and tube. 6. Replace the Bank 1 catalyst and EGR valve in the reverse order of removal. 7. Clear stored code P1402 from the ECM memory.

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2001 Acura MDX DTC P1491: EGR Valve Insufficient Lift

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Filed Under (Acura) by admin on 17-10-2010

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Reset the PCM . 2. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on. 3. Drive the vehicle under load for about 10 minutes . Try to keep the engine speed in the 1,700 – 2,500 rpm range. 4. Check the Temporary DTC with the scan tool. Is Temporary DTC P1491 indicated? YES – Go to step 5. NO – Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the EGR valve and at the PCM. 5. Turn the ignition switch OFF . 6. Disconnect the EGR valve 6P connector. 7. Start the engine and let it idle. 8. Measure voltage between EGR valve 6P connector terminals No. 4 and No. 6. Is there about 9 – 10 V ? YES – Go to step 9. NO – Substitute a known-good PCM, and recheck. If the symptom/indication goes away, replace the original PCM. 9. Turn the ignition switch OFF . 10. Turn the ignition switch ON (II). 11. Measure voltage between EGR valve 8P connector terminals No. 2 and No. 3. Is there about 5 V ? YES – Go to step 13. NO – Go to step 12. 12. Measure voltage between PCM connector terminals C18 and C28. Is there about 5 V? YES – Repair open in the wire between the EGR valve and the PCM (C18, C28). NO – Substitute a known-good PCM and recheck. If the symptom/indication goes away, replace the original PCM. 13. Turn the ignition switch OFF .

BMW 5-Series (E39) Repair Manual 525i, 528i, 530i, 540i, Sedan, Sport Wagon 1997-2002

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Filed Under (BMW) by admin on 07-09-2009

Comprehensive, single source of service information and specifications available specifically for BMW 5 Series from 1997 to 2002. The aim throughout this manual has been simplicity, clarity and completeness, with practical explanations, step-by-step procedures and accurate specifications. Whether you are a professional or a do-it-yourself BMW owner, this manual will help you understand, care for and repair your E39 5 Series. Though the do-it-yourself BMW owner will find this manual indispensable as a source of detailed maintenance and repair information, the BMW owner who has no intention of working on his or her car will find that reading and owning this manual will make it possible to discuss repairs more intelligently with a professional technician.
Engines covered in this BMW repair manual:
* 6-cylinder engines: M52, M52 TU, M54
* V-8 engines: M62, M62 TU
Fuel injection systems covered in this BMW repair manual:
* Bosch M 5.2, M 5.2.1, ME 7.2
* Siemens MS 41.0, MS 42.0, MS 43.0
Manual transmissions covered in this BMW repair manual:
* Getrag S5D 250G, S6S 420G
* ZF S5D 320Z
Automatic transmissions covered in this BMW repair manual:
* A4S 270R, A4S 310R
* A5S 360R, A5S 390R
* A5S 325Z
*A5S 560Z, A5S 440Z

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