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techtalk:evo:engctl03 [2022/01/27 22:33] ixl2relax [CPS - Cam Position Sensor] |
techtalk:evo:engctl03 [2022/05/29 02:06] ixl2relax [VSS - Vehicle Speed Sensor] |
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| The ECM has protection against transient voltages, continuous reverse voltage protection, and damage due to jump starts. It is fully enclosed to protect it from vibration, dust, water or oil. | The ECM has protection against transient voltages, continuous reverse voltage protection, and damage due to jump starts. It is fully enclosed to protect it from vibration, dust, water or oil. | ||
| - | The CKP sensor generates an AC signal which is sent to the ECM where it is used to reference engine position (TDC) and speed. It functions by taking readings off the 32-2 teeth on the left side flywheel (two teeth are missing to establish a reference point). | + | The CKP sensor generates an AC signal which is sent to the ECM where it is used to reference engine position (TDC) and speed. It functions by taking readings off the 32minu2 teeth on the left side flywheel (two teeth are missing to establish a reference point). |
| The TMAP sensor is located on top of the intake manifold. The TMAP sensor monitors the intake manifold pressure (vacuum) and intake air temperature and sends the information to the ECM where the module adjusts the spark timing and fuel curve for optimum performance. | The TMAP sensor is located on top of the intake manifold. The TMAP sensor monitors the intake manifold pressure (vacuum) and intake air temperature and sends the information to the ECM where the module adjusts the spark timing and fuel curve for optimum performance. | ||
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| Check [[http://xlforum.net/forums/showthread.php?t=800778|this XLForum thread]] for a 'FIX' to erratic speedo operation for 1995-2003 models. | Check [[http://xlforum.net/forums/showthread.php?t=800778|this XLForum thread]] for a 'FIX' to erratic speedo operation for 1995-2003 models. | ||
| - | **(2004-2013)** (2004-2012 = P/N 74402-04A - 2013 = P/N 74402-05B)\\ | + | **(2004-2013)** (2004 only = P/N 74402-04A - 2005-2013 = P/N 74402-05B)\\ |
| The VSS is a 5v-based hall-effect sensor. The 5v power source for the sensor (BLACK/RED wire of the twisted pair) comes from the ICM/ECM and the pulsing output from the sensor (BLACK/BLUE wire of the twisted pair) goes to the ICM/ECM for processing. The ground connection (BLACK wire) is part of the main harness. | The VSS is a 5v-based hall-effect sensor. The 5v power source for the sensor (BLACK/RED wire of the twisted pair) comes from the ICM/ECM and the pulsing output from the sensor (BLACK/BLUE wire of the twisted pair) goes to the ICM/ECM for processing. The ground connection (BLACK wire) is part of the main harness. | ||
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| If you are able to observe the above voltage variations from the sensor, but the speedometer is still erratic or otherwise malfunctioning, be sure to test all the wiring between the sensor and the ICM/ECM as well as the Serial Data Bus connection. As a last resort, replacement of the VSS or the speedometer may be in order. | If you are able to observe the above voltage variations from the sensor, but the speedometer is still erratic or otherwise malfunctioning, be sure to test all the wiring between the sensor and the ICM/ECM as well as the Serial Data Bus connection. As a last resort, replacement of the VSS or the speedometer may be in order. | ||
| + | (The 74402-04A sensor has a long attached cable while the later 74402-05B has a connector built on the sensor with the wiring being part of the main harness.) | ||
| **(2014-on)** (P/N 74402-05B)\\ | **(2014-on)** (P/N 74402-05B)\\ | ||
| - | The VSS sensor is the same 5v-based hall-effect sensor as 2013. The ECM (Engine Control Module) handles all the processing of the signals and sends data to the speedometer over the new CANbus communications connection. | + | The VSS sensor is the same 5v-based hall-effect sensor as for 2013 models and the ECM (Engine Control Module) handles all the processing of the signals. The speedometer now utilizes the new CANbus to send the calculated data to the speedometer. |
| Note this very informative [[http://xlforum.net/forums/showthread.php?t=1883180|__XLForum Thread__]] regarding the VSS. | Note this very informative [[http://xlforum.net/forums/showthread.php?t=1883180|__XLForum Thread__]] regarding the VSS. | ||
