background image

© MAHLE 

6  |  OBD-II Smartbox  |  Product Use

en

3.1.2  Test with ignition key in ON position

If the first test did not indicate any problem, then proceed with 
the second test. With the OBD-II Smartbox still attached to the 
vehicle DLC, switch the ignition key to ON position then press 
Retest button on the OBD-II Smartbox once.

The test starts immediately with the testing of all the 14 pins other 
than pin 4 chassis ground and pin 16 positive Voltage supply. At 
the same time it will detect the type of communication protocol 
(PWM,  VPW,  ISO  9141-2,  ISO  14230-4,  CAN  H,  and  CAN  L) 
that the ECU is using and the blue LEDs will blink indicating the 
protocol currently being used.

If any voltage present on vehicle Manufacturer designated pins No.1, 
3, 8, 11, 12 & 13 (yellow color socket) other than OBD2 assigned 
protocol pins 2, 6, 7, 10, 14, 15 (blue color socket) and 5 (Signal 
ground), the corresponding LED will light in the following manners:

 

y

If there is 12V present– the LED will blink slowly at interval of 1 sec 
between each blink. (The ‘Caution – Check LED will illuminate).

 

y

If there is 24V present – the LED will blink fast. (The ‘Caution 
– Check LED will illuminate).

In  situation  where  there  is  12V  or  24V  present  at  the  pin,  the 
voltage was either supplied direct short or through a resistor. Its 
resistance value is normally not more than 20Ώ.

However, when a voltage 0V is supplied from the other end of the 
Scan tool to this pin, a current bigger than 0.6A will flow. This indi-
cation serves as a warning when using Scan tool without current 
limiter built-in because this voltage may damage it when plugged in.

In many cases, Vehicle Manufacturers do provide some pins on 
the OBD-II Diagnostic Link Connector (DLC) at the vehicle for 
RPM signals or Sensors signals used for testing or adjustment. 
These signals are usually found on any of the Manufacturer des-
ignated pins No.1, 3, 8, 11, 12 &13 on the DLC. Therefore such 
signals will be detected and indicated as “Caution – Check”.

In other words, you can still plug in and use your scan tool but 
with risk in case where the Scan tool has no protection.

It is also important to note that the presence of voltage in one of 
the pins maybe one of the reasons why sometimes communica-
tion failed between Scan tool and ECU because of the presence 
of the 12V or 24V shorting.

However, almost all Scan tools nowadays come with protective 
current  circuit  and  this  indication  should  not  be  accepted  as 
danger but served as a warning.

Summary of Contents for TechPRO OBD-II Smartbox

Page 1: ...MAHLE TechPRO OBD II Smartbox EN Operation Manual OBD II Diagnostics ...

Page 2: ...se 4 3 1 Test OBD II port before plug in scantool 4 3 1 1 Test without ignition key 4 3 1 2 Test with ignition key in ON position 6 3 1 3 Test with engine running 7 3 2 Monitor voltage during reflash programming 7 3 3 Detect communication protocol 8 3 4 As break out box 9 3 5 Check alternator condition 9 3 6 As power backup for ECU while replacing car battery 10 3 7 As DC power source for other de...

Page 3: ...er s manual and in particular the safety instructions are studied carefully By doing so you can eliminate any uncertainties in handling MAHLE products and thus associated safety risks upfront something which is in the interests of your own safety and will ultimately help avoid damage to the device When a MAHLE product is handed over to another person all documentation and and information on its de...

Page 4: ... polarity Battery use on OBD Lamp 3V Lithium Battery Model CR1220 3 Product Use 3 1 Test OBD II port before plug in scantool The OBD II Smartbox performs tests on all 16 pins of the OBD II port for abnormalities caused by shorting reverse polarity etc in order to avoid damage to your scan tool prior to plugging in N N Test is carried out with ignition key in the OFF ON and ENGINE RUNNING condition...

Page 5: ...inate c If there is 24V present below 23 8V or above 29 2V in any Manufacturer Designated Pins the LED will blink fast The Caution Check LED will illuminate OBD II assigned protocol pins blue color socket a If there is 12V present below 11 8V or above 15 2V the respective LED will blink slowly at interval of 1 sec be tween each blink with a short beep alarm for 5 sec The Caution Check LED will ill...

Page 6: ... illuminate In situation where there is 12V or 24V present at the pin the voltage was either supplied direct short or through a resistor Its resistance value is normally not more than 20Ώ However when a voltage 0V is supplied from the other end of the Scan tool to this pin a current bigger than 0 6A will flow This indi cation serves as a warning when using Scan tool without current limiter built i...

Page 7: ...blink at a very fast pace The Caution Check LED will illuminate In this case do not plug and test with the Scan tool while engine running as this high voltage input may damage it Check the charging volts to determine whether the regulator is functioning properly Under normal conditions when after all the testing of the vehicle DLC port has been done where there are no abnormal activities the green...

Page 8: ... or multiple blue LEDs will turn on as soon as the OBD II Smartbox is connected and you start the igni tion The brightness of the LEDs depends on the nature of the signal it s pursuing This OBD II Smartbox can identify immediately the protocol used The better way to identify the protocol in use is to set up the scan tool or interface in to LIVE DATA This will lead in a constant data stream between...

Page 9: ...ations VW To protect the Scan tool such as aftermarket radios on VW s GM Transmitter Programming on some GMs Honda Set the ECM in SCS mode with your scan tool connected Lexus Help diagnose electronics systems Sirius GPS on pin 6 and 14 Bosch Troubleshoot Bosch controllers that short to ground Proton needs to short pin 1 to ground in order to access into OBD2 functions Toyota Avanza the base RPM ca...

Page 10: ... 3 Attach the battery clip to an external battery not the battery from the same car N N If the external battery voltage is above 12V the battery volt indicator LED on the Data saver cable will light up Now it is ready to proceed for replacing the car battery 4 After job done remove the battery clips from the external battery unplug OBD II Smartbox from the car N N The data saver cable comes with s...

Page 11: ... MAHLE Notes OBD II Smartbox 11 en 4 Notes ...

Page 12: ...2017 10 30 035 82569 00 MAHLE Aftermarket Inc 10 Innovation Drive York PA 17402 USA 717 840 0678 www servicesolutions mahle com ...

Reviews: