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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 directs you to the next logical step in diagnosing a 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 a properly operating vehicle and are intended to represent a normal system 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 |
Data Value |
| A/C Clutch |
Off |
| A/C Request |
No |
| Base Pulse Width (BPW) |
.8-3.0 Milliseconds |
| Battery |
13.5-14.5 Volts |
| Block Learn Cell |
0 |
| Block Learn Enable |
No |
| Block Learn Memory (BLM) |
118-138 Counts |
| Coolant Temperature |
185-221°F (85-105°C) |
| Desired RPM |
ECM Idle Command |
| EGR Solenoid |
Off |
| EGR Temp. Signal |
0-5 Volts |
| Engine RPM |
| DOHC |
| Non-Turbo |
800-900 RPM |
| Turbo |
800-1000 RPM |
| SOHC |
| A/T |
890-990 RPM |
| M/T |
800-900 RPM |
| IAC |
1-50 Counts |
| Idle Throttle |
No |
| Integrator (INT) |
110-145 Counts |
| MAP |
.5-2.0 Volts |
| MAT Temperature |
50-194°F (10-90°C) |
| Open/Closed Loop |
Closed Loop (Open w/Extended Idle) |
| Oxygen Sensor |
.1-1.0 Millivolts |
| Park/Neutral Switch |
Park/Neutral |
| Power Steering Switch |
Normal |
| Shift Light (M/T) |
Off |
| Spark Advance |
Varies |
| Throttle Angle (%) |
0 |
| TPS |
.4-1.25 Volts |
| Vehicle Speed |
0 |