Nissan March K13. Manual - part 221

SYSTEM

EC-345

< SYSTEM DESCRIPTION >

[HR12DE (TYPE 2)]

*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION

The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel
system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.
The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the
vapor is stored there when the engine is not operating or when refueling to the fuel tank.
The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the
engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the
engine operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is
proportionally regulated as the air flow increases.
EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating and
idling.

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed

EVAP canister
purge flow control

EVAP canister purge volume
control solenoid valve

Manifold absolute pressure (MAP) sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Heated oxygen sensor 1

Density of oxygen in exhaust gas
(Mixture ratio feedback signal)

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Battery

Battery voltage

Combination meter

Vehicle speed signal

PBIB3039E

EC-346

< SYSTEM DESCRIPTION >

[HR12DE (TYPE 2)]

DIAGNOSIS SYSTEM (ECM)

DIAGNOSIS SYSTEM (ECM)

Diagnosis Description

INFOID:0000000005886479

INTRODUCTION

The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actua-
tors. The ECM also records various emission-related diagnostic information including:

The above information can be checked using procedures listed in the table below.

: Applicable

—: Not applicable

*: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.

The malfunction indicator (MIL) on the instrument panel lights up when the same malfunction is detected in
two consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to

EC-363,

"Fail Safe"

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 memory. The MIL will not light up at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in
the ECM memory, and the MIL lights up. The MIL lights up at the same time when the DTC is stored. <2nd
trip> The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation.

DTC AND FREEZE FRAME DATA

DTC and 1st Trip DTC

The 1st trip DTC (whose number is the same as the DTC number) is displayed for the latest self-diagnostic
result obtained. If the ECM memory was cleared previously, and the 1st trip DTC did not recur, the 1st trip DTC
will not be displayed.
If a malfunction is detected during the 1st trip, the 1st trip DTC is stored in the ECM memory. The MIL will not
light up (two trip detection logic). If the same malfunction is not detected in the 2nd trip (meeting the required
driving pattern), the 1st trip DTC is cleared from the ECM memory. If the same malfunction is detected in the
2nd trip, both the 1st trip DTC and DTC are stored in the ECM memory and the MIL lights up. In other words,
the DTC is stored in the ECM memory and the MIL lights up when the same malfunction occurs in two consec-
utive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and 2nd
trips, only the 1st trip DTC will continue to be stored. For malfunctions that light up the MIL during the 1st trip,
the DTC and 1st trip DTC are stored in the ECM memory.
Procedures for clearing the DTC and the 1st trip DTC from the ECM memory are described in “How to Erase
DTC and 1st trip DTC” below.
When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame
data as specified in Work Flow procedure Step 2, refer to

EC-372, "Work Flow"

. Then perform DTC CONFIR-

MATION PROCEDURE or Component Function Check to try to duplicate the malfunction. If the malfunction is
duplicated, the item requires repair.

Freeze Frame Data and 1st Trip Freeze Frame Data

The ECM records the driving conditions such as fuel system status, engine coolant temperature, short term
fuel trim, long term fuel trim, engine speed, vehicle speed, absolute throttle position, base fuel schedule and
intake air temperature at the moment a malfunction is detected.

Emission-related diagnostic information

Diagnostic Trouble Code (DTC)

Freeze Frame data

1st Trip Diagnostic Trouble Code (1st Trip DTC)

1st Trip Freeze Frame data

DTC

1st trip DTC

Freeze Frame data

1st trip Freeze Frame data

CONSULT-III

ECM

—

DIAGNOSIS SYSTEM (ECM)

EC-347

< SYSTEM DESCRIPTION >

[HR12DE (TYPE 2)]

Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data.
The data, stored together with the DTC data, are called freeze frame data. The 1st trip freeze frame data and
the freeze frame data can only be displayed on the CONSULT-III screen.
Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the
ECM. There is no priority for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is
detected. However, once freeze frame data (2nd trip detection/MIL ON) is stored in the ECM memory, 1st trip
freeze frame data is no longer stored. Remember, only one set of freeze frame data can be stored in the ECM.
Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM mem-
ory is erased. Procedures for clearing the ECM memory are described in “How to Erase DTC and 1st trip DTC”
below.

How to Read DTC and 1st Trip DTC

With CONSULT-III

CONSULT-III displays the DTC in "SELF-DIAG RESULTS" mode.
Examples: P0117, P0340, P1217, etc.
These DTCs are prescribed by SAE J1979/ISO 15031-5.
(CONSULT-III also displays the malfunctioning component or system.)

Without CONSULT-III

The number of blinks of the MIL in the Diagnostic Test Mode II (Self-Diagnostic Results) indicates the DTC.
Example: 0117, 0340, 1217, etc.
These DTCs are controlled by NISSAN.
• 1st trip DTC No. is the same as DTC No.
• Output of a DTC indicates a malfunction. However, the Diagnostic Test Mode II do not indicate

whether the malfunction is still occurring or has occurred in the past and has returned to normal.
CONSULT-III can identify malfunction status as shown below. Therefore, using CONSULT-III (if avail-
able) is recommended.

DTC or 1st trip DTC of a malfunction is displayed in “Self diagnostic Result” mode of CONSULT-III.
Time data indicates how many times the vehicle was driven after the last detection of a DTC.
If the DTC is being detected currently, the time data will be [0].
If a 1st trip DTC is stored in the ECM, the time data will be [1t].

How to Erase DTC and 1st Trip DTC

With CONSULT-III

NOTE:
If the ignition switch stays ON after repair work, be sure to turn ignition OFF once. Wait at least 10 sec-
onds and then turn it ON (engine stopped) again.

Select “ENGINE” with CONSULT-III.

Select “SELF-DIAG RESULTS”.

Touch “ERASE”. (DTC in ECM will be erased.)

Without CONSULT-III

NOTE:
If the ignition switch stays ON after pair work, be sure to turn ignition OFF once. Wait at least 10 sec-
onds and then turn it ON (engine stopped) again.
1.

Erase DTC in ECM. Refer to “How to Erase Diagnostic Test Mode II (Self-diagnostic Results) below.

• If the battery is disconnected, the emission-related diagnostic information will be lost within 24

hours.

• The following data are cleared when the ECM memory is erased.
- Diagnostic trouble codes
- 1st trip diagnostic trouble codes
- Freeze frame data
- 1st trip freeze frame data
Actual work procedures are explained using a DTC as an example. Be careful so that not only the DTC, but all
of the data listed above, are cleared from the ECM memory during work procedures.

MALFUNCTION INDICATOR LAMP (MIL)

Description

EC-348

< SYSTEM DESCRIPTION >

[HR12DE (TYPE 2)]

DIAGNOSIS SYSTEM (ECM)

The MIL is located on the instrument panel.

The MIL will light up when the ignition switch is turned ON with-
out the engine running. This is a bulb check.
If the MIL does not light up, check MIL circuit. Refer to

EC-509,

"Component Function Check"

When the engine is started, the MIL should go off.
If the MIL remains on, the on board diagnostic system has
detected an engine system malfunction.

On Board Diagnostic System Function

The on board diagnostic system has the following four functions.

Diagnostic Test Mode I — Bulb Check

In this mode, the MIL on the instrument panel should stay ON. If it remains OFF, check MIL circuit. Refer to

EC-509, "Component Function Check"

Diagnostic Test Mode I — Malfunction Warning

This DTC number is clarified in Diagnostic Test Mode II (Self-diagnostic Results)

Diagnostic Test Mode II — Self-diagnostic Results

In this mode, the DTC and 1st trip DTC are indicated by the number of blinks of the MIL as shown below.

SAT652J

Diagnostic Test
Mode

KEY and ENG.
Status

Function

Explanation of Function

Mode I

Ignition switch in
ON position

Engine stopped

BULB CHECK

This function checks the MIL bulb for damage (blown, open
circuit, etc.).
If the MIL does not come on, check MIL circuit.

Engine running

MALFUNCTION
WARNING

This is a usual driving condition. When a malfunction is de-
tected twice in two consecutive driving cycles (two trip de-
tection logic), the MIL will light up to inform the driver that a
malfunction has been detected.
One trip detection diagnoses will light up the MIL in the 1st
trip.

Mode II

Ignition switch in
ON position

Engine stopped

SELF-DIAGNOSTIC
RESULTS

This function allows DTCs and 1st trip DTCs to be read.

Engine running

HEATED OXYGEN SENSOR 1
MONITOR

This function allows the fuel mixture condition (lean or rich),
monitored by heated oxygen sensor 1, to be read.

MIL

Condition

When the malfunction is detected.

OFF

No malfunction.

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