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.
SCAN TESTER - TEST DATA PARAMETERS
| 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.); Off (air to atmosphere). |
| AIR Switching Solenoid | On/Off | On (to exhaust manifold); 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/closeD100/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). |
| Loop Status Open/Closed | 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 (M/T) | RPM | Spec. +/- 50 RPM In Neutral. |
| RPM (A/T) | RPM | Spec. +/- 25 RPM In Drive. |
| 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 Upshift Light | On/Off | On when activated. |
| (Man. Trans.) | On/Off | Off |
| VSS | MPH | 0-actual. |
| 3rd Gear Switch | On/Off | On/3rd & 4th gear. |
| 4th Gear Switch | On/Off | On/4thgear. |
NOTE:
In some of the diagnostic and trouble shooting charts the Assembly Line Data Link (ALDL) may also be referred to as the Assembly Line Communication Link (ALCL). This is the same test point for connection of aftermarket "Scan" testers.