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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 The car would not run correctly if the ecu was fried chicken.
#99 ASTRO VAN BAD ECU DIAGNOSTIC PORT CODE#
I do have 2 questions Is the scanner an OBD1 reader or an OBD2 reader Have you used it on the car to read a code before You might have bent a prong on the cable. TEST 5: Connect positive DMM lead to either DLC bias terminals Connect negative DMM lead to the ground terminal The ecu is actually on the side of the glove box next to the passenger side door and the side vent. This tests the ECM Voltage supply as no power may be caused by a blown lighter fuse During certain repair procedures, the status of these emission systems is reset by the repair technician. What now Why your vehicle may not be ready: Your vehicle’s On-Board Diagnostic (OBD) computer reviews the status of the emission systems within the vehicle.
#99 ASTRO VAN BAD ECU DIAGNOSTIC PORT SERIAL#
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 So, your vehicle is not ready for an OBD Test. (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. Scan Tool, Diagnostic, OBD2, Reads/Clears Codes, Phone App Compatible, Dongle, Each. These control modules act as a center hub, where information from other systems and sensors are collected and used to control their respective systems in. GM cars produced in 2003-2006 use J1850-VPW interface or CAN.
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Most GM cars produced in 1996-2003 use J1850-VPW interface. NOTE: For other PCM pin-out charts, take a look at the following: 1993 PCM Pin Out Chart (GM 4.3L, 5.0L, 5.7L GAS w/ 4L60-E). Should be suitable for most modern GM cars - Buick, Cadillac, Chevrolet, Daewoo. In this article, you'll find the Pin Out descriptions of the 4 PCM Connectors for the 1998-1999 GM 4.3L, 5.0L or 5.7L Engines. If the scan tool does not receive data from an OBD II vehicle Some of the well-known control modules in a vehicle include the Engine Control Unit (ECU) or the Engine Control Module (ECM), Powertrain Control Module (PCM) and the Body Control Module (BCM). This pinout is associated with 47 compatible devices or models.