1998 Chevrolet Prizm LSi, Automatic, A245E/MS7FACTORY 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

Scan Tool Parameters (1) Typical Data Value
A/C Switch Off
Base Injector PWM Cylinder No. 1 2.2-4.8 mS
Command A/C Off
Decel Fuel Mode Inactive
Diagnostic Mode Normal
ECT 176-194°F (80-90°C)
Electrical Load No
Engine Load 19.7-49.3%
Engine Speed 650-750 RPM
Engine Speed At Misfire Zero
Fuel Trim (Long Term) (2) -20-+20%
Fuel Trim (Short Term) (2) -20-+20%
HO2S-1 Varies
HO2S-1 Lean/Rich Response Time 0-1000 mS
HO2S-1 Rich/Lean Response Time 0-1000 mS
HO2S-2 Varies
IAC Duty Cycle 27-47%
IAT 68-95°F (20-35°C)
IGN. Cycle Counter 0-2000
Load At Misfire (3) 0.00 G/Rev
Loop Status Closed
MAP (Pressure) (4) 4.2-6.8 psi (29-47 kPa)
MAP (Voltage) (4) 1.32-1.90 volts
MIL Requested By DTC No
Misfire Current Cyl #1 Zero
Misfire Current Cyl #2 Zero
Misfire Current Cyl #3 Zero
Misfire Current Cyl #4 Zero
Park Neutral Position (PNP) Switch (5) Park Or Neutral
Powertrain DTC Zero
Spark 8-18°
Starter Switch Released
TCC Brake Switch (5) Released
TCC Solenoid (5) Off
Total Fuel Trim Varies
Total Misfire Current Count Zero
TP Sensor 11%
Vehicle Speed Zero MPH (Zero km/h)
(1) Scan tool parameters are with vehicle at idle, upper radiator hose hot, closed throttle, transaxle in Park or Neutral, computer controls in closed loop and accessories off.
(2) Counts are 128 and vary.
(3) Engine load at misfire is measured in grams per revolutions.
(4) Varies with barometric pressure and altitude.
(5) 4-speed automatic transmission only.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • 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.
  • • You are not confident in the next step or safety outcome.

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