Nissan Terrano r20e. Manual — part 171
DTC and MI Detection Logic
When a malfunction is detected for the first time, the malfunction (DTC) is stored in the ECM memory.
The MI will light up each time the ECM detects a malfunction. However, if the same malfunction is experienced
in two consecutive driving patterns and the engine is still running, the MI will stay lit up. For a description of
diagnostic items causing the MI to light up, refer to “TROUBLE DIAGNOSIS — INDEX”, EC-293.
Diagnostic Trouble Code (DTC)
HOW TO READ DTC
The DTC can be read by the following methods.
Without CONSULT-II
ECM displays the DTC by a set of four digit numbers with MI illumination in the diagnostic test mode II (Self-
diagnostic results). Example: 0102, 0103, 0104, etc.
With CONSULT-II
CONSULT-II displays the DTC in “SELF-DIAG RESULTS” mode. Examples: P0100, P0115, P0500, etc.
These DTCs are prescribed by ISO15031-6.
(CONSULT-II also displays the malfunctioning component or system.)
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Output of the trouble code means that the indicated circuit has a malfunction. However, in the Mode
II it does not indicate whether the malfunction is still occurring or occurred in the past and returned
to normal.
CONSULT-II can identify them. Therefore, using CONSULT-II (if available) is recommended.
HOW TO ERASE DTC
How to Erase DTC (
With CONSULT-II)
1. If the ignition switch stays “ON” after repair work, be sure to turn ignition switch “OFF” once. Wait at least
5 seconds and then turn it “ON” (engine stopped) again.
2. Touch “ENGINE”.
3. Touch “SELF-DIAG RESULTS”.
4. Touch “ERASE”. (The DTC in the ECM will be erased.)
The emission related diagnostic information in the ECM can be erased by selecting “ERASE” in the “SELF-
DIAG RESULTS” mode with CONSULT-II.
SEF246Z
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
TD27Ti
EC-321
How to Erase DTC (
Without CONSULT-II)
1. If the ignition switch stays “ON” after repair work, be sure to turn ignition switch “OFF” once. Wait at least
5 seconds and then turn it “ON” (engine stopped) again.
2. Change the diagnostic test mode from Mode II to Mode I by using the data link connector. (See EC-323.)
The emission related diagnostic information in the ECM can be erased by changing the diagnostic test mode.
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If the battery is disconnected, the emission-related diagnostic information will be lost after approx.
24 hours.
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Erasing the emission-related diagnostic information using CONSULT-II is easier and quicker than
switching the diagnostic test mode using the data link connector.
Malfunction Indicator (MI)
1. The malfunction indicator will light up when the ignition switch
is turned ON without the engine running. This is a bulb check.
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If the malfunction indicator does not light up, refer to EL sec-
tion (“WARNING LAMPS/WIRING DIAGRAM”) or see MI &
DATA LINK CONNECTORS.
2. When the engine is started, the malfunction indicator should go
off.
If the lamp remains on, the on board diagnostic system has
detected an engine system malfunction.
If MI illuminates or flashes irregularly after starting engine,
water may have accumulated in fuel filter. Drain water from
fuel filter.
ON BOARD DIAGNOSTIC SYSTEM FUNCTION
The on board diagnostic system has the following three functions.
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 MI bulb for damage (blown, open
circuit, etc.).
If the MI does not come on, check MI circuit. (See EC-452.)
Engine running
MALFUNCTION
WARNING
This is a usual driving condition. When ECM detects a
malfunction, the MI will light up to inform the driver that a mal-
function has been detected.
Mode II
Ignition switch in
ON position
Engine stopped
SELF-DIAGNOSTIC
RESULTS
This function allows DTCs to be read.
SAT652J
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
TD27Ti
Diagnostic Trouble Code (DTC) (Cont’d)
EC-322
HOW TO SWITCH DIAGNOSTIC TEST MODES
*1: EC-452
*2: EC-322
*3: EC-452
SEF878Y
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
TD27Ti
Malfunction Indicator (MI) (Cont’d)
EC-323
DIAGNOSTIC TEST MODE I—BULB CHECK
In this mode, the MALFUNCTION INDICATOR on the instrument panel should stay ON. If it remains OFF,
check the bulb. Refer to EL section (“WARNING LAMPS/WIRING DIAGRAM”) or see EC-452.
DIAGNOSTIC TEST MODE I—MALFUNCTION WARNING
MI
Condition
ON
When a malfunction is detected or the ECM’s CPU is malfunctioning.
OFF
No malfunction.
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These Diagnostic Trouble Code Numbers are clarified in Diagnostic Test Mode II (SELF-DIAGNOSTIC
RESULTS).
DIAGNOSTIC TEST MODE II—SELF-DIAGNOSTIC RESULTS
In this mode, DTC is indicated by the number of blinks of the MI as shown below.
Long (0.6 second) blinking indicates the two LH digits of number and short (0.3 second) blinking indicates the
two RH digits of number. For example, the MI blinks 10 times for 6 seconds (0.6 sec x 10 times) and then it
blinks three times for about 1 second (0.3 sec x 3 times). This indicates the DTC “1003”.
In this way, all the detected malfunctions are classified by their DTC numbers. The DTC “0505” refers to no
malfunction. (See TROUBLE DIAGNOSIS — INDEX, EC-293.)
HOW TO ERASE DIAGNOSTIC TEST MODE II (Self-diagnostic results)
The diagnostic trouble code can be erased from the backup memory in the ECM when the diagnostic test mode
is changed from Diagnostic Test Mode II to Diagnostic Test Mode I repeating consecutively twice. (Refer to
“HOW TO SWITCH DIAGNOSTIC TEST MODES” on previous page.)
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If the battery terminal is disconnected, the diagnostic trouble code will be lost from the backup
memory within 24 hours.
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Be careful not to erase the stored memory before starting trouble diagnoses.
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If the MI flashes or “NATS MALFUNCTION” is displayed on “SELF-DIAG RESULTS” screen, perform
self-diagnostic results mode with CONSULT-II using NATS program card (NATS-E940). Refer to EL
section.
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Confirm no self-diagnostic results of NATS is displayed before touching “ERASE” in “SELF-DIAG
RESULTS” mode with CONSULT-II.
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When replacing ECM, initialisation of NATS system and registration of all NATS ignition key IDs
must be carried out with CONSULT-II using NATS program card (NATS-E940).
Therefore, be sure to receive all keys from vehicle owner.
SEF298QA
SEF162PB
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
TD27Ti
Malfunction Indicator (MI) (Cont’d)
EC-324
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