GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Cell 21: PCM Power and Grounds


Object Number: 187376  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: MIL Control, DLC
OBDII Symbol Description Notice
Cell 10: PCM, DIS, and FOG LAMPS Fuses
Cell 10: PCM, DIS, and FOG LAMPS Fuses
Cell 10: PCM/VATS and BOSE Fuses
Cell 10: PCM/VATS and BOSE Fuses
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice
Ground Distribution Schematics
Figure 2:

Cell 21: MIL Control, DLC


Object Number: 187378  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: Ignition Control Module
Cell 21: PCM Power and Grounds
OBD II Symbol Description Notice
Power Distribution Schematics
Power Distribution Schematics
Power Distribution Schematics
Power Distribution Schematics
Power Distribution Schematics
Powertrain Control Module Connector End Views
Ground Distribution Schematics
Handling ESD Sensitive Parts Notice
Ground Distribution Schematics
Data Link Connector Schematics
Handling ESD Sensitive Parts Notice
Figure 3:

Cell 21: Ignition Control Module


Object Number: 187381  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: Fuel Pump Control, Theft Deterrent
Cell 21: MIL Control, DLC
OBDII Symbol Description Notice
Handling ESD Sensitive Parts Notice
Power Distribution Schematics
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice
Ground Distribution Schematics
Engine Controls Connector End Views
Figure 4:

Cell 21: Fuel Pump Control, Theft Deterrent


Object Number: 187385  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: Fuel Injectors
Cell 21: Ignition Control Module
OBDII Symbol Description Notice
Power Distribution Schematics
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Ground Distribution Schematics
Ground Distribution Schematics
Powertrain Control Module Connector End Views
Figure 5:

Cell 21: Fuel Injectors


Object Number: 187387  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: IAT, ECT, TP, MAP Sensors
Cell 21: Fuel Pump Control, Theft Deterrent
OBDII Symbol Description Notice
Power Distribution Schematics
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice
Figure 6:

Cell 21: IAT, ECT, TP, MAP Sensors


Object Number: 187391  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: MAF, EGR, EVAP Purge, F/T Pressure Sensor
Cell 21: Fuel Injectors
OBDII Symbol Description Notice
Handling ESD Sensitive Parts Notice
Cell 21: MAF, EGR, EVAP Purge, F/T Pressure Sensor
Cell 21: MAF, EGR, EVAP Purge, F/T Pressure Sensor
Cell 21: MAF, EGR, EVAP Purge, F/T Pressure Sensor
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice
Figure 7:

Cell 21: MAF, EGR, EVAP Purge, F/T Pressure Sensor


Object Number: 187393  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: Converter Heated Oxygen Sensors
Cell 21: IAT, ECT, TP, MAP Sensors
OBDII Symbol Description Notice
Power Distribution Schematics
Power Distribution Schematics
Power Distribution Schematics
Power Distribution Schematics
Cell 21: IAT, ECT, TP, MAP Sensors
Cell 21: IAT, ECT, TP, MAP Sensors
Ground Distribution Schematics
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice
Figure 8:

Cell 21: Converter Heated Oxygen Sensors


Object Number: 187395  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: Front, Rear Heated Oxygen Sensors
Cell 21: MAF, EGR, EVAP Purge, F/T Pressure Sensor
OBDII Symbol Description Notice
Power Distribution Schematics
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice
Ground Distribution Schematics
Figure 9:

Cell 21: Front, Rear Heated Oxygen Sensors


Object Number: 187397  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: PSP, IAC Valve, Coolant Level Switch
Cell 21: Converter Heated Oxygen Sensors
OBDII Symbol Description Notice
Power Distribution Schematics
Power Distribution Schematics
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice
Power Distribution Schematics
Power Distribution Schematics
Handling ESD Sensitive Parts Notice
Ground Distribution Schematics
Power Distribution Schematics
Figure 10:

Cell 21: PSP, IAC Valve, Coolant Level Switch


Object Number: 187398  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: Cruise Control Module
Cell 21: Front, Rear Heated Oxygen Sensors
OBDII Symbol Description Notice
Cell 10: IGN 3 Fuse, Ignition Switch (Oldsmobile)
Power Distribution Schematics
Ground Distribution Schematics
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice
Figure 11:

Cell 21: Cruise Control Module


Object Number: 187400  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: TCC Switch, Transaxle Solenoids
Cell 21: PSP, IAC Valve, Coolant Level Switch
OBDII Symbol Description Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Engine Controls Schematic References
Handling ESD Sensitive Parts Notice
Figure 12:

Cell 21: TCC Switch, Transaxle Solenoids


Object Number: 187412  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: Transaxle - Sensors and TR Switch
Cruise Control Schematics
OBDII Symbol Description Notice
Power Distribution Schematics
Engine Controls Schematic References
Engine Controls Schematic References
Handling ESD Sensitive Parts Notice
Powertrain Control Module Connector End Views
Figure 13:

Cell 21: Transaxle -- Sensors and TR Switch


Object Number: 187418  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: Engine Oil Level Switch, Generator, EBTCM
Cell 21: TCC Switch, Transaxle Solenoids
OBDII Symbol Description Notice
Handling ESD Sensitive Parts Notice
Cell 21: IAT, ECT, TP, MAP Sensors
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice
Figure 14:

Cell 21: Engine Oil Level Switch, Generator, EBTCM


Object Number: 187425  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: PNP Switch, Shift Select Switch
Cell 21: Transaxle - Sensors and TR Switch
OBDII Symbol Description Notice
Handling ESD Sensitive Parts Notice
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice
Figure 15:

Cell 21: PNP Switch, Shift Select Switch


Object Number: 187427  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: Engine Oil Level Switch, Generator, EBTCM
OBDII Symbol Description Notice
Ground Distribution Schematics
Ground Distribution Schematics
Ground Distribution Schematics
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice
Figure 16:

Cell 21: A/C Compressor Controls


Object Number: 187440  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: A/C Sensors
Cell 21: Engine Oil Level Switch, Generator, EBTCM
OBDII Symbol Description Notice
Power Distribution Schematics
Power Distribution Schematics
Handling ESD Sensitive Parts Notice
Power Distribution Schematics
Powertrain Control Module Connector End Views
Ground Distribution Schematics
Ground Distribution Schematics
Handling ESD Sensitive Parts Notice
Figure 17:

Cell 21: A/C Sensors


Object Number: 187457  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: Cooling Fans
Cell 21: A/C Compressor Controls
OBDII Symbol Description Notice
Ground Distribution Schematics
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice
Figure 18:

Cell 21: Cooling Fans


Object Number: 187517  Size: FS
Engine Controls Components
Powertrain Control Module Description
Cell 21: PNP Switch, Shift Select Switch
Cell 21: A/C Sensors
OBDII Symbol Description Notice
Power Distribution Schematics
Power Distribution Schematics
Powertrain Control Module Connector End Views
Ground Distribution Schematics
Handling ESD Sensitive Parts Notice