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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:

Removal and installation
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Control Units and Electrical Parts
PRECAUTIONS Never reverse polarity of battery terminals. Install only parts specified for a vehicle. Before replacing the control unit, check the input and output and functions of the component parts. Do not apply excessive force when disconnecting a connector. Do not apply exce ...

Precaution
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