The SELECT BRAND function is mainly working on 2000 or newer Japanese cars that support the JOBD protocol it only supports Read Codes and Erase Codes for Engine System. It also works on Japanese vehicles that other code reader can not do, especially work on MOST 2000 or newer support JOBD protocol OBD II SYSTEM & SELECT BRAND - For most 16pin interface OBD II/EOBD Vehicle: Supports Read Codes, Erase Codes, I/M Readiness, Data Stream, Freeze Frame and vehicle Information total of 6 module functions. ENHANCED COMPATIBILITY - Works on most from 1996 US-based, 2002 EU-based, 2005 Asian-based or newer OBD II & CAN domestic or import vehicles.An open ground or power (B+) circuit on a fuel-injected engine removes power from the ECM and prevents the engine from starting.ĪDDITIONAL INFORMATION: Old PCM is fried, see the attached picture when attempts are made to communicate after fixing the wiring problem.Ĭheck the fuse box (Power Panel), it might be the reason why PCM isn’t able to receive power as well as communicate. With the ignition key ON and bus activity, the voltage should vary from 0 to 5V depending on the amount of bus activity!ĪDDITIONAL NOTES PCM receives battery voltage (B+) through a fuse or fusible link. With the ignition key ON and no bus activity, BUS + should read 0V BUS should read 5V
TEST 5: Connect positive DMM lead to either DLC bias terminals Connect negative DMM lead to the ground terminal This tests the ECM Voltage supply as no power may be caused by a blown lighter fuse With the Ignition on, the voltage on class 2 serial data pin should be 5V or fluctuating between 3.5V and 5.0V, If open, PCM cannot transmit data to the scan tool.Ĭonnect positive DMM lead to DLC Battery + terminal Connect negative DMM lead to battery ground terminal (does not apply to a Mazda MPV)Ĭonnect the positive DMM lead to the class 2 Serial Data pin and the negative DMM lead to either pin 4 or pin 5 or a known good ground NOTE: An open circuit or high ground resistance means that the PCM will never enter diagnostic mode.
With the ignition on, the voltage drop across the ground terminal should be 0.1 Volts or less Do not connect to the body or chassis ground but to the battery terminal directly. TEST 1: Connect the positive DMM lead to DLC pin 4 and the negative DMM lead to the negative battery terminal, using jumper wires if necessary. If the scan tool does not receive data from an OBD II vehicle
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