OBD System Operation Chart: Notes

Relationship Between MIL, 1st Trip DTC, DTC, and Detectable Items

When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are stored in the ECM memory.
When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are stored in the ECM memory, and the MIL will illuminate.
The MIL will turn off after the vehicle is driven 3 times (driving pattern B) with no malfunction. A drive is counted only when the recorded driving pattern is met (as stored in the ECM). If another malfunction occurs while counting, the counter will reset.
The DTC and the freeze frame data will be stored until the vehicle is driven 40 times (driving pattern A) without the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and Fuel Injection System, the DTC and freeze frame data will be stored until the vehicle is driven 80 times (driving pattern C) without the same malfunction recurring. The "TIME" in "SELF-DIAGNOSTIC RESULTS" mode of CONSULT-III will count the number of times the vehicle is driven.
The 1st trip DTC is not displayed when the self-diagnosis results in OK for the 2nd trip.

Summary Chart

SUMMARY CHART

Items

Fuel Injection System

Misfire

Other

MIL (turns off)

3 (pattern B)

DTC, Freeze Frame Data (no display)

80 (pattern C)

40 (pattern A)

1st Trip DTC (clear)

1 (pattern C), ⁽¹⁾

1 (pattern B)

1st Trip Freeze Frame Data (clear)

⁽¹⁾, ⁽²⁾

1 (pattern B)

⁽¹⁾	Clear timing is at the moment OK is detected.

⁽²⁾	Clear timing is when the same malfunction is detected in the 2nd trip.

Relationship Between MIL, DTC, 1st Trip DTC and Driving Patterns for "Misfire < Exhaust Quality Deterioration >",

"Fuel Injection System"

Fig 1: Relationship Between MIL, DTC, 1st Trip DTC And Driving Patterns For Misfire - Fuel Injection System

Courtesy of NISSAN MOTOR CO., U.S.A.