| Table 1: | Body Control Module (BCM) |
| Table 2: | Powertrain Control Module (PCM) |
The scan tool data lists contain all the instrument panel, gages, and console related parameters that are available on the scan tool. The parameters in the list are arranged in alphabetical order. The data list column indicates the location of the parameter within the scan tool menu selections.
Use the scan tool data lists as directed by a diagnostic table or in order to supplement the diagnostic procedures. Begin all of the diagnostic procedures with the Diagnostic System Check - Instrument Cluster or Diagnostic System Check - Audible Warnings .
Use the scan tool data lists only after the following is determined:
| • | There is no published DTC procedure nor published symptom procedure for the customer concern. |
| • | The DTC or symptom procedure indicated by the diagnostic system check does not resolve the customer concern. |
The typical data values are obtained from a properly operating vehicle under the conditions specified in the first row of the scan tool data list table. Comparison of the parameter values from the suspect vehicle with the typical data values may reveal the source of the customer concern.
Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
Operating Conditions: Ignition On/Engine OFF/Headlamps Off/Doors Closed/Park Brake Unapplied/Seat Belt Buckled | |||
ABS Lamp | SPI Data | On/Off | Off |
Brake Warning Lamp | SPI Data | On/Off | Off |
Cruise Lamp | SPI Data | On/Off | Off |
Division | SPI Data | Chevrolet/Invalid | Chevrolet |
Door Ajar Lamp | SPI Data | On/Off | Off |
English/Metric State | SPI Data | English Units/Metric | varies |
Fuel Gage Position | SPI Data | Counts | 0-255 Counts varies |
Gear Position | SPI Data | Drive/ Drive 1/ Drive 2/ Drive 3/ Neutral/ Reverse/Park | Park |
Generator Lamp | SPI Data | On/Off | On |
Hi Beam Lamp | SPI Data | On/Off | Off |
High Coolant Temp Lamp | SPI Data | On/Off | Off |
Key In Ignition | BCM Data | Yes/No | Yes |
Low Coolant Lamp | SPI Data | On/Off | Off |
Low Fuel Lamp | SPI Data | On/Off | Off |
Low Oil Lamp | SPI Data | On/Off | Off |
Low Washer Lamp | SPI Data | On/Off | Off |
Oil Pressure Lamp | SPI Data | On/Off | On |
Park Lamp Input | Lamp Status | On/Off | Off |
Phase Lock Loop | SPI Data | OK/Fault | OK |
Seat Belt Lamp | SPI Data | On/Off | Off |
Service Veh. Soon Lamp | SPI Data | On/Off | Off |
SPI Data Input | SPI Data | Low/High | varies |
SPI Data Output | SPI Data | Low/High | varies |
SPI Serial Data Status | SPI Data | OK/Fault | OK |
Tach Signal | SPI Data | Active/Inactive | Inactive |
Temp. Gage Position | SPI Data | Counts | 0-255 Counts varies |
Theft System Lamp | SPI Data | On/Off | On |
VSS Signal | SPI Data | Active/Inactive | Inactive |
Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
Operating Conditions: Engine Idling/Normal Operating Temperature | |||
ECT Sensor | Engine Data 1 Engine Data 2 EVAP Data | Celsius (Fahrenheit) | 85-105°C (185-220°F) |
Engine Oil Level Switch | Engine Data 2 | OK/Low | OK |
Engine Oil Pressure Switch | Engine Data 2 | OK/Low | OK |
Engine Speed | Engine Data 1 Engine Data 2 EVAP Data | RPM | 100 RPM from Desired Idle Speed |
Fuel Tank Level Remaining | EVAP Data | Percent | 0-100% varies |
Vehicle Speed Sensor | Engine Data 1 EVAP Data | miles per hour (kilometers per hour) | 0 km/h (0 mph) |
