Mode II (Self-Diagnostic Results)

ON-BOARD DIAGNOSTIC SYSTEM - DIAGNOSTIC TEST MODE II (SELF DIAGNOSTIC RESULTS)

Diagnostic Trouble Code Output Example:

DESCRIPTION
In this mode, a diagnostic trouble code is indicated by the number of flashes from the RED LED or the MALFUNCTION INDICATOR LAMP as shown:

Long (0.6 second) blinking indicates the number of ten digits and short (0.3 second) blinking indicates the number of single digits.

Diagnostic Trouble Code Chart:

For example, the red LED flashes once for 0.6 seconds and then it flashes twice for 0.3 seconds. This indicates the number "12" and refers to a malfunction in the mass air flow sensor. In this way, all the problems are classified by their diagnostic trouble code numbers.

The diagnostic results will remain in Engine Control Module (ECM) memory.

Data Link Connector For Consult:

HOW TO ERASE DIAGNOSTIC TEST MODE II (SELF-DIAGNOSTIC RESULTS)
The diagnostic trouble code is erased from the backup memory on the ECM when the diagnostic test mode is changed from Diagnostic Test Mode II to Diagnostic Test Mode I. (Refer to "HOW TO SWITCH DIAGNOSTIC TEST MODES".)

^ When the battery terminal is disconnected, the diagnostic trouble code will be lost from the backup memory within 24 hours.

^ Do not erase the stored memory before beginning on-board diagnostic system.

ON-BOARD DIAGNOSTIC SYSTEM - DIAGNOSTIC TEST MODE II (HEATED OXYGEN SENSOR MONITOR)





DESCRIPTION
In this mode, the MALFUNCTION INDICATOR LAMP and RED LED display the condition of the fuel mixture (lean or rich) which is monitored by the heated oxygen sensor.

HOW TO CHECK HEATED OXYGEN SENSOR
1. Set Diagnostic Test Mode II.
2. Start engine and warm it up until engine coolant temperature indicator points to the middle of the gauge.

3. Run engine at about 2,000 rpm for about 2 minutes under no-load conditions.

4. Make sure RED LED or MALFUNCTION INDICATOR LAMP goes ON and OFF more than 5 times every 10 seconds; measured at 2,000 rpm under no-load.