Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision Both sides next revision
techtalk:evo:engctl03 [2020/08/11 22:29]
hippysmack [TMAP - Temperature/Manifold Absolute Pressure] 		techtalk:evo:engctl03 [2020/08/13 03:50]
hippysmack [TMAP - Temperature/Manifold Absolute Pressure]
Line 248: Line 248:
  
 The TMAP sensor provides information to the ECM upon which the ECM alters the timing of the spark and the injection of fuel based on the current vacuum conditions in the manifold. By altering the spark timing and fuel, better combustion occurs in varied situations. The TMAP sensor provides information to the ECM upon which the ECM alters the timing of the spark and the injection of fuel based on the current vacuum conditions in the manifold. By altering the spark timing and fuel, better combustion occurs in varied situations.
 +
 +**The MAP Sensor** \\
 +
 +The MAP on 1998-2003 Sport models only is a stand alone unit mounted under the frame below the fuel tank. The MAP on 2004-2006 Models is also a stand alone unit mounted to the intake manifold. Function and testing is the same as in 2007 models below.
  
 **The MAP Sensor in the TMAP Sensor** **The MAP Sensor in the TMAP Sensor**
  
-  * The MAP monitors the changing vacuum (pressure) in the manifold that occurs as you ride, change speeds and vary the engine load via the throttle position. It is temperature compensated and uses a complex algorithm to help offset the pulsating wobble effect of the HD V twin's assymetrical firing setup.+  * The MAP on monitors the changing vacuum (pressure) in the manifold that occurs as you ride, change speeds and vary the engine load via the throttle position. It is temperature compensated and uses a complex algorithm to help offset the pulsating wobble effect of the HD V twin's assymetrical firing setup.
  
   * It is a very major component of the final speed density calculation that ulimately determines the injector'​s pulse width required to sustain the best A/F ratio at any given time.   * It is a very major component of the final speed density calculation that ulimately determines the injector'​s pulse width required to sustain the best A/F ratio at any given time.
Line 258: Line 262:
  
 ^ DTCode ^ Trouble Indicated | ^ DTCode ^ Trouble Indicated |
 +|1998-2003 S-Models ((1998 HD Sportster FSM pg 7-33))||
 +| Code 12 | MAP Out Of Range or Fluctuates Faster Than Normal |
 +|2004-Up Models||
 +| P0106 | MAP Sensor Rate-Of-Change Error|
 | P0107 | Map Sensor Open/Low |  | P0107 | Map Sensor Open/Low | 
 | P0108 | Map Sensor High |  | P0108 | Map Sensor High | 
  
 +  * The P0106 will set if the MAP sensor signal fluctuates faster than normal operation. ((2005 Electrical Diagnostics Manual pg 4-35))
   * The P0107 indicates that the reading was either absent or fell below the minimum range for some period of time. If not calibrated correctly or working properly the ECM will assign a canned value and use the other inputs to adjust the A/F ratio. It will greatly affect your richness/​leaness if it is skewed or not registering accurate readings.   * The P0107 indicates that the reading was either absent or fell below the minimum range for some period of time. If not calibrated correctly or working properly the ECM will assign a canned value and use the other inputs to adjust the A/F ratio. It will greatly affect your richness/​leaness if it is skewed or not registering accurate readings.
  
-**TESTING the MAP SENSOR ​OPERATION** ((http://​xlforum.net/​forums/​showthread.php?​t=278587))+**TESTING the MAP SENSOR ​OUTPUT SSIGNAL**  ((2005 HD Sportster Electrical Diagnostics Manual pg 4-35)) \\ 
 +The signal varies in accordance with engine vacuum and atmospheric barometric pressure. Changes in barometric pressure are influenced by weather and altitude. \\
  
-  * This requires a digital multi-meter set to the 0 - 20 volt dc setting. +  * This requires a digital multi-meter set to the 0 - 20 volt dc setting ​(and optional Mityvac or other hand held vacuum pump). \\ See also [[techtalk:​ref:​tools160#​mityvac_vacuum_pump_function_and_usage|MityVac Vacuum Pump Function and Usage]] in the Sportsterpedia. \\ 
-  * Typically most MAP sensors are simply a set of resistive strain guages mounted on a suitable substrate and forming a bridge circuit.+  * Typically most MAP sensors are simply a set of resistive strain guages mounted on a suitable substrate and forming a bridge circuit. ​((Fe Head of the XLFORUM http://​xlforum.net/​forums/​showthread.php?​t=278587&​page=3))
   * With the ignition switch turned to ON, test the leads as follows:   * With the ignition switch turned to ON, test the leads as follows:
-  - (Input Power) Probe the R/W wire ((Hippysmack)) ​lead and verify it has +5 volts. +  - (Input Power) Probe the R/W wire lead and verify it has +5 volts. 
-  - (Signal Out) Remove the hose from intake manifold and if needed add an extension to it so you can easily apply a vacuum with with a vacuum ​gauge or your mouth. +  - (Signal Out) Remove the hose from intake manifold and if needed add an extension to it so you can easily apply a vacuum with the vacuum ​pump or your mouth. 
-  - Draw as much vacuum ​as you can and seal it (with your tongue) ​while probing the V/W wire ((Hippysmack)) to read between 1.5-3.0 volts.((original value was 3.5 to 4.5 volts in thread footnoted - but 2005 EDM says higher vacuum = lower voltage)) ​\\ You can also use a MityVac to create vacuum ​instead. See [[techtalk:​ref:​tools160#​mityvac_vacuum_pump_function_and_usage|MityVac Vacuum Pump Function and Usage]] in the Sportsterpedia. +  - Draw up some vacuum while probing the V/W wire. The signal voltage should lower as the vacuum is applied ​(read between 1.5-3.0 volts). \\ **Caution**:​ Do not over-pump (or otherwise ​create ​too much vacuum) during MAP sensor output check as sensor damage may result. 
-  - Then release the vacuum slowly and see the voltage increase((footnoted thread says voltage drops - but 2005 EDM says less vacuum = higher voltage)) as you do, confirming the lead signal functions. +  - Then release the vacuum slowly and see the voltage increase, confirming the output ​signal functions ​properly.
-  * This will confirm the functionality of the MAP sensor.+
   * This signal is the one that the ECM uses to assess the state of load on the engine relative to the Throttle Position Sensor and the tachometer reading.   * This signal is the one that the ECM uses to assess the state of load on the engine relative to the Throttle Position Sensor and the tachometer reading.
  

Trace: