Electrical Specifications

The "SCAN" data values, listed below, are typical for the test parameters of a "TECH-1" or equivalent "scan" tool connected to the ALDL diagnostic connector, and under the following conditions:

Engine running at idle/closed throttle.
Engine at normal operating temperature.
System operating in "closed-loop".
Accessories "OFF".
Brake NOT applied.

Many of the parameters show "data" rather than voltage or resistance values, and cannot be read using a volt/ohm meter.


PARAMETER UNITS TYPICAL VALUE

Engine Speed RPM ± 100 RPM from desired idle
Desired Idle RPM varies W/temperature
Coolant Temp °C/°F Varies 85-109°C (185-223°F)
Intake Air Temp °C/°F Varies W/Under hood temperature 10-90°C (50-195°F)
MAP kPa/Volts 29 - 48 kPa/1 - 2 volts)
BARO kPa/Volts 70 - 100 kPa/3.5 - 4.5 volts depending on altitude and barometric pressure
Throttle Position Volts 0.29 - 0.98
Throttle Angle Percent (%) 0%
Oxygen Sensor Millivolts (mV) Varies (100-900)
Open/Closed Loop Open/Closed Loop Closed Loop (may switch to "Open Loop" after extended idle)
Left and Right Fuel Integrator Counts varies
Left and Right Block Learn Counts 118 - 138
Block Learn Cell Cell # 16 - 18 (depending on air flow and engine speed.)
Block Learn Enable Yes/No Yes
Spark Advance Degrees Advance Varies (ECM Controlled)
Vehicle Speed mph/kph 0
Knock Retard Degrees 0°
Knock Signal Yes/No No
Low Resolution Signal Milliseconds Varies
High Resolution Signal Counts Continuous Counting Between 0 - 255
Injector Pulse Width Milliseconds 1-4 (varies)
Idle Air Control Counts 5 - 50
Learned IAC Counts 5 - 50
Exhaust Recirculation Percent (%) 0%
ASR Control Yes/No No
Batt/Ign Volts Volts 12.5-14.5
Converter Protection Yes/No No
A.I.R. Divert/Port Divert
Purge Duty Cycle Percent 0%
QDM 1, QDM 2 OK/Fault OK
QDM 3 OK/Fault OK
ESC Sensors OK/Not OK OK
Current EST OK/Open/Grounded OK
Left Injector Fault Yes/No No
Right Injector Fault Yes/No No
Fan 1, Fan 2 On/Off Off (coolant temperature below 109°C/223°F)
On (coolant temperature above 109°C/223°F)
A/C Request Yes/No No
A/C Clutch On/Off Off
A/C Status On/Off Off
FEDS/Pass Key Enabled/Disabled Enabled
Serial Data OK/Failed OK
1/4 Shift Active Yes/No No
Oil Temperature °C/°F Varies
Park/Neutral P-N/R-DL P-N
TCC 2nd On/Off, Yes/No Off, No
3rd,4th Yes/No, Yes/No No, No
Batt/Ign Volts Volts 13.5-14.2
PROM ID PROM # Internal ID Only (this is not the service part number)
Time From Start Minutes