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 do 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
Desired RPM RPM ECM Idle command (varies)
RPM RPM ± 50 rpm from desired RPM in drive
Coolant Temp. ° C 85-105 ° C
MAT Temp. ° C 10-90 ° C
MAP Pressure kPa/Volts 29-50 kPa (0.5-2 volts)
depends on vac. & Baro
BPW (Base pulse width) m/sec 0.8-3.0
O2 Sensor M/Volts 100-900 and varying
Battery Voltage Volts 13.5-14.5
Block Learn Enable Yes/No No
TPS Volts 0.4-1.25 volts
Throttle angle 0-100% 0
Idle Air Control Counts (steps) 1-50
Park/neutral P/N and RLD Park/Neutral (P/N)
INT (integrator) Counts 110-145
Block Learn Memory Counts 118-138
Open/Closed Loop Open/Closed Closed Loop (will go open
at idle)
Block Learn Cell O/I O
Vehicle Speed MPH 0
Spark Advance Degrees Varies
Battery Voltage Volts 13.5-14.5
EGR Solenoid On/Off Off
Time from Start 00:00 ??:??
A/C Request Yes/No No (A/C off)
A/C Clutch On/Off Off (A/C off)
P/S Switch Normal/Hi Pressure Normal
Shift Light (M/T) On/Off Off
EGR Temp Signal Volts 0-5