Scan Tester - Test Data Parameters
NOTE:
Information in the following tables 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.
PORT FUEL INJECTION
| 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 Control | Norm.Div. | Normal. |
| AIR Switching | Port/Con. | 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. |
| Fan | On/Off | Off Below 226°F (108°C). |
| Fuel Backup | Yes/No | Yes when engaged. |
| IAC | Counts | 1-40. |
| 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. |
| Knock Signal | Yes/No | Yes when knock exists. |
| MAF | Mil./Sec | 4-7. |
| MAT Temperature | °C | 10-90°. |
| Open/Closed Loop Status | Ol/Cl | Closed/Open during extended idle. |
| O2 Sensor | Millivolts | 1 (lean) to 1000 (rich). |
| P/N Switch | P/N/RDL | Park/Neutral. |
| P/S Switch | Norm/Hi | Normal. |
| PROM I.D. | PROM # | Original factory number. |
| Pulse Width | Mil./Sec. | 1-4. |
| RPM | RPM | Spec. +/- 50 RPM Drive (Auto.). Spec. +/- 100 RPM Neut. (man.). |
| Spark Advance | # of Deg. | Varies. |
| TCC | On/Off | Off (On with command). |
| TPS | Volts | .42-.62. |
| 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. |
| 1st Gear Switch | Yes/No | Yes (in 1st gear). |
| 3rd Gear Switch | Yes/No | Yes (in 3rd gear). |
| 4th Gear Switch | Yes/No | Yes (in 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.