Scan Tool Testing and Procedures

PURPOSE
The "Scan Data" listed may be used for comparison, after completing the diagnostic circuit check and finding the on-board diagnosis system functioning properly and no diagnostic trouble codes (DTC) were displayed.

The "Typical Values" are an average of display values recorded from normally operating vehicles and are intended to represent what a normally functioning system would display.

TEST EQUIPMENT:
Connect a "Scan-Tool" to the ALDL connector located under L.H. side of instrument panel. Only the parameters on this table are used for diagnosis. If a "Scan" tool reads other parameters, the values are not recommended by ISUZU for diagnostic use.


A "SCAN TOOL" that displays faulty or incorrect data should not be used and the problem should be reported to the manufacturer. The use of faulty equipment can result in mis-diagnosis and unnecessary repairs.

VEHICLE PRE-CONDITIONS:
- Engine idling
- At operating temperature (upper radiator hose hot)
- Closed throttle
- Park or Neutral
- Closed loop
- All accessories OFF

__________________________________________________________________________

"SCAN" POSITION UNITS DISPLAYED TYPICAL DATA VALUE
Coolant Temp. ° C / ° F 85-105 ° C (185-221 ° F)
Battery Voltage Volts 13.5-14.5
MAP Pressure kPa/Volts 29-48 kPa (1-2 volts)
depends on vac. & baro
Throttle Position Volts .48 ± .06 volts
O2 Sensor M/Volts .001-.999 and varying
Open/Closed Loop Open/Closed Closed Loop (will go open
at idle)
Rich/Lean Flag Rich/Lean Varies
O2 Cross Counts Counts Greater than 1
Engine Speed RPM 650 ± 100
Knock Signal No/Yes No
Fuel Integrator Counts Varies
Block Learn Counts 118-138
Idle Air Control Counts (steps) 1-50
Park/neutral P/N and RLD Park/Neutral (P/N)
MPH/KPH mph/kph 0
Torque Convertor Clutch Off/On Off (On with TCC
commanded)
A/C Clutch Off/On Off (ON with A/C
commanded)
PROM ID Varies Varies
__________________________________________________________________________