Scan Data
NOTE:
Information in the following table is typical readings taken on vehicle with engine idling, upper radiator hose hot, closed throttle, transmission in Park or Neutral, "closed loop" status achieved and all accessories off (except as noted in tables). Data parameters are updated every 1 1/4 seconds. On systems using P-4 computers, parameter updates are virtually instantaneous. Not all devices & systems are used on all models.
SCAN DATA
| Tester Position | Units Measured | Nominal Data Value |
|---|---|---|
| A/C Clutch | On/Off | Off (On with A/C) |
| A/C Request | Yes/No | No/Yes (with request) |
| AIR Divert Solenoid | On/Off | On (air to switching sol.) |
| AIR Divert Solenoid | On/Off | Off (air to atmosphere) |
| AIR Switching Solenoid | On/Off | On (to exhaust manifold) |
| AIR Switching Solenoid | On/Off | Off (to catalytic converter) |
| BARO | Volts | 3-4.5 |
| Battery Voltage | Volts | 13.5-14.5 |
| Block Learn | Counts | 118-138 (128 normal) |
| Brake Switch | On/Off | On when engaged |
| Canister Purge Sol. | On/Off | On/engine cold (idle some) |
| Clear Flood | On/Off | ***See tester manual** |
| Coolant Fan | On/Off | Off below 216°F (102° C) |
| Coolant Temp. | °C | 85-105° (norm.temperature) |
| Crank RPM | RPM | 100-900 |
| Cross Counts | Counts | 0-255 |
| Cruise Control Switch | On/Off | when engaged |
| EGR Solenoid | On/Off | On when energized |
| EGR Duty Cycle | 0-100% | 0/closed-100/fully open |
| Fan Relay | On/Off | On when energized |
| Fan Request | On/Off | On with request |
| Fuel Backup | Yes/No | Yes when engaged |
| IAC | Counts | 0-50 |
| Ignition/Crank | On/Off | On with ignition/crank |
| Injector Pulse Width | Mil./Sec | .8-3.0 |
| INT (Integrator) | Counts | 110-145 (128 normal) |
| Knock Retard (ESC) | Counts | 0-255 |
| Knock Signal | Yes/No | Yes when knock exists |
| MAT Temperature | °C | 10-90° |
| MAP | Volts | 1 (idle)to4.5(WOT) |
| Open/Closed Loop Status | Ol/Cl | Closed/Open during extended idle |
| O2 Sensor | Millivolts | 100 (lean) to 999 (rich) |
| P/N Switch | P/N/RDL | Park/Neutral |
| P/S Switch | Norm/Hi | Normal |
| PROM I.D. | PROM # | Original factory number |
| RPM | RPM | Spec. ± 25 RPM Drive (Auto.) |
| RPM | RPM | Spec. ± 50 RPM Neut. (man.) |
| Spark Advance | # Of Deg. | Varies |
| TCC | On/Off | Off (On with command) |
| TPS | Volts | 1.25 (idle) to 5.0 (WOT) |
| Throttle Angle | 0-100% | 0 (idle) to 110 (WOT) |
| Trouble Codes | Code # | No Codes |
| Turbo Boost | On/Off | On when activated |
| Upshift Light (Man. Trans.) | On/Off | Off |
| VSS | MPH | 0-actual |
| 3rd Gear Switch | On/Off | On/3rd & 4th gear |
| 4th Gear Switch | On/Off | On/4th gear |
NOTE:
This ECM voltage chart can be used with a digital voltmeter to help save time in diagnosis. Voltages on the car being tested my vary slightly from these due to battery or alternator charging level.