1996 MERCEDES C220 IDLE RELEARN
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Filed Under (Nissan) by admin on 21-12-2010
Customer Concern: Tests/Procedures: Potential Causes: Tech Tips: Just did a tune up and cleaned the throttle body and now the idle is hunting up and down. 1. Perform the Accelerator Pedal Released Position Learning procedure. 2. Perform the Throttle Valve Closed Position Learning procedure. 3. Perform the Idle Air Volume Learning procedure described in the Identifix article listed for this vehicle. It may be necessary to follow TSB# NTB05-067 and disconnect one or more fuel injectors as necessary to bring the RPM down and then perform the Idle Air Volume Learning procedure. 4. If the idle will not relearn, it may be necessary to bring the vehicle to the dealer to have the factory scan tool, try going through the relearn procedures. 5. If the problem still occurs, the vehicle may require throttle body replacement. Idle Relearn Procedure Engine speed at 200 RPM or more over the target idle speed will set this code. There is a TSB (TSB# NTB05-067) concerning this code that refers to disconnecting one or more fuel injectors to bring the RPM down and perform the Idle Air Volume Learning procedure. It often takes disconnecting two injectors to bring the engine RPM low enough for the idle relearn to work. The idle will not relearn if the engine speed is too high. During the relearn procedure, idle relearning actually begins when the engine is started. The TSB refers to using the factory Consult scan tool, but the manual procedure does work if the procedure is followed EXACTLY. The engine and automatic transmission (if equipped) needs to be warmed up too – follow the preparation instructions.
Filed Under (Mercedes-Benz) by admin on 13-09-2009
Manual contains in-depth maintenance, service and repair information for the Mercedes-Benz C-Class from 1994 to 2000. The aim throughout has been simplicity and clarity, with practical explanations, step-by-step procedures and accurate specifications. Whether you’re a professional or a do-it-yourself Mercedes-Benz owner, this manualhelps you understand, care for and repair your car Electrical system service, with an easy-to-use illustrated component
locator section. • Comprehensive wiring schematics, including power distribution and grounds. • Mercedes-Benz OBD II diagnostic trouble codes, SAE-defined OBD II P-codes, as well as basic scan tool operation.
• Mercedes-Benz factory tolerance, wear limits, adjustments and tightening torque
Filed Under (Mercedes-Benz) by admin on 11-06-2010
2000 Mercedes-Benz ML320 3.2L 2001 Mercedes-Benz E320 3.2L 2001 Mercedes-Benz C240 2.6L 2001 Mercedes-Benz E320 4Matic 3.2L 2001 Mercedes-Benz C320 3.2L 2002 Mercedes-Benz ML320 3.2L Potential Causes: Pedal Sensor Throttle Body Wiring Tech Tips: With new sensor the throttle stops must be relearned. Use compatible scan tool and perform adaptations. ALWAYS verify charging system voltage is correct. Tests/Procedures: 1. Connect scan tool and monitor voltages of pedal sensor B37. Signal 1 (Accelerator pedal position: Idle speed):[0.2...0.5] V Signal 2 (Accelerator pedal position: Idle speed):[0.1...0.5] V Signal 1 (Accelerator pedal position:Kickdown):[4.3...4.8] V Signal 2 (Accelerator pedal position:Kickdown):[2.1...2.5] V 3. Test throttle body voltages with scan tool. Potentiometer #2 signal voltage ignition on, accelerator pedal position CTP 0.3-0.9 VDC, WOT > CTP value Potentiometer #1 signal voltage Ignition on, accelerator pedal position CTP 4.0-4.6 VDC, WOT < CTP value.
Filed Under (Honda) by admin on 21-12-2010
NOTE: If DTC P1519 is stored at same time as DTC P0505, troubleshoot DTC P1519 first, then recheck for DTC P0505. 1. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on. 2. Check the engine speed at idle with no-load conditions: headlights, blower fan, rear window defogger, radiator fan, and air conditioner off. Is the engine running at 730+/-50 rpm? YES – Intermittent failure, system is OK at this time.? NO – If the idle speed is less than 680 rpm, go to step 3; if it’s 780 rpm or higher, go to step 4. 3. Disconnect the idle air control (IAC) valve 3P connector. Does the engine speed increase or fluctuate? YES – Adjust the idle speed. If the idle will not adjust properly, clean the passage in the throttle body, and then adjust the idle.? NO – Replace the IAC valve.? 4. Turn the ignition switch OFF. 5. Remove the intake air duct from the throttle body. 6. Start the engine and let it idle. 7. Put your finger on the lower port (A) in the throttle body. Does the engine speed drop below 780 rpm? YES – Adjust the idle speed. If the idle will not adjust properly, replace the IAC valve, and then adjust the idle.? NO – With the throttle valve completely closed, check for vacuum leaks, and repair as necessary.?
Filed Under (Dodge) by admin on 31-10-2010
The high-speed idle screw is factory sealed and cannot be adjusted. Low-speed idle can be adjusted. 1. Use an optical tachometer such as Snap-on No. MT139 or MTE (Cummins tool division) No. 3377462 to read the engine RPM. 2. Bring the engine to normal operating temperature. 3. Adjust the low idle speed at the low idle speed screw. The screw and locknut are located at the rear of the fuel injection pump. 4. Loosen the idle screw lock nut. Adjust idle screw to obtain specified RPM. LOW IDLE SPEED With automatic transmission: 750-800 RPM with transmission in drive and air conditioning on. With manual transmission: * 780 RPM with transmission in neutral and air conditioning on. * With engine at operating temperature. HIGH IDLE SPEED Do not attempt to adjust high idle speed. High idle speed adjustment screw is factory sealed. Breaking seal will void injection pump warranty 5. Tighten the locknut after adjustment.