1999 Chevrolet Prizm Base, StandardFACTORY OEM SERVICE PROCEDURE

Scan Tool Data

NOTE: Information contained in the following tables is typical of readings taken on a vehicle with engine idling at normal operating temperature, throttle closed, transmission in Park or Neutral, system in closed loop status, and all accessories off (except as noted in tables). For additional information, see scan tool owner's manual.
SCAN TOOL DATA VALUES (METRO)

Parameter Units Displayed Typical Value
Air Conditioning On/Off Off
BARO kPa 89-99 (Varies W/Barometric Pressure & Altitude)
Battery Voltage Volts 12-14
Closed Throttle Switch Idle/Not Idle Idle
Desired Idle Speed
1.0L RPM 850
1.3L RPM 750
ECT °F (°C) 176-212 (80-100)
EGR Solenoid Vacuum Valve (1) On/Off Off
EGR By-Pass Solenoid (1) On/Off Off
Electrical Load Signal Yes/No No (W/Accessories Off)
Engine Coolant Fan On/Off Varies W/ECT
Engine Speed
1.0L RPM 800-900
1.3L RPM 700-800
Engine Load Percent 3-5
EVAP Duty Cycle Percent 0-100
EVAP Density Trim Counts 0-14 (Varies)
EVAP Tank Pressure Control Solenoid On/Off Varies
EVAP Vent Solenoid On/Off Off (W/ECT Less Than 176°F/80°C)
Fuel Cutoff Signal Yes/No No
Fuel Injector PWM
1.0L Milliseconds 0.8-2.3
1.3L Milliseconds 2-4
Fuel Level Percent Varies W/Fuel Level
Fuel Pump On/Off On
Fuel Tank Pressure mm Hg 0.0 (W/Fuel Cap Removed)
HO2S (Sensor 1) Millivolts 50-950
HO2S (Sensor 2) Millivolts 50-950
HO2S (Sensor 1) Ready Yes/No Yes
HO2S (Sensor 2) Ready Yes/No Varies
IAC Duty Cycle (2) Percent 8-35
IAT °F (°C) Varies W/Underhood & Ambient Temp.
ISC Duty Cycle (1) Percent 20-40
Long Term FT Counts 128 (Varies)
Long Term FT Percent -15 - +15 (Varies)
Loop Status Open/Closed Closed
MAP (Pressure) kPa 29-47
MAP (Voltage) Volts 1.32-1.90 (Varies W/Vacuum, Barometer & Altitude)
Park/Neutral Position (PNP) Switch (A/T) (2) P-N/R-D-L P-N
Power Steering Switch (2) On/Off Off (Wheels Straight)
Short Term FT Counts 128 (Varies)
Short Term FT Percent -20 - +20 (Varies)
Spark Advance Adjust Test Switch On/Off Off
Spark
1.0L Degrees -1 - +18
1.3L Degrees 9-15
Starter Switch Released/Cranking Released
Total Fuel Trim Percent -35 - +35 (Varies)
TP Angle Percent 7-18
TP Sensor Volts 0.42-1.15 Volts
Vehicle Speed km/h/MPH 0
(1) 1.0L only.
(2) 1.3L only.
SCAN TOOL DATA VALUES (PRIZM)

Parameters Units Displayed Typical Value
A/C Switch On/Off Off
Base Injector PWM Cylinder No. 1 Milliseconds 2.2-4.8
Command A/C On/Off Off
Decel Fuel Mode Active/Inactive Inactive
Diagnostic Mode Normal/Check Normal
ECT °F (°C) 176-194 (80-90)
Electrical Load Yes/No No
Engine Load Percent 19.7-49.3
Engine Speed RPM 650-750
Engine Speed At Misfire RPM 0
EVAP Pressure Switching (Solenoid) On/Off On
Fuel Pump On/Off On
HO2S (Sensor 1) Millivolts Varies
HO2S (Sensor 2) Millivolts Varies
HO2S-1 Lean/Rich Response Time Milliseconds 0-1000
HO2S-1 Rich/Lean Response Time Milliseconds 0-1000
IAC Duty Cycle Percent 27-47
IAT °F (°C) Varies W/Underhood & Ambient Temp.
Ignition Cycle Counter Counts 0-2000
Load At Misfire Grams/Revolution 0.00
Long Term FT Counts 128 (Varies)
Long Term FT Percent -20 - +20
Loop Status Open/Closed Closed
MAP (Pressure) kPa 28-47 (Varies W/Barometric Pressure & Altitude)
MAP (Voltage) Volts 1.32-2.20 (Varies W/Barometric Pressure & Altitude)
MIL Requested By DTC Yes/No No
Misfire Current Cylinder No. 1 Counts 0
Misfire Current Cylinder No. 2 Counts 0
Misfire Current Cylinder No. 3 Counts 0
Misfire Current Cylinder No. 4 Counts 0
PNP (A/T) P-N/R-D-L P-N
Powertrain DTC Counts 0
Short Term FT Counts 128 (Varies)
Short Term FT Percent -20 - +20
Spark Degrees 8-18
Starter Switch Released/Cranking Released
TCC Brake Switch (A/T) Released/Applied Released
TCC Solenoid (A/T) On/Off Off
Total Fuel Trim Counts .25-.75 (Varies)
Total Misfire Current Count Counts 0
TP Angle Percent 8-11
Vehicle Speed km/h/MPH 0
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  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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