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Nissan Sentra Service Manual: Diagnosis description : counter system

Nissan Sentra Service Manual / Engine / Engine control system / Operation / Diagnosis description : counter system

RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS

Counter system chart

For details about patterns B and C under “Fuel Injection System” and


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”.

Relationship Between MIL, DTC, 1st Trip DTC and Driving Patterns for “Misfire <Exhaust Quality Deterioration>”, “Fuel Injection System”


  1. When the same malfunction is detected in two consecutive trips, MIL will light up.
  2. MIL will turn OFF after vehicle is driven 3 times (pattern B) without any malfunctions.
  3. When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data will be stored in ECM.
  4. The DTC and the freeze frame data will not be displayed any longer after vehicle is driven 80 times (pattern C) without the same malfunction. (The DTC and the freeze frame data still remain in ECM.)
  5. When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data will be stored in ECM.
  6. The 1st trip DTC and the 1st trip freeze frame data will be cleared at the moment OK is detected.
  7. When the same malfunction is detected in the 2nd trip, the 1st trip freeze frame data will be cleared.
  8. 1st trip DTC will be cleared when vehicle is driven once (pattern C) without the same malfunction after DTC is stored in ECM.

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

Driving Pattern B

Refer to EC-60, "DIAGNOSIS DESCRIPTION : Driving Pattern".

Driving Pattern C

Refer to EC-60, "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”


  1. When the same malfunction is detected in two consecutive trips, MIL will light up.
  2. MIL will turn OFF after vehicle is driven 3 times (pattern B) without any malfunctions.
  3. When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data will be stored in ECM.
  4. The DTC and the freeze frame data will not be displayed any longer after vehicle is driven 40 times (pattern A) without the same malfunction.

    (The DTC and the freeze frame data still remain in ECM.)

  5. When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data will be stored in ECM.
  6. 1st trip DTC will be cleared after vehicle is driven once (pattern B) without the same malfunction.
  7. When the same malfunction is detected in the 2nd trip, the 1st trip freeze frame data will be cleared.

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

Driving Pattern A

Refer to EC-60, "DIAGNOSIS DESCRIPTION : Driving Pattern".

Driving Pattern B

Refer to EC-60, "DIAGNOSIS DESCRIPTION : Driving Pattern".

Diagnosis system (ECM)
Diagnosis description : 1st trip detection logic and two trip detection logic When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in the ECM ...

Diagnosis description : driving pattern
DRIVING PATTERN A Driving pattern A means a trip satisfying the following conditions. Engine speed reaches 400 rpm or more. Engine coolant temperature rises by 20В°C (36В°F) or more after s ...

Other materials:

Symptom diagnosis
Engine does not start when intelligent key is inside of vehicle Description Engine does not start when push-button ignition switch is pressed while carrying intelligent key. Note: Check that vehicle is under the condition shown in “conditions of vehicle” before starting diagnos ...

Headlamp
Aiming adjustment Preparation before adjusting Before performing aiming adjustment, check the following: Ensure all tires are inflated to correct pressure. Place vehicle and screen on level surface. Ensure there is no load in vehicle other than the driver (or equivalent weight placed in ...

Diagnosis description : permanent diagnostic trouble code (permanent DTC)
Permanent DTC is defined in SAE J1979/ISO 15031-5 Service $0A. ECM stores a DTC issuing a command of turning on MIL as a permanent DTC and keeps storing the DTC as a permanent DTC until ECM judges that there is no presence of malfunction. Permanent DTCs cannot be erased by using the erase f ...

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