DIAGNOSIS DESCRIPTION: Counter System

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 come on.
The MIL will turn OFF after the vehicle is driven 3 times (driving pattern B) with no malfunction. The 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.

COUNTER SYSTEM 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)

For details about patterns B and C under "Fuel Injection System" and "Misfire", see Explanation For Driving Patterns For Misfire; Exhaust Quality Deterioration & Fuel Injection System.
For details about patterns A and B under Other, see Explanation For Driving Patterns For Misfire; Exhaust Quality Deterioration & Fuel Injection System..

⁽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 Diagram Between MIL, DTC, 1st Trip DTC And Driving Patterns (For Misfire)

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

Explanation for Driving Patterns for "Misfire < Exhaust Quality Deterioration >", "Fuel Injection System"

Driving Pattern B

Refer to "DIAGNOSIS DESCRIPTION: DRIVING PATTERN ".

Driving Pattern C

Refer to "DIAGNOSIS DESCRIPTION: DRIVING PATTERN ".

Example:

If the stored freeze frame data is as per the following:

Engine speed: 850 RPM, Calculated load value: 30%, Engine coolant temperature: 80°C (176°F)

To be satisfied with driving pattern C, the vehicle should run under the following conditions:

Engine speed: 475 - 1,225 RPM, Calculated load value: 27 - 33%, Engine coolant temperature: more than 70°C (158°F)

Relationship Between MIL, DTC, 1st Trip DTC and Driving Patterns Except For "Misfire < Exhaust Quality Deterioration >", "Fuel Injection System"

Fig 2: Relationship Diagram Between MIL, DTC, 1st Trip DTC And Driving Patterns (Except For Misfire)

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

Explanation for Driving Patterns Except for "Misfire < Exhaust Quality Deterioration >", "Fuel Injection System"

Driving Pattern A

Refer to "DIAGNOSIS DESCRIPTION: DRIVING PATTERN ".

Driving Pattern B

Refer to "DIAGNOSIS DESCRIPTION: DRIVING PATTERN ".