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Diagnostic Circuit Check

The Diagnostic Circuit Check will identify a problem created by an Electronic Engine Control System (EECS) malfunction. It is the starting point for diagnosis. This check will direct you to the next logical step in diagnosing the complaint.

After completing Diagnostic Circuit Check and finding on-board diagnostics functioning properly with no trouble codes displayed, use appropriate SCAN DATA table for comparison. 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 typically display.

NOTE: Only parameters supplied by manufacturer are used in this article. If a scan tester reads other parameters, values are not recommended by manufacturer for diagnostic use. A scan tester displaying faulty data should not be used or a misdiagnosis will occur. Report problem to scan tester manufacturer.
SCAN DATA

Scan Position (1) Data Value
A/C Off (On W/A/C Requested)
Battery 13.5-14.5 Volts
BLM (Block Learn Memory) 118-138 Counts
Coolant Temperature 185-221°F (85-105°C)
IAC 1-50 Counts
INT (Integrator) Varied Amount of Counts
Knock Signal No
MAP (2) 1-2 Volts
Open/Closed Loop Closed Loop (Open At Idle)
Oxygen Sensor (3) .1-.9 Volt
Oxygen Sensor Cross Counts Greater Than One
RPM 550-750 RPM
Rich/Lean Flag Varies
Torque Converter Clutch Off (On/W/TCC Requested)
TPS .42-.54 Volt
VSS 0 MPH
(1) With engine idling at normal operating temperature, transmission in Park or Neutral, system in closed loop and all accessories off.
(2) Voltage varies with vacuum and barometric pressure.
(3) Voltage varies with exhaust temperature.
Fig 1: Diagnostic Circuit Check Flow Chart
G50G02238Courtesy of ISUZU MOTOR CO.