Initiating Engine Basic Setting
- When ENGINE BASIC SETTING is initiated, ECU establishes the following conditions:
- Idle speed control is blocked
- Ignition timing is set at a constant 12 degrees
- EVAP control solenoid valve remains off, preventing purge
- A/C is turned off
- EGR control solenoid valve remains off, preventing EGR function
- ECU ignores dynamic signal from engine coolant temperature sensor and assumes a constant value of 176°F (80°C).
- Before initiating ENGINE BASIC SETTING:
- Ensure coolant temperature is at least 185°F (85°C)
- Turn off all electrical accessories
- Turn off A/C
- Shift transmission into Park or Neutral
- Disconnect PCV hoses from valve covers and plug hose ends.
- Retrieve and clear codes. See RETRIEVING CODES and CLEARING CODES . Start engine and let idle. Select function "04", INITIATE BASIC SETTING. Press HELP button for procedure on inputting group numbers. Enter "00", SYSTEM IN BASIC SETTING. Numbers representing display groups (channels) will appear.
- Compare displayed values with specified values. See DISPLAY GROUP VALUES (ECU "A") table. If displayed values are not as specified, see information following table for diagnosis.
DISPLAY GROUP VALUES (ECU "A")
| Display No. | Specified Value | Component/System |
|---|---|---|
| 1 | 135-160 | ECT Sensor |
| 2 | 150-165 | Mass Airflow Sensor |
| 3 | 28-32 | Engine Speed Sensor |
| 4 | 0-10 Or 240-255 | IAC Valve |
| 5 | 0-10 Or 240-255 | IAC Valve |
| 6 | 126-130 | IAC Valve |
| 7 | 20 | Shift Inputs |
| 8 | 120-136 | Oxygen Sensor |
| 9 | 65-90 | CO Adjusting |
| 10 | 50-99 | TP Sensor Learning |