Qr20 NISSAN X-TRAIL 2001 Service Owner's Manual

EC-10
Injector ..................................................................752
Fuel Pump ............................................................752
QR20(WITH EURO-OBD)
INDEX FOR DTC .....................................................753
Alphabetical Index ................................................753
DTC No. Index ......................................................755
PRECAUTIONS .......................................................757
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ...............................................................757
On Board Diagnostic (OBD) System of Engine and
A/T ........................................................................757
Precaution ............................................................757
Wiring Diagrams and Trouble Diagnosis ..............760
PREPARATION .......................................................761
Special Service Tools ...........................................761
Commercial Service Tools ....................................761
ENGINE CONTROL SYSTEM ................................763
System Diagram ...................................................763
Vacuum Hose Drawing .........................................764
System Chart ........................................................765
Multiport Fuel Injection (MFI) System ...................765
Electronic Ignition (EI) System .............................768
Air Conditioning Cut Control .................................768
Fuel Cut Control (at No Load and High Engine
Speed) ..................................................................769
CAN Communication ............................................769
BASIC SERVICE PROCEDURE .............................771
Idle Speed and Ignition Timing Check ..................771
Accelerator Pedal Released Position Learning ....772
Throttle Valve Closed Position Learning ...............772
Idle Air Volume Learning ......................................772
Fuel Pressure Check ............................................775
ON BOARD DIAGNOSTIC (OBD) SYSTEM ..........777
Introduction ...........................................................777
Two Trip Detection Logic ......................................777
Emission-related Diagnostic Information ..............778
NATS (Nissan Anti-theft System) ..........................790
Malfunction Indicator (MI) .....................................790
OBD System Operation Chart ..............................793
TROUBLE DIAGNOSIS ..........................................799
Trouble Diagnosis Introduction .............................799
DTC Inspection Priority Chart ...............................802
Fail-safe Chart ......................................................803
Basic Inspection ...................................................805
Symptom Matrix Chart ..........................................809
Engine Control Component Parts Location ..........813
Circuit Diagram .....................................................817
ECM Harness Connector Terminal Layout ...........819
ECM Terminals and Reference Value ...................819
CONSULT-II Function ...........................................826
Generic Scan Tool (GST) Function .......................836
CONSULT-II Reference Value in Data Monitor .....838
Major Sensor Reference Graph in Data Monitor
Mode .....................................................................840
TROUBLE DIAGNOSIS - SPECIFICATION VALUE .843
Description ............................................................843Testing Condition ..................................................843
Inspection Procedure ........................................... .843
Diagnostic Procedure ............................................844
TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-
DENT .......................................................................847
Description ............................................................847
Diagnostic Procedure ............................................847
POWER SUPPLY CIRCUIT FOR ECM ...................848
Wiring Diagram .....................................................848
ECM Terminals and Reference Value ...................849
Diagnostic Procedure ............................................849
Component Inspection ..........................................853
DTC U1000 CAN COMMUNICATION LINE ............854
Description ............................................................854
On Board Diagnosis Logic ....................................854
DTC Confirmation Procedure ................................854
Wiring Diagram .....................................................855
Diagnostic Procedure ............................................856
DTC P0011 IVT CONTROL .....................................857
Description ............................................................857
CONSULT-II Reference Value in Data Monitor Mode
.857
ECM Terminals and Reference Value ...................857
On Board Diagnosis Logic ....................................858
DTC Confirmation Procedure ................................858
Diagnostic Procedure ............................................859
DTC P0031, P0032 HO2S1 HEATER ......................860
Description ............................................................860
CONSULT-II Reference Value in Data Monitor Mode
.860
ECM Terminals and Reference Value ...................860
On Board Diagnosis Logic ....................................861
DTC Confirmation Procedure ................................861
Wiring Diagram .....................................................862
Diagnostic Procedure ............................................863
Component Inspection ..........................................864
Removal and Installation .......................................864
DTC P0037, P0038 HO2S2 HEATER .....................
.865
Description ............................................................865
CONSULT-II Reference Value in Data Monitor Mode
.865
ECM Terminals and Reference Value ...................865
On Board Diagnosis Logic ....................................866
DTC Confirmation Procedure ................................866
Wiring Diagram .....................................................867
Diagnostic Procedure ............................................868
Component Inspection ..........................................869
Removal and Installation .......................................869
DTC P0102, P0103 MAF SENSOR .........................870
Component Description ........................................870
CONSULT-II Reference Value in Data Monitor Mode
.870
ECM Terminals and Reference Value ...................870
On Board Diagnosis Logic ....................................870
DTC Confirmation Procedure ................................871
Wiring Diagram .....................................................872
Diagnostic Procedure ............................................873
Component Inspection ..........................................874
Removal and Installation .......................................875

EC-14
Component Inspection .........................................1097
Removal and Installation .....................................1098
REFRIGERANT PRESSURE SENSOR .................1099
Component Description .......................................1099
ECM Terminals and Reference Value ..................1099
Wiring Diagram ....................................................11 0 0
Diagnostic Procedure ..........................................11 0 1
Removal and Installation .....................................11 0 2
ELECTRICAL LOAD SIGNAL ...............................110 3
CONSULT-II Reference Value in Data Monitor Mode
11 0 3
ECM Terminals and Reference Value ..................11 0 3
Wiring Diagram ....................................................11 0 4
Diagnostic Procedure ..........................................11 0 6
DATA LINK CONNECTOR .....................................1111
Wiring Diagram ....................................................1111
EVAPORATIVE EMISSION SYSTEM ....................111 2
Description ...........................................................111 2
Component Inspection .........................................111 4
POSITIVE CRANKCASE VENTILATION ..............111 5
Description ...........................................................111 5
Component Inspection .........................................111 5
SERVICE DATA AND SPECIFICATIONS (SDS) ...111 7
Fuel Pressure ......................................................111 7
Idle Speed and Ignition Timing ............................111 7
Calculated Load Value .........................................111 7
Mass Air Flow Sensor ..........................................111 7
Intake Air Temperature Sensor ............................111 7
Engine Coolant Temperature Sensor ..................111 7
Heated Oxygen Sensor 1 Heater ........................111 7
Heated Oxygen sensor 2 Heater .........................111 7
Crankshaft Position Sensor (POS) ......................111 7
Camshaft Position Sensor (PHASE) ...................111 7
Throttle Control Motor ..........................................111 8
Injector .................................................................111 8
Fuel Pump ...........................................................111 8
QR20(WITHOUT EURO-OBD)
INDEX FOR DTC ....................................................111 9
Alphabetical Index ...............................................111 9
DTC No. Index .....................................................11 2 0
PRECAUTIONS ......................................................112 1
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ..............................................................11 2 1
On Board Diagnostic (OBD) System of Engine and
A/T .......................................................................11 2 1
Precaution ...........................................................11 2 1
Wiring Diagrams and Trouble Diagnosis .............11 2 4
PREPARATION ......................................................112 5
Special Service Tools .......................................... 11 2 5
Commercial Service Tools ...................................11 2 5
ENGINE CONTROL SYSTEM ...............................112 7
System Diagram ..................................................11 2 7
Vacuum Hose Drawing ........................................11 2 8
System Chart .......................................................11 2 9
Multiport Fuel Injection (MFI) System ..................11 2 9
Electronic Ignition (EI) System ............................11 3 2Air Conditioning Cut Control ................................11 3 2
Fuel Cut Control (at No Load and High Engine
Speed) .................................................................11 3 3
CAN Communication ...........................................11 3 3
BASIC SERVICE PROCEDURE ............................11 35
Idle Speed and Ignition Timing Check .................11 3 5
Accelerator Pedal Released Position Learning ....11 3 6
Throttle Valve Closed Position Learning ..............11 3 6
Idle Air Volume Learning ......................................11 3 7
Fuel Pressure Check ...........................................11 3 9
ON BOARD DIAGNOSTIC (OBD) SYSTEM ..........11 41
Introduction ..........................................................11 4 1
Two Trip Detection Logic ......................................11 4 1
Emission-related Diagnostic Information .............11 4 1
NATS (Nissan Anti-theft System) .........................11 4 3
Malfunction Indicator (MI) ....................................11 4 4
TROUBLE DIAGNOSIS .........................................11 47
Trouble Diagnosis Introduction ............................11 4 7
DTC Inspection Priority Chart ..............................11 5 0
Fail-safe Chart .....................................................11 5 1
Basic Inspection ...................................................11 5 2
Symptom Matrix Chart .........................................11 5 6
Engine Control Component Parts Location ..........11 6 0
Circuit Diagram ....................................................11 6 4
ECM Harness Connector Terminal Layout ...........11 6 6
ECM Terminals and Reference Value ..................11 6 6
CONSULT-II Function ..........................................
11 7 3
CONSULT-II Reference Value in Data Monitor ....11 8 2
Major Sensor Reference Graph in Data Monitor
Mode ....................................................................11 8 5
TROUBLE DIAGNOSIS - SPECIFICATION VALUE 11 88
Description ...........................................................11 8 8
Testing Condition .................................................11 8 8
Inspection Procedure ........................................... 11 8 8
Diagnostic Procedure ........................................... 11 8 9
TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-
DENT ......................................................................11 92
Description ...........................................................11 9 2
Diagnostic Procedure ........................................... 11 9 2
POWER SUPPLY CIRCUIT FOR ECM ..................11 93
Wiring Diagram ....................................................11 9 3
ECM Terminals and Reference Value ..................11 9 4
Diagnostic Procedure ........................................... 11 9 4
Component Inspection .........................................11 9 8
DTC U1000 CAN COMMUNICATION LINE ...........11 99
Description ...........................................................11 9 9
On Board Diagnosis Logic ...................................11 9 9
DTC Confirmation Procedure ...............................11 9 9
Wiring Diagram ....................................................1200
Diagnostic Procedure ........................................... 1201
DTC P0102, P0103 MAF SENSOR ........................1202
Component Description .......................................1202
CONSULT-II Reference Value in Data Monitor Mode
1202
ECM Terminals and Reference Value ..................1202
On Board Diagnosis Logic ...................................1203
DTC Confirmation Procedure ...............................1203
Wiring Diagram ....................................................1205
Diagnostic Procedure ........................................... 1206

INDEX FOR DTC
EC-753
[QR20(WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
MA
EC
[QR20(WITH EURO-OBD)]INDEX FOR DTCPFP:00024
Alphabetical IndexEBS00MS0
Check if the vehicle is a model with Euro-OBD (E-OBD) system or not by the “Type approval number” on the
identification plate. Refer to GI-43, "
IDENTIFICATION PLATE" .
NOTE:
If DTC U1000 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000. Refer to
EC-854
.
×: Applicable –: Not applicable
Items
(CONSULT-II screen terms)DTC*
1
TripMI lighting
upReference page
CONSULT-II
GST*
2ECM*3
APP SEN/CIRCUIT P0121 0121 1×EC-893
A/T 1ST GR FNCTN P0731 0731 2×AT-131
A/T 2ND GR FNCTN P0732 0732 2×AT-137
A/T 3RD GR FNCTN P0733 0733 2×AT-143
A/T 4TH GR FNCTN P0734 0734 2×AT-149
ATF TEMP SEN/CIRC P0710 0710 2×AT- 11 6
BRAKE SW/CIRCUIT P1805 1805 2 –EC-1068
CAN COMM CIRCUIT*7U1000
1000*61×EC-854
CKP SEN/CIRCUIT P0335 0335 2×EC-956
CMP SEN/CIRCUIT P0340 0340 2×EC-962
CYL 1 MISFIRE P0301 0301 2×EC-946
CYL 2 MISFIRE P0302 0302 2×EC-946
CYL 3 MISFIRE P0303 0303 2×EC-946
CYL 4 MISFIRE P0304 0304 2×EC-946
ECM P0605 0605 1 or 2× or –EC-988
ECM BACK UP/CIRC P1065 1065 2×EC-995
ECT SEN/CIRCUIT P0117 0117 1×EC-881
ECT SEN/CIRCUIT P0118 0118 1×EC-881
ENG OVER TEMP P1217 1217 1×EC-1050
ENGINE SPEED SIG P0725 0725 2×AT-127
ETC ACTR P1121 1121 1 or 2×EC-1010
ETC FUNCTION/CIRC P1122 1122 1×EC-1012
ETC MOT RLY/CIRC P1123 1123 1 or 2× or –EC-1018
FUEL SYS-LEAN-B1 P0171 0171 2×EC-934
FUEL SYS-RICH-B1 P0172 0172 2×EC-940
HO2S1 (B1) P0132 0132 2×EC-899
HO2S1 (B1) P0133 0133 2×EC-905
HO2S1 (B1) P0134 0134 2×EC-914
HO2S1 (B1) P1143 1143 2×EC-1023
HO2S1 (B1) P1144 1144 2×EC-1029
HO2S1 HTR (B1) P0031 0031 2×EC-860
HO2S1 HTR (B1) P0032 0032 2×EC-860
HO2S2 (B1) P0138 0138 2×EC-921
HO2S2 (B1) P0139 0139 2×EC-927
HO2S2 (B1) P1146 1146 2×EC-1035

EC-754
[QR20(WITH EURO-OBD)]
INDEX FOR DTC
*1: 1st trip DTC No. is the same as DTC No.
*2: These numbers are prescribed by ISO 15031-5.
*3: In Diagnostic Test Mode II (Self-diagnostic results), these numbers are controlled by NISSAN.
*4: When engine is running.
*5: When the fail-safe operations for both self-diagnoses occur at the same time, the MI illuminates.
*6: The trouble shooting for this DTC needs CONSULT-II.
*7: Except for M/T models without ESP/TCS/ABS system.
*8: For M/T models with ESP/TCS/ABS system. HO2S2 (B1) P1147 1147 2×EC-1042
HO2S2 HTR (B1) P0037 0037 2×EC-865
HO2S2 HTR (B1) P0038 0038 2×EC-865
IAT SEN/CIRCUIT P0112 0112 2×EC-876
IAT SEN/CIRCUIT P0113 0113 2×EC-876
INT/V TIM CONT-B1 P0011 0011 2×EC-857
INT/V TIM V/CIR-B1 P1111 1111 2×EC-1005
KNOCK SEN/CIRC-B1 P0327 0327 2 –EC-951
KNOCK SEN/CIRC-B1 P0328 0328 2 –EC-951
L/PRESS SOL/CIRC P0745 0745 2×AT- 1 6 3
MAF SEN/CIRCUIT P0102 0102 1×EC-870
MAF SEN/CIRCUIT P0103 0103 1×EC-870
MAF SENSOR P1102 1102 1×EC-999
MIL/CIRC P0650 0650 2 –EC-991
MULTI CYL MISFIRE P0300 0300 2×EC-946
NATS MALFUNCTION P1610 - P1615 1610 - 1615 2 –EC-790
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.No DTC
Flashing*4–
Flashing*4EC-791
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.P0000 0000––—
O/R CLTCH SOL/CIRC P1760 1760 2×AT- 1 8 5
P-N POS SW/CIRCUIT P1706 1706 2×EC-1064
PNP SW/CIRC P0705 0705 2×AT- 11 0
PURG VOLUME CONT/V P0444 0444 2×EC-972
PURG VOLUME CONT/V P0445 0445 2×EC-972
PW ST P SEN/CIRC P0550 0550 2 –EC-983
SFT SOL A/CIRC P0750 0750 1×AT- 1 7 0
SFT SOL B/CIRC P0755 0755 1×AT- 1 7 5
TCC SOLENOID/CIRC P0740 0740 2×AT- 1 5 8
TCS/CIRC*8P1212 1212 2 –EC-1049
THRTL POS SEN/CIRC P0120 0120 1 or 2× or –EC-886
TP SEN/CIRC A/T P1705 1705 1×AT- 1 8 0
TW CATALYST SYS-B1 P0420 0420 2×EC-968
VEH SPD SEN/CIR AT P0720 0720 2×AT- 1 2 2
VEH SPEED SEN/CIRC P0500 0500 2×EC-978
Items
(CONSULT-II screen terms)DTC*
1
TripMI lighting
upReference page
CONSULT-II
GST*
2ECM*3

INDEX FOR DTC
EC-755
[QR20(WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
MA
EC
DTC No. IndexEBS00MS1
Check if the vehicle is a model with Euro-OBD (E-OBD) system or not by the “Type approval number” on the
identification plate. Refer to GI-43, "
IDENTIFICATION PLATE" .
NOTE:
If DTC U1000 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000. Refer to
EC-854
.
×: Applicable –: Not applicable
DTC*
1
Items
(CONSULT-II screen terms)TripMI lighting
upReference page
CONSULT-II
GST*
2ECM*3
No DTC Flashing*4NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.–
Flashing*4EC-791
U1000
1000*6CAN COMM CIRCUIT*7 1×EC-854
P0000 0000NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.––—
P0011 0011 INT/V TIM CONT-B1 2×EC-857
P0031 0031 HO2S1 HTR (B1) 2×EC-860
P0032 0032 HO2S1 HTR (B1) 2×EC-860
P0037 0037 HO2S2 HTR (B1) 2×EC-865
P0038 0038 HO2S2 HTR (B1) 2×EC-865
P0102 0102 MAF SEN/CIRCUIT 1×EC-870
P0103 0103 MAF SEN/CIRCUIT 1×EC-870
P0112 0112 IAT SEN/CIRCUIT 2×EC-876
P0113 0113 IAT SEN/CIRCUIT 2×EC-876
P0117 0117 ECT SEN/CIRCUIT 1×EC-881
P0118 0118 ECT SEN/CIRCUIT 1×EC-881
P0120 0120 THRTL POS SEN/CIRC 1 or 2× or –EC-886
P0121 0121 APP SEN/CIRCUIT 1×EC-893
P0132 0132 HO2S1 (B1) 2×EC-899
P0133 0133 HO2S1 (B1) 2×EC-905
P0134 0134 HO2S1 (B1) 2×EC-914
P0138 0138 HO2S2 (B1) 2×EC-921
P0139 0139 HO2S2 (B1) 2×EC-927
P0171 0171 FUEL SYS-LEAN-B1 2×EC-934
P0172 0172 FUEL SYS-RICH-B1 2×EC-940
P0300 0300 MULTI CYL MISFIRE 2×EC-946
P0301 0301 CYL 1 MISFIRE 2×EC-946
P0302 0302 CYL 2 MISFIRE 2×EC-946
P0303 0303 CYL 3 MISFIRE 2×EC-946
P0304 0304 CYL 4 MISFIRE 2×EC-946
P0327 0327 KNOCK SEN/CIRC-B1 2 –EC-951
P0328 0328 KNOCK SEN/CIRC-B1 2 –EC-951
P0335 0335 CKP SEN/CIRCUIT 2×EC-956
P0340 0340 CMP SEN/CIRCUIT 2×EC-962
P0420 0420 TW CATALYST SYS-B1 2×EC-968
P0444 0444 PURG VOLUME CONT/V 2×EC-972

EC-756
[QR20(WITH EURO-OBD)]
INDEX FOR DTC
*1: 1st trip DTC No. is the same as DTC No.
*2: These numbers are prescribed by ISO 15031-5.
*3: In Diagnostic Test Mode II (Self-diagnostic results), these numbers are controlled by NISSAN.
*4: When engine is running.
*5: When the fail-safe operations for both self-diagnoses occur at the same time, the MI illuminates.
*6: The trouble shooting for this DTC needs CONSULT-II.
*7: Except for M/T models without ESP/TCS/ABS system.
*8: For M/T models with ESP/TCS/ABS system. P0445 0445 PURG VOLUME CONT/V 2×EC-972
P0500 0500
VEH SPEED SEN/CIRC*52×EC-978
P0550 0550 PW ST P SEN/CIRC 2 –EC-983
P0605 0605 ECM 1 or 2× or –EC-988
P0650 0650 MIL/CIRC 2 –EC-991
P0705 0705 PNP SW/CIRC 2×AT- 11 0
P0710 0710 ATF TEMP SEN/CIRC 2×AT- 11 6
P0720 0720
VEH SPD SEN/CIR AT*52×AT-122
P0725 0725 ENGINE SPEED SIG 2×AT-127
P0731 0731 A/T 1ST GR FNCTN 2×AT-131
P0732 0732 A/T 2ND GR FNCTN 2×AT-137
P0733 0733 A/T 3RD GR FNCTN 2×AT-143
P0734 0734 A/T 4TH GR FNCTN 2×AT-149
P0740 0740 TCC SOLENOID/CIRC 2×AT-158
P0745 0745 L/PRESS SOL/CIRC 2×AT-163
P0750 0750 SFT SOL A/CIRC 1×AT-170
P0755 0755 SFT SOL B/CIRC 1×AT-175
P1065 1065 ECM BACK UP/CIRC 2×EC-995
P1102 1102 MAF SENSOR 1×EC-999
P 1111 1111 I N T / V T I M V / C I R - B 1 2×EC-1005
P1121 1121 ETC ACTR 1 or 2×EC-1010
P1122 1122 ETC FUNCTION/CIRC 1×EC-1012
P1123 1123 ETC MOT RLY/CIRC 1 or 2× or –EC-1018
P1143 1143 HO2S1 (B1) 2×EC-1023
P1144 1144 HO2S1 (B1) 2×EC-1029
P1146 1146 HO2S2 (B1) 2×EC-1035
P1147 1147 HO2S2 (B1) 2×EC-1042
P1212 1212 TCS/CIRC*8 2 –EC-1049
P1217 1217 ENG OVER TEMP 1×EC-1050
P1610 - P1615 1610 - 1615 NATS MALFUNCTION 2 –EC-790
P1705 1705 TP SEN/CIRC A/T 1×AT-180
P1706 1706 P-N POS SW/CIRCUIT 2×EC-1064
P1760 1760 O/R CLTCH SOL/CIRC 2×AT-185
P1805 1805 BRAKE SW/CIRCUIT 2 –EC-1068
DTC*1
Items
(CONSULT-II screen terms)TripMI lighting
upReference page
CONSULT-II
GST*
2ECM*3

PRECAUTIONS
EC-757
[QR20(WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
MA
EC
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EBS00NBR
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual.
WARNING:
●To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.
●Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
●Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harness connec-
tors.
On Board Diagnostic (OBD) System of Engine and A/TEBS00MS3
The ECM has an on board diagnostic system. It will light up the malfunction indicator (MI) to warn the driver of
a malfunction causing emission deterioration.
CAUTION:
●Be sure to turn the ignition switch OFF and disconnect the negative battery terminal before any
repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves,
etc. will cause the MI to light up.
●Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MI to light up due to the open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)
●Certain systems and components, especially those related to OBD, may use a new style slide-
locking type harness connector. For description and how to disconnect, refer to PG-68, "
HAR-
NESS CONNECTOR" .
●Be sure to route and secure the harnesses properly after work. The interference of the harness
with a bracket, etc. may cause the MI to light up due to the short circuit.
●Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MI to light up due to the malfunction of the fuel injection system, etc.
●Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM and
TCM (Transmission control module) before returning the vehicle to the customer.
PrecautionEBS00MS4
●Always use a 12 volt battery as power source.
●Do not attempt to disconnect battery cables while engine is
running.
●Before connecting or disconnecting the ECM harness con-
nector, turn ignition switch OFF and disconnect negative
battery terminal. Failure to do so may damage the ECM
because battery voltage is applied to ECM even if ignition
switch is turned off.
●Before removing parts, turn ignition switch OFF and then
disconnect battery ground cable.
SEF289H

EC-758
[QR20(WITH EURO-OBD)]
PRECAUTIONS
●Do not disassemble ECM.
●If a battery terminal is disconnected, the memory will return
to the ECM value.
The ECM will now start to self-control at its initial value.
Engine operation can vary slightly when the terminal is dis-
connected. However, this is not an indication of a malfunc-
tion. Do not replace parts because of a slight variation.
●When connecting ECM harness connector, fasten it
securely with a lever as far as it will go as shown at right.
●When connecting or disconnecting pin connectors into or
from ECM, take care not to damage pin terminals (bend or
break).
Make sure that there are not any bends or breaks on ECM
pin terminal, when connecting pin connectors.
●Securely connect ECM harness connectors.
A poor connection can cause an extremely high (surge)
voltage to develop in coil and condenser, thus resulting in
damage to ICs.
●Keep engine control system harness at least 10 cm (4 in)
away from adjacent harness, to prevent engine control sys-
tem malfunctions due to receiving external noise, degraded
operation of ICs, etc.
●Keep engine control system parts and harness dry.
●Before replacing ECM, perform “ECM Terminals and Refer-
ence Value” inspection and make sure ECM functions prop-
erly. Refer to EC-819
.
●Handle mass air flow sensor carefully to avoid damage.
●Do not disassemble mass air flow sensor.
●Do not clean mass air flow sensor with any type of deter-
gent.
●Do not disassemble electric throttle control actuator.
●Even a slight leak in the air intake system can cause seri-
ous incidents.
●Do not shock or jar the camshaft position sensor (PHASE),
crankshaft position sensor (POS).
SEF707Y
SEF908W
PBIB0090E
MEF040D

PRECAUTIONS
EC-759
[QR20(WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
MA
EC
●After performing each TROUBLE DIAGNOSIS, perform
“DTC Confirmation Procedure” or “Overall Function
Check”.
The DTC should not be displayed in the “DTC Confirmation
Procedure” if the repair is completed. The “Overall Func-
tion Check” should be a good result if the repair is com-
pleted.
●When measuring ECM signals with a circuit tester, never
allow the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor.
●Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM's
transistor. Use a ground other than ECM terminals, such as
the ground.
●Do not operate fuel pump when there is no fuel in lines.
●Tighten fuel hose clamps to the specified torque.
SAT652J
SEF348N
PBIB0513E

EC-760
[QR20(WITH EURO-OBD)]
PRECAUTIONS
●Do not depress accelerator pedal when starting.
●Immediately after starting, do not rev up engine unneces-
sarily.
●Do not rev up engine just prior to shutdown.
●When installing C.B. ham radio or a mobile phone, be sure
to observe the following as it may adversely affect elec-
tronic control systems depending on installation location.
–Keep the antenna as far as possible from the electronic
control units.
–Keep the antenna feeder line more than 20 cm (8 in) away
from the harness of electronic controls.
Do not let them run parallel for a long distance.
–Adjust the antenna and feeder line so that the standing-
wave radio can be kept smaller.
–Be sure to ground the radio to vehicle body.
Wiring Diagrams and Trouble DiagnosisEBS00MS5
When you read Wiring diagrams, refer to the following:
●GI-13, "How to Read Wiring Diagrams"
●PG-2, "POWER SUPPLY ROUTING" for power distribution circuit
When you perform trouble diagnosis, refer to the following:
●GI-10, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES"
●GI-23, "How to Perform Efficient Diagnosis for an Electrical Incident"
SEF709Y
SEF708Y