2001 NISSAN X-TRAIL sensor

EC-44
[QR25(WITH EURO-OBD)]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
ON BOARD DIAGNOSTIC (OBD) SYSTEM
PFP:00028
IntroductionEBS00M0M
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
*1: 1st trip DTCs for self-diagnoses concerning SRT items cannot be shown on the GST display.
*2: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.
The malfunction indicator (MI) 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-20, "
INDEX
FOR DTC" .)
Two Trip Detection LogicEBS00M0N
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 MI 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 MI lights up. The MI 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. Specific on board diagnostic items will cause the ECM to light up or blink the MI, and store
DTC and Freeze Frame data, even in the 1st trip, as shown below.
×: Applicable —: Not applicable Emission-related diagnostic information ISO Standard
Diagnostic Trouble Code (DTC) Mode 3 of ISO 15031-5
Freeze Frame data Mode 2 of ISO 15031-5
System Readiness Test (SRT) code Mode 1 of ISO 15031-5
1st Trip Diagnostic Trouble Code (1st Trip DTC) Mode 7 of ISO 15031-5
1st Trip Freeze Frame data
Test values and Test limits Mode 6 of ISO 15031-5
Calibration ID Mode 9 of ISO 15031-5
DTC 1st trip DTCFreeze Frame
data1st trip Freeze
Frame dataSRT code Test value
CONSULT-II×× × × ×—
GST×
×*
1×—××
ECM×
×*
2————
ItemsMI DTC 1st trip DTC
1st trip 2nd trip
1st trip
displaying2nd trip
displaying1st trip
displaying2nd trip
display-
ing BlinkingLighting
upBlinkingLighting
up
Misfire (Possible three way cata-
lyst damage) — DTC: P0300 -
P0304 is being detected×———— —×—
Misfire (Possible three way cata-
lyst damage) — DTC: P0300 -
P0304 is being detected——×——×——
One trip detection diagnoses
(Refer to EC-20, "
INDEX FOR
DTC" )—×——×———
Except above — — —×—××—

ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-45
[QR25(WITH EURO-OBD)]
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Emission-related Diagnostic InformationEBS00M0O
EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS
×: Applicable —: Not applicable
DTC*
1
Items
(CONSULT-II screen terms)SRT codeTest value/
Test limit
(GST only)1st trip
DTC*1Reference page
CONSULT-II
GST*
2ECM*3
U1000
1000*6CAN COMM CIRCUIT*5——EC-122
P0000 0000NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.————
P0011 0011 INT/V TIM CONT-B1 — —×EC-125
P0031 0031 HO2S1 HTR (B1)××
×*4EC-128
P0032 0032 HO2S1 HTR (B1)××
×*4EC-128
P0037 0037 HO2S2 HTR (B1)××
×*4EC-133
P0038 0038 HO2S2 HTR (B1)××
×*4EC-133
P0102 0102 MAF SEN/CIRCUIT — — —EC-138
P0103 0103 MAF SEN/CIRCUIT — — —EC-138
P0112 0112 IAT SEN/CIRCUIT — —×EC-144
P0113 0113 IAT SEN/CIRCUIT — —×EC-144
P0117 0117 ECT SEN/CIRCUIT — — —EC-149
P0118 0118 ECT SEN/CIRCUIT — — —EC-149
P0122 0122 TP SEN 2/CIRC — — —EC-154
P0123 0123 TP SEN 2/CIRC — — —EC-154
P0127 0127 IAT SENSOR — —×EC-160
P0132 0132 HO2S1 (B1)××
×*4EC-163
P0133 0133 HO2S1 (B1)××
×*4EC-169
P0134 0134 HO2S1 (B1)××
×*4EC-178
P0138 0138 HO2S2 (B1)××
×*4EC-185
P0139 0139 HO2S2 (B1)××
×*4EC-192
P0171 0171 FUEL SYS-LEAN-B1 — —×EC-200
P0172 0172 FUEL SYS-RICH-B1 — —×EC-206
P0222 0222 TP SEN 1/CIRC — — —EC-212
P0223 0223 TP SEN 1/CIRC — — —EC-212
P0300 0300 MULTI CYL MISFIRE — —×EC-217
P0301 0301 CYL 1 MISFIRE — —×EC-217
P0302 0302 CYL 2 MISFIRE — —×EC-217
P0303 0303 CYL 3 MISFIRE — —×EC-217
P0304 0304 CYL 4 MISFIRE — —×EC-217
P0327 0327 KNOCK SEN/CIRC-B1 — —×EC-222
P0328 0328 KNOCK SEN/CIRC-B1 — —×EC-222
P0335 0335 CKP SEN/CIRCUIT — —×EC-227
P0340 0340 CMP SEN/CIRCUIT — —×EC-233
P0420 0420 TW CATALYST SYS-B1××
×*4EC-239
P0444 0444 PURG VOLUME CONT/V — —×EC-244
P0445 0445 PURG VOLUME CONT/V — —×EC-244

EC-46
[QR25(WITH EURO-OBD)]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
*1: 1st trip DTC No. is the same as DTC No.P0500 0500
VEH SPEED SEN/CIRC*
7——×EC-250
P0550 0550 PW ST P SEN/CIRC — —×EC-255
P0605 0605 ECM — —×EC-260
P0650 0650 MIL/CIRC — —×EC-263
P0705 0705 PNP SW/CIRC — —×AT- 11 0
P0710 0710 ATF TEMP SEN/CIRC — —×AT- 11 6
P0720 0720
VEH SPD SEN/CIR AT*7——×AT-122
P0731 0731 A/T 1ST GR FNCTN — —×AT-131
P0732 0732 A/T 2ND GR FNCTN — —×AT-137
P0733 0733 A/T 3RD GR FNCTN — —×AT-143
P0734 0734 A/T 4TH GR FNCTN — —×AT-149
P0740 0740 TCC SOLENOID/CIRC — —×AT-158
P0745 0745 L/PRESS SOL/CIRC — —×AT-163
P0750 0750 SFT SOL A/CIRC — — —AT- 1 7 0
P0755 0755 SFT SOL B/CIRC — — —AT- 1 7 5
P1065 1065 ECM BACK UP/CIRC — —×EC-267
P 1111 1111 I N T / V T I M V / C I R - B 1 — —×EC-271
P1121 1121 ETC ACTR — —×EC-276
P1122 1122 ETC FUNCTION/CIRC — —×EC-278
P1124 1124 ETC MOT PWR — — —EC-285
P1126 1126 ETC MOT PWR — — —EC-285
P1128 1128 ETC MOT — — —EC-290
P1143 1143 HO2S1 (B1) — —
×*4EC-295
P1144 1144 HO2S1 (B1) — —
×*4EC-301
P1146 1146 HO2S2 (B1) — —
×*4EC-307
P1147 1147 HO2S2 (B1) — —
×*4EC-315
P1217 1217 ENG OVER TEMP — — —EC-323
P1225 1225 CTP LEARNING — —×EC-337
P1226 1226 CTP LEARNING — —×EC-339
P1229 1229 SENSOR POWER/CIRC — — —EC-341
P1610 - P1615 1610 - 1615 NATS MALFUNCTION — —×EC-58
P1705 1705 TP SEN/CIRC A/T — — —AT- 1 8 0
P1706 1706 P-N POS SW/CIRCUIT — —×EC-345
P1760 1760 O/R CLTCH SOL/CIRC — —×AT-185
P1805 1805 BRAKE SW/CIRCUIT — —×EC-349
P2122 2122 APP SEN 1/CIRC — — —EC-355
P2123 2123 APP SEN 1/CIRC — — —EC-355
P2127 2127 APP SEN 2/CIRC — — —EC-361
P2128 2128 APP SEN 2/CIRC — — —EC-361
P2135 2135 TP SENSOR — — —EC-367
P2138 2138 APP SENSOR — — —EC-373
DTC*1
Items
(CONSULT-II screen terms)SRT codeTest value/
Te s t l i m i t
(GST only)1st trip
DTC*1Reference page
CONSULT-II
GST*
2ECM*3

EC-50
[QR25(WITH EURO-OBD)]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
SRT Item
The table below shows required self-diagnostic items to set the SRT to “CMPLT”.
*1: If completion of several SRTs is required, perform driving patterns (DTC confirmation procedure), one by one based on the priority for
models with CONSULT-II.
SRT Set Timing
SRT is set as “CMPLT” after self-diagnosis has been performed one or more times. Completion of SRT is
done regardless of whether the result is OK or NG. The set timing is different between OK and NG results and
is shown in the table below.
OK: Self-diagnosis is carried out and the result is OK.
NG: Self-diagnosis is carried out and the result is NG.
—: Self-diagnosis is not carried out.
When all SRT related self-diagnoses showed OK results in a single cycle (Ignition OFF-ON-OFF), the SRT will
indicate “CMPLT”. → Case 1 above
When all SRT related self-diagnoses showed OK results through several different cycles, the SRT will indicate
“CMPLT” at the time the respective self-diagnoses have at least one OK result. → Case 2 above
SRT item
(CONSULT-II
indication)Performance
Priority*1Required self-diagnostic items to set the SRT to “CMPLT” Corresponding DTC No.
CATALYST 2 Three way catalyst function P0420
HO2S 1 Heated oxygen sensor 1 P0132
Heated oxygen sensor 1 P0133
Heated oxygen sensor 1 P0134
Heated oxygen sensor 1 P1143
Heated oxygen sensor 1 P1144
Heated oxygen sensor 2 P0138
Heated oxygen sensor 2 P0139
Heated oxygen sensor 2 P1146
Heated oxygen sensor 2 P1147
HO2S HTR 1 Heated oxygen sensor 1 heater P0031, P0032
Heated oxygen sensor 2 heater P0037, P0038
Self-diagnosis resultExample
DiagnosisIgnition cycle
← ON → OFF ← ON → OFF ← ON → OFF ← ON →
All OK Case 1 P0400 OK (1) — (1) OK (2) — (2)
P0402 OK (1) — (1) — (1) OK (2)
P1402 OK (1) OK (2) — (2) — (2)
SRT of EGR “CMPLT” “CMPLT” “CMPLT” “CMPLT”
Case 2 P0400 OK (1) — (1) — (1) — (1)
P0402 — (0) — (0) OK (1) — (1)
P1402 OK (1) OK (2) — (2) — (2)
SRT of EGR “INCMP” “INCMP” “CMPLT” “CMPLT”
NG exists Case 3 P0400 OK OK — —
P0402 — — — —
P1402 NG — NGNG
(Consecutive
NG)
(1st trip)
DTC1st trip DTC — 1st trip DTCDTC
(= MI “ON”)
SRT of EGR “INCMP” “INCMP” “INCMP” “CMPLT”

EC-56
[QR25(WITH EURO-OBD)]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
×: Applicable —: Not applicable
HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION
How to Erase DTC ( With CONSULT-II)
The emission related diagnostic information in the ECM can be erased by selecting “ERASE” in the “SELF-
DIAG RESULTS” mode with CONSULT-II.
If DTCs are displayed for both ECM and TCM (Transmission control module), they need to be erased individu-
ally from the ECM and TCM (Transmission control module).
NOTE:
If the DTC is not for A/T related items (see EC-20
), skip steps 2 through 4.
1. If the ignition switch stays “ON” after repair work, be sure to turn ignition switch “OFF” once. Wait at least
10 seconds and then turn it “ON” (engine stopped) again.
2. Turn CONSULT-II “ON” and touch “A/T”.
3. Touch “SELF-DIAG RESULTS”.
4. Touch “ERASE”. [The DTC in the TCM (Transmission control module) will be erased.] Then touch “BACK”
twice.
5. Touch “ENGINE”.
6. Touch “SELF-DIAG RESULTS”.
SRT item Self-diagnostic test itemTest value (GST display)
Test limit Application
TID CID
CATALYST Three way catalyst function 01H 01H Max.×
HO2SHeated oxygen sensor 109H 04H Max.×
0AH 84H Min.×
0BH 04H Max.×
0CH 04H Max.×
0DH 04H Max.×
Heated oxygen sensor 219H 86H Min.×
1AH 86H Min.×
1BH 06H Max.×
1CH 06H Max.×
HO2S HTRHeated oxygen sensor 1 heater29H 08H Max.×
2AH 88H Min.×
Heated oxygen sensor 2 heater2DH 0AH Max.×
2EH 8AH Min.×

ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-59
[QR25(WITH EURO-OBD)]
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EC
MI Flashing without DTC
If the ECM is in Diagnostic Test Mode II, MI may flash when engine is running. In this case, check ECM diag-
nostic test mode. EC-59, "
HOW TO SWITCH DIAGNOSTIC TEST MODE" .
How to switch the diagnostic test (function) modes, and details of the above functions are described later, EC-
59 .
The following emission-related diagnostic information is cleared when the ECM memory is erased.
1. Diagnostic trouble codes
2. 1st trip diagnostic trouble codes
3. Freeze frame data
4. 1st trip freeze frame data
5. System readiness test (SRT) codes
6. Test values
7. Others
HOW TO SWITCH DIAGNOSTIC TEST MODE
NOTE:
●It is better to count the time accurately with a clock.
●It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit
has a malfunction.
●Always ECM returns to Diagnostic Test Mode I after ignition switch is turned “OFF”.
How to Set Diagnostic Test Mode II (Self-diagnostic Results)
1. Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.
2. Repeat the following procedure quickly five times within 5 seconds.
a. Fully depress the accelerator pedal.
b. Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the MI starts
blinking.
4. Fully release the accelerator pedal.
Mode II Ignition switch in
“ON” position
Engine stoppedSELF-DIAGNOSTIC
RESULTSThis function allows DTCs and 1st trip DTCs to be read.
Engine running HEATED OXYGEN SENSOR 1
MONITORThis function allows the fuel mixture condition (lean or
rich), monitored by heated oxygen sensor 1, to be read. Diagnostic Test
ModeKEY and ENG.
StatusFunction Explanation of Function

EC-60
[QR25(WITH EURO-OBD)]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
ECM has entered to Diagnostic Test Mode II (Self-diagnostic results).
How to Set Diagnostic Test Mode II (Heated Oxygen Sensor 1 Monitor)
1. Set the ECM in Diagnostic Test Mode II (Self-diagnostic results). Refer to EC-59, "How to Set Diagnostic
Test Mode II (Self-diagnostic Results)" .
2. Start Engine.
ECM has entered to Diagnostic Test Mode II (Heated oxygen sensor 1 monitor).
How to Erase Diagnostic Test Mode II (Self-diagnostic Results)
1. Set ECM in Diagnostic Test Mode II (Self-diagnostic results). Refer to EC-59, "How to Set Diagnostic Test
Mode II (Self-diagnostic Results)" .
2. Fully depress the accelerator pedal and keep it for more than 10 seconds.
The emission-related diagnostic information has been erased from the backup memory in the ECM.
3. Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.
DIAGNOSTIC TEST MODE I — BULB CHECK
In this mode, the MI on the instrument panel should stay ON. If it remains OFF, check the bulb. Refer to DI-43,
"WARNING LAMPS" or see EC-263 .
DIAGNOSTIC TEST MODE I — MALFUNCTION WARNING
●These DTC numbers are 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 MI as shown below.
The DTC and 1st trip DTC are displayed at the same time. If the MI does not illuminate in diagnostic test mode
I (Malfunction warning), all displayed items are 1st trip DTCs. If only one code is displayed when the MI illumi-
nates in diagnostic test mode II (SELF-DIAGNOSTIC RESULTS), it is a DTC; if two or more codes are dis-
played, they may be either DTCs or 1st trip DTCs. DTC No. is same as that of 1st trip DTC. These unidentified
PBIB0092E
MI Condition
ON When the malfunction is detected or the ECM's CPU is malfunctioning.
OFF No malfunction.

ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-61
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EC
codes can be identified by using the CONSULT-II or GST. A DTC will be used as an example for how to read a
code.
A particular trouble code can be identified by the number of four-digit numeral flashes. The “zero” is indicated
by the number of ten flashes. The length of time the 1,000th-digit numeral flashes on and off is 1.2 seconds
consisting of an ON (0.6-second) - OFF (0.6-second) cycle.
The 100th-digit numeral and lower digit numerals consist of a 0.3-second ON and 0.3-second OFF cycle.
A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later
numeral appears on the display 1.3 seconds after the former numeral has disappeared.
A change from one trouble code to another occurs at an interval of 1.8-second OFF.
In this way, all the detected malfunctions are classified by their DTC numbers. The DTC “0000” refers to no
malfunction. (See EC-20, "
INDEX FOR DTC" )
How to Erase Diagnostic Test Mode II (Self-diagnostic Results)
The DTC can be erased from the back up memory in the ECM by depressing accelerator pedal. Refer to EC-
59, "HOW TO SWITCH DIAGNOSTIC TEST MODE" .
●If the battery is disconnected, the DTC will be lost from the backup memory after approx 24 hours.
●Be careful not to erase the stored memory before starting trouble diagnoses.
DIAGNOSTIC TEST MODE II — HEATED OXYGEN SENSOR 1 MONITOR
In this mode, the MI displays the condition of the fuel mixture (lean or rich) which is monitored by the heated
oxygen sensor 1.
*: Maintains conditions just before switching to open loop.
To check the heated oxygen sensor 1 function, start engine in the Diagnostic Test Mode II and warm it up until
engine coolant temperature indicator points to the middle of the gauge.
Next run engine at about 2,000 rpm for about 2 minutes under no-load conditions. Then make sure that the MI
comes ON more than 5 times within 10 seconds with engine running at 2,000 rpm under no-load.
OBD System Operation ChartEBS00M0R
RELATIONSHIP BETWEEN MI, 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 MI will come on. For details, refer to EC-44, "
Two Trip Detection
Logic" .
SEF952W
MI Fuel mixture condition in the exhaust gas Air-fuel ratio feedback control condition
ON Lean
Closed loop system
OFF Rich
*Remains ON or OFF Any condition Open loop system