GM 12200411
PCM

The service programming system (SPS) lets technicians program control modules by using the data link connector (DLC) while they access diagnostic information that dtcs and data through the same serial data circuit as scanning tools. A control module maintains two memory types including electrically erasable programmable read only memory (EEPROM) that stores information like vehicle identification number (VIN) and crankshaft variation learned position and control module security data among others and flash read only memory for larger storage capacity that programmer completely replaces during programming operations. Programming with tech 2 uses remote and pass thru methods while obpa enables remote and off-board pass thru methods but needs the control module in place according to the specified protocols. The vehicle demands a battery voltage range from 12 to 16 volts with no charging problems before programming and all systems loading the battery must be disabled including daytime running lights and hvac systems and engine cooling fans. A programming session needs the Ignition Switch set precisely as the scan tool indicates and requires firm rs-232 cable connections and all dlc connections to remain stable. Tool harness disturbance during programming should be avoided to prevent failures and protect the hardware. The powertrain modifications from programming cause the control module to perform learn procedures for fuel trim correction along with idle air control (IAC) learned position and automatic transmission shift adapts. Replacement of a control module will require service personnel to perform a crankshaft variation learn procedure together with engine oil life reset procedure and idle learn procedure while following the inspection/maintenance complete system set procedure, vehicle theft deterrent password learn procedure, and throttle position (TP) sensor learn procedure.

The procedure for alternative fuels Engine Control Module (AF ECM) replacement starts with disconnecting the negative Battery Cable and removing the bolt from the coolant recovery reservoir before putting the reservoir aside. You should depress the release tab on the alternative fuels ecm mounting bracket while lifting the ecm out of its bracket position. The ecm electric connectors (2, 4) need to be disconnected after removing their connector position assurance locks. Proceed with installing the ecm adapter bracket inside the vehicle when bracket removal is not needed while placing it correctly on the loose forward bolt. Install the rear ecm adapter bracket bolt and the fender support rod which are attached by bolt . Next follow with installing the rod between fender and adapter bracket . Tighten the front ecm adapter bracket bolt to 24 n.m (18 lb ft) while the rear ecm adapter bracket bolt reaches 24 n.m (18 lb ft) and the support rod bolt at the fender reaches 24 n.m (18 lb ft) followed by the support rod bolt at the adapter bracket reaching 12 n.m (108 lb in). The ecm mounting bracket must be connected to the ecm adapter bracket through four bolts which should be tightened at 12 n.m (106 lb in). Insert the electrical connectors (2, 4) to the alternative fuels ecm before applying the connector position assurance locks. Fasten the alternative fuels ecm into the mounting bracket, place the coolant recovery reservoir properly before installing the mounting bolt with torque set at 11 n.m (97 lb in). Reconnect the negative Battery Cable while you might need to program the ecm's software with the required alternative fuels programming.

The service programming system (SPS) allows technicians to program control modules through the data link connector (DLC) by utilizing the same serial data circuit that scan tools use for diagnostic trouble code (DTC) retrieval along with data reading. Control modules incorporate electrically erasable programmable read only memory (EEPROM) that saves information like vehicle identification number (VIN) along with crankshaft variation learned position and control module security information and software/calibrations identification numbers yet flash read only memory possesses higher storage capacity since programming blanks it entirely to insert new content. The programming procedures consist of remote and pass thru options with (Tech 2) devices alongside off-board remote and off-board pass thru capabilities and (OBPA). Before programming a control module must start only during cases where module replacement or new software release is necessary and when checking that system voltage falls between 12 to 16 volts and charging systems function properly and no battery charger is attached. First disable battery-loading systems then put the Ignition Switch correctly and double-check all tool connections remain secure. Tool harness disturbance should be avoided throughout programming steps to prevent both failures and equipment damage. After programming, the powertrain may operate differently, requiring the control module to re-learn values such as fuel trim correction, idle air control (IAC) learned position, and automatic transmission shift adapts, while additional service procedures may be necessary if a control module is replaced, including the crankshaft variation learn procedure, engine oil life reset procedure, idle learn procedure, inspection/maintenance complete system set procedure, vehicle theft deterrent password learn procedure, and throttle position (TP) sensor learn procedure.

Perform remote programming on the Engine Control Module by beginning with turning off the ignition then connecting the Tech 2 to the data link connector (DLC). The first step requires turning ON the ignition while allowing the engine to remain switched OFF. During the process ensure all vehicle accessories are deactivated. You must access Service Programming on the Tech 2 while following the provided vehicle identification requests. Begin the programming stage by selecting the module type as well as its programming type while checking the displayed VIN against the actual VIN of the vehicle; record the actual VIN for future correction through the Techline terminal. Service Programming must be exited before the Tech 2 is switched OFF while removing the connector from the vehicle. To start connect the Tech 2 to the Techline terminal followed by opening Service Programming and selecting the device as Tech 2. Check the VIN that displays on the screen and make changes if needed before selecting the module type and choosing between Normal programming or Vehicle Configuration Index when the VIN is missing or Reconfigure for tire size modifications. Start by choosing the correct calibration file while verifying all connections are tight before selecting the Reprog command for the download process toward the Tech 2 component. Following the download process users must disable the Tech 2 before detaching it from the Techline terminal and then plug it into the DLC port. Switch ON the Tech 2 while setting the ignition OFF followed by choosing Service Programming from the interface. Before trying to reprogram the control module ensure that all PCM and DLC connections are secure plus both the programming procedure and the techline operating software are up to date. Turning off the ignition during an interrupted or unsuccessful procedure should be avoided. A replacement becomes necessary when programming the control module fails. Users must select the Program option followed by ending the Service Programming interface. After switching OFF the ignition for 30 seconds also follow by turning OFF the Tech 2 then execute the CKP System Variation Learn Procedure followed by the Inspection/Maintenance (I/M) Complete System Set Procedure and Programming Theft Deterrent System Components if a control module was replaced.

A technician can program control modules through the data link connector (DLC) with an sps system using the serial data circuit that allows retrieval of diagnostic trouble codes (DTCs) and data display. Control modules include electrically erasable programmable read only memory (EEPROM) with stored information including vehicle identification number (VIN) and crankshaft variation learned position and control module security information and software/calibrations identification numbers while also using flash read only memory for its larger storage capacity requiring complete data erasure before programming. There exist four programming approaches which involve both tech 2 and obpa and off-board methods of remote and pass-through programming. Control module programming must occur only when directed to perform an exchange or when software updates become available and after confirming a power supply range from 12 to 16 volts without a charging problem or battery connection. Zonal and interface connections require inspection to confirm proper tool security before disabling power-consuming systems and positioning the ignition at the right setting. Maintain all tool interfaces secure throughout programming to prevent disturbance of tool harnesses. After programming, the powertrain may operate differently, requiring the control module to re-learn values such as fuel trim correction, idle air control (IAC) learned position, and automatic transmission shift adapts, while additional service procedures may be necessary if the control module is replaced, including the crankshaft variation learn procedure, engine oil life reset procedure, idle learn procedure, inspection/maintenance complete system set procedure, vehicle theft deterrent password learn procedure, and throttle position (TP) sensor learn procedure.

A diagnostic tool should be used first for clearing DTCs before starting an attempt to start the engine for servicing the Engine Control Module. Try to service program the engine once more when the machine does not start correctly or operates badly. The vehicle requires verified controls from the DLC to the PCM together with up-to-date Techline software and correct calibration part number (XXXX). The following step involves trying to program the control module. Programming of the control module (XXXX) should be followed by replacement of the module when it fails so you must properly program the new module.

The control module may need to re-learn values such as fuel trim correction, Idle Air Control (IAC) learned position, and automatic transmission shift adapts.

Loosen the PCM rear retaining fastener without removing it, using it as an anchor for the outer bracket.

EEPROM retains certain learned values such as the vehicle identification number (VIN), crankshaft variation learned position, software/calibrations identification numbers, and control module security information.

The ignition must be in the correct position as prompted by the scan tool, and it is crucial not to change the ignition switch position during programming unless instructed.

Verify the displayed VIN against the vehicle VIN; if they do not match, note the actual VIN and correct it at the Techline terminal.

It must be replaced.

All tool connections, including the RS-232 cable and connections at the DLC, must be secure.

EEPROM retains learned values such as the vehicle identification number (VIN), crankshaft variation learned position, software/calibrations identification numbers, and control module security information.