Nissan Murano Z50 (2003 year). Manual — part 83
ENGINE CONTROL SYSTEM
EC-47
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Revision; 2004 April
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Type 25 / Type26 / Type 27 / Type 28 / Type 29 / Type 30 / Type 31/type 32
SYSTEM DIAGRAM
●
Type25
●
Type26
●
Type27
SKIA4926E
SKIA4927E
SKIA4928E
EC-48
ENGINE CONTROL SYSTEM
Revision; 2004 April
2003 Murano
●
Type28
●
Type29
●
Type30
SKIA4929E
SKIA4930E
SKIA4931E
ENGINE CONTROL SYSTEM
EC-49
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Revision; 2004 April
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●
Type31
●
Type32
INPUT/OUTPUT SIGNAL CHART
T: Transmit R: Receive
SKIA4932E
SKIA4933E
Signals
ECM
TCM
Low
tire
pres-
sure
warn-
ing
con-
trol
unit
Dis-
play
unit
Dis-
play
con-
trol
unit
BCM
Uni-
fied
meter
and
A/C
amp.
Steer
ing
angle
sen-
sor
Drive
r seat
con-
trol
unit
AWD
con-
trol
unit
ABS
actu-
ator
and
elec-
tric
unit
(con-
trol
unit)
IPDM
E/R
Engine and CVT integrated control
signal
T
R
R
T
Second position signal
R
T
VDC operation signal
R
R
T
Stop lamp switch signal
R
T
R
Key switch signal
T
R
Ignition switch signal
T
R
R
P range signal
T
R
R
EC-50
ENGINE CONTROL SYSTEM
Revision; 2004 April
2003 Murano
Closed throttle position signal
T
R
Wide open throttle position signal
T
R
Second position indicator signal
T
R
R
Engine speed signal
T
R
R
R
R
R
R
Engine status signal
T
R
Engine coolant temperature signal
T
R
Accelerator pedal position signal
T
R
R
R
Fuel consumption monitor signal
T
R
CVT self-diagnosis signal
R
T
Input shaft revolution signal
R
T
R
Output shaft revolution signal
R
T
R
Air conditioner switch signal
R
T
A/C compressor request signal
T
R
A/C compressor feedback signal
T
R
T
Blower fan motor switch signal
R
T
A/C control signal
T
T
R
R
R
T
Cooling fan speed request signal
T
R
Position lights request signal
T
R
R
Low beam request signal
T
R
Low beam status signal
R
T
High beam request signal
T
R
R
High beam status signal
R
T
Front fog lights request signal
T
R
Vehicle speed signal
R
R
R
T
R
R
R
R
T
R
Sleep request 1 signal
T
R
Sleep request 2 signal
T
R
Door switch signal
R
T
R
R
T
R
R
R
Turn indicator signal
T
R
Key fob ID signal
T
R
Key fob door unlock signal
T
R
Seat belt buckle switch signal
R
T
Oil pressure switch signal
R
T
T
R
Buzzer output signal
T
R
Fuel level sensor signal
R
T
Signals
ECM
TCM
Low
tire
pres-
sure
warn-
ing
con-
trol
unit
Dis-
play
unit
Dis-
play
con-
trol
unit
BCM
Uni-
fied
meter
and
A/C
amp.
Steer
ing
angle
sen-
sor
Drive
r seat
con-
trol
unit
AWD
con-
trol
unit
ABS
actu-
ator
and
elec-
tric
unit
(con-
trol
unit)
IPDM
E/R
ENGINE CONTROL SYSTEM
EC-51
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Revision; 2004 April
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Fuel level low warning signal
R
R
T
Malfunction indicator signal
T
R
ASCD SET lamp signal
T
R
ASCD CRUISE lamp signal
T
R
Front wiper request signal
T
R
Front wiper stop position signal
R
T
Rear window defogger switch signal
T
R
Rear window defogger control signal
R
R
R
T
Hood switch signal
R
T
Theft warning horn request signal
T
R
Horn chirp signal
T
R
Steering angle sensor signal
T
R
Tire pressure signal
T
R
Tire pressure data signal
T
R
R
CVT position indicator signal
T
R
R
ABS warning lamp signal
R
T
VDC OFF indicator lamp signal
R
T
SLIP indicator lamp signal
R
T
Brake warning lamp signal
R
T
System setting signal
T
T
R
AWD warning lamp signal
R
T
AWD lock indicator lamp signal
R
T
AWD lock switch signal
T
R
Parking brake switch signal
R
T
R
Signals
ECM
TCM
Low
tire
pres-
sure
warn-
ing
con-
trol
unit
Dis-
play
unit
Dis-
play
con-
trol
unit
BCM
Uni-
fied
meter
and
A/C
amp.
Steer
ing
angle
sen-
sor
Drive
r seat
con-
trol
unit
AWD
con-
trol
unit
ABS
actu-
ator
and
elec-
tric
unit
(con-
trol
unit)
IPDM
E/R
EC-52
BASIC SERVICE PROCEDURE
Revision; 2004 April
2003 Murano
BASIC SERVICE PROCEDURE
PFP:00018
Idle Speed and Ignition Timing Check
ABS004AG
IDLE SPEED
With CONSULT-II
Check idle speed in “DATA MONITOR” mode with CONSULT-II.
With GST
Check idle speed with GST.
IGNITION TIMING
1.
Attach timing light to loop wire as shown.
2.
Check ignition timing.
SEF058Y
PBIB1374E
PBIB1382E
BASIC SERVICE PROCEDURE
EC-53
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Revision; 2004 April
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Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment
ABS004AH
PREPARATION
1.
Make sure that the following parts are in good order.
●
Battery
●
Ignition system
●
Engine oil and coolant levels
●
Fuses
●
ECM harness connector
●
Vacuum hoses
●
Air intake system
(Oil filler cap, oil level gauge, etc.)
●
Fuel pressure
●
Engine compression
●
Throttle valve
●
Evaporative emission system
2.
On air conditioner equipped models, checks should be carried out while the air conditioner is “OFF”.
3.
Checks should be carried out while shift lever is in “N” position.
4.
When measuring “CO” percentage, insert probe more than 40 cm (15.7 in) into tail pipe.
5.
Turn off headlamp, heater blower, rear window defogger.
6.
Keep front wheels pointed straight ahead.
EC-54
BASIC SERVICE PROCEDURE
Revision; 2004 April
2003 Murano
OVERALL INSPECTION SEQUENCE
PBIB1054E
BASIC SERVICE PROCEDURE
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INSPECTION PROCEDURE
1.
INSPECTION START
1.
Check service records for any recent repairs that may indicate a related malfunction, or a current need for
scheduled maintenance.
2.
Open engine hood and check the following:
–
Harness connectors for improper connections
–
Wiring harness for improper connections, pinches and cut
–
Vacuum hoses for splits, kinks and improper connections
–
Hoses and ducts for leaks
–
Air cleaner clogging
–
Gasket
3.
Confirm that electrical or mechanical loads are not applied.
–
Head lamp switch is OFF.
–
Air conditioner switch is OFF.
–
Rear window defogger switch is OFF.
–
Steering wheel is in the straight-ahead position, etc.
4.
Start engine and warm it up until engine coolant temperature
indicator points the middle of gauge.
Ensure engine stays below 1,000 rpm.
5.
Run engine at about 2,000 rpm for about 2 minutes under no-
load.
6.
Make sure that no DTC is displayed with CONSULT-II or GST.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding “Diagnostic Procedure”.
>> GO TO 3.
SEF983U
SEF976U
SEF977U
EC-56
BASIC SERVICE PROCEDURE
Revision; 2004 April
2003 Murano
3.
CHECK TARGET IDLE SPEED
With CONSULT-II
1.
Run engine at about 2,000 rpm for about 2 minutes under no-load.
2.
Rev engine (2,000 to 3,000 rpm) two or three times under no-
load, then run engine at idle speed for about 1 minute.
3.
Read idle speed in “DATA MONITOR” mode with CONSULT-II.
Without CONSULT-II
1.
Run engine at about 2,000 rpm for about 2 minutes under no-load.
2.
Rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed for about
1 minute.
3.
Check idle speed.
OK or NG
OK
>> GO TO 10.
NG
>> GO TO 4.
4.
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1.
Stop engine.
2.
Perform
EC-63, "Accelerator Pedal Released Position Learning"
.
>> GO TO 5.
5.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform
EC-64, "Throttle Valve Closed Position Learning"
>> GO TO 6.
SEF978U
CVT:
650
±
50 rpm (in "P" or "N" position)
SEF058Y
CVT:
650
±
50 rpm (in "P" or "N" position)
BASIC SERVICE PROCEDURE
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6.
PERFORM IDLE AIR VOLUME LEARNING
Perform
EC-64, "Idle Air Volume Learning"
.
Is Idle Air Volume Learning carried out successfully?
Yes or No
Yes
>> GO TO 7.
No
>> 1. Follow the instruction of “Idle Air Volume Learning”.
2. GO TO 4.
7.
CHECK TARGET IDLE SPEED AGAIN
With CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Read idle speed in “DATA MONITOR” mode with CONSULT-II.
Without CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Check idle speed.
OK or NG
OK
>> GO TO 10.
NG
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
●
Check camshaft position sensor (PHASE) and circuit. Refer to
.
●
Check crankshaft position sensor (POS) and circuit. Refer to
OK or NG
OK
>> GO TO 9.
NG
>> 1. Repair or replace.
2. GO TO 4.
9.
CHECK ECM FUNCTION
1.
Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but
this is the rarely the case.)
2.
Perform initialization of NVIS (NATS) system and registration of NVIS (NATS) ignition key IDs. Refer to
BL-189, "ECM Re-communicating Function"
.
>> GO TO 4.
10.
CHECK IGNITION TIMING
1.
Run engine at idle.
2.
Check ignition timing with a timing light.
OK or NG
OK (With CONSULT-II)>>GO TO 19.
OK (Without CONSULT-II)>>GO TO 20.
NG
>> GO TO 11.
CVT:
650
±
50 rpm (in "P" or "N" position)
CVT:
650
±
50 rpm (in "P" or "N" position)
CVT:
15
±
5
°
BTDC (in "P" or "N" position)
EC-58
BASIC SERVICE PROCEDURE
Revision; 2004 April
2003 Murano
11.
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1.
Stop engine.
2.
Perform
EC-63, "Accelerator Pedal Released Position Learning"
.
>> GO TO 12.
12.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform
EC-64, "Throttle Valve Closed Position Learning"
>> GO TO 13.
13.
PERFORM IDLE AIR VOLUME LEARNING
Perform
EC-64, "Idle Air Volume Learning"
Is Idle Air Volume Learning carried out successfully?
Yes or No
Yes
>> GO TO 14.
No
>> 1. Follow the instruction of “Idle Air Volume Learning”.
2. GO TO 4.
14.
CHECK TARGET IDLE SPEED AGAIN
With CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Read idle speed in “DATA MONITOR” mode with CONSULT-II.
Without CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Check idle speed.
OK or NG
OK
>> GO TO 15.
NG
>> GO TO 17.
15.
CHECK IGNITION TIMING AGAIN
1.
Run engine at idle.
2.
Check ignition timing with a timing light.
OK or NG
OK (With CONSULT-II)>>GO TO 19.
OK (Without CONSULT-II)>>GO TO 20.
NG
>> GO TO 16.
16.
CHECK TIMING CHAIN INSTALLATION
Check timing chain installation. Refer to
.
OK or NG
OK
>> GO TO 17.
NG
>> 1. Repair the timing chain installation.
2. GO TO 4.
CVT:
650
±
50 rpm (in "P" or "N" position)
CVT:
650
±
50 rpm (in "P" or "N" position)
CVT:
15
±
5
°
BTDC (in "P" or "N" position)
BASIC SERVICE PROCEDURE
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17.
DETECT MALFUNCTIONING PART
Check the following.
●
Check camshaft position sensor (PHASE) and circuit. Refer to
.
●
Check crankshaft position sensor (POS) and circuit. Refer to
OK or NG
OK
>> GO TO 18.
NG
>> 1. Repair or replace.
2. GO TO 4.
18.
CHECK ECM FUNCTION
1.
Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but
this is the rarely the case.)
2.
Perform initialization of NVIS (NATS) system and registration of NVIS (NATS) ignition key IDs. Refer to
BL-189, "ECM Re-communicating Function"
.
>> GO TO 4.
19.
CHECK HEATED OXYGEN SENSOR 1 (BANK 1) SIGNAL
With CONSULT-II
1.
Run engine at about 2,000 rpm for about 2 minutes under no-load.
2.
See “HO2S1 MNTR (B1)” in “DATA MONITOR” mode.
3.
Running engine at 2,000 rpm under no-load (The engine is
warmed up to normal operating temperature.), check that the
monitor fluctuates between LEAN and RICH more than 5 times
during 10 seconds.
OK or NG
OK
>> GO TO 21.
NG (Monitor does not fluctuate.)>>GO TO 23.
NG (Monitor fluctuates less than 5 times.)>>GO TO 31.
20.
CHECK HEATED OXYGEN SENSOR 1 (BANK 1) SIGNAL
Without CONSULT-II
1.
Stop engine and set ECM to Self-diagnostic mode II (Heated oxygen sensor 1 monitor). Refer to
"HOW TO SWITCH DIAGNOSTIC TEST MODE"
2.
Start engine and run it at about 2,000 rpm for about 2 minutes under no-load.
3.
Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.),
check that the MIL comes on more than 5 times during 10 seconds.
OK or NG
OK
>> GO TO 22.
NG (MIL does not come on)>>GO TO 23.
NG (MIL comes on less than 5 times)>>GO TO 31.
1 time:
RICH
→
LEAN
→
RICH
2 times:
RICH
→
LEAN
→
RICH
→
LEAN
→
RICH
PBIB0120E
EC-60
BASIC SERVICE PROCEDURE
Revision; 2004 April
2003 Murano
21.
CHECK HEATED OXYGEN SENSOR 1 (BANK 2) SIGNAL
With CONSULT-II
1.
See “HO2S1 MNTR (B2)” in “DATA MONITOR” mode.
2.
Running engine at 2,000 rpm under no-load (The engine is
warmed up to normal operating temperature.), check that the
monitor fluctuates between LEAN and RICH more than 5 times
during 10 seconds.
OK or NG
OK
>> INSPECTION END
NG (Monitor does not fluctuate.)>>GO TO 24.
NG (Monitor fluctuates less than 5 times.)>>GO TO 31.
22.
CHECK HEATED OXYGEN SENSOR 1 (BANK 2) SIGNAL
Without CONSULT-II
1.
Switch the monitored sensor from bank 1 to bank 2. Refer to
EC-85, "How to Switch Monitored Sensor
From Bank 1 to Bank 2 or Vice Versa"
2.
Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.),
check that the MIL comes on more than 5 times during 10 seconds.
OK or NG
OK
>> INSPECTION END
NG (MIL does not come on)>>GO TO 24.
NG (MIL comes on less than 5 times)>>GO TO 31.
23.
CHECK HEATED OXYGEN SENSOR 1 (BANK 1) HARNESS
1.
Turn ignition switch "OFF" and disconnect battery ground cable.
2.
Disconnect ECM harness connector.
3.
Disconnect heated oxygen sensor 1 (bank 1) harness connector.
4.
Check harness continuity between ECM terminal 35 and heated oxygen sensor 1 (bank 1) terminal 1.
Refer to Wiring Diagram,
.
5.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 25.
NG
>> 1. Repair or replace harness between ECM and heated oxygen sensor 1 (bank 1).
2. GO TO 4.
1 time:
RICH
→
LEAN
→
RICH
2 times:
RICH
→
LEAN
→
RICH
→
LEAN
→
RICH
PBIB0120E
Continuity should exist.
BASIC SERVICE PROCEDURE
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24.
CHECK HEATED OXYGEN SENSOR 1 (BANK 2) HARNESS
1.
Turn ignition switch "OFF" and disconnect battery ground cable.
2.
Disconnect ECM harness connector.
3.
Disconnect heated oxygen sensor 1 (bank 2) harness connector.
4.
Check harness continuity between ECM terminal 16 and heated oxygen sensor 1 (bank 2) terminal 1.
Refer to Wiring Diagram,
5.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 25.
NG
>> 1. Repair or replace harness between ECM and heated oxygen sensor 1 (bank 2).
2. GO TO 4.
25.
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1.
Reconnect ECM harness connector.
2.
Perform
EC-63, "Accelerator Pedal Released Position Learning"
>> GO TO 26.
26.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform
EC-64, "Throttle Valve Closed Position Learning"
>> GO TO 27.
27.
PERFORM IDLE AIR VOLUME LEARNING
Refer to
EC-64, "Idle Air Volume Learning"
.
Is Idle Air Volume Learning carried out successfully?
Yes or No
Yes (With CONSULT-II)>>GO TO 28.
Yes (Without CONSULT-II)>>GO TO 29.
No
>> 1. Follow the instruction of "Idle Air Volume Learning".
2. GO TO 4.
28.
CHECK "CO"%
With CONSULT-II
1.
Start engine and warm it up until engine coolant temperature indicator points the middle of gauge.
2.
Turn ignition switch "OFF", wait at least 10 seconds and then turn "ON".
3.
Select "ENG COOLANT TEMP" in "ACTIVE TEST" mode.
4.
Set "ENG COOLANT TEMP" to 5
°
C (41
°
F) by touching "DWN"
and "Qd".
5.
Start engine and rev it (2,000 to 3,000 rpm) two or three times
under no-load, then run engine at idle speed.
6.
Check "CO"%.
OK or NG
OK
>> GO TO 31.
NG
>> GO TO 30.
Continuity should exist.
Idle CO: 0.7
−
9.9% and engine runs smoothly.
SEF172Y
EC-62
BASIC SERVICE PROCEDURE
Revision; 2004 April
2003 Murano
29.
CHECK "CO"%
Without CONSULT-II
1.
Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
2.
Turn ignition switch "OFF".
3.
Disconnect engine coolant temperature sensor harness connector.
4.
Connect a resistor (4.4 k
Ω
) between terminals of engine coolant
temperature sensor harness connector.
5.
Start engine and rev it (2,000 to 3,000 rpm) two or three times
under no-load, then run engine at idle speed.
6.
Check "CO"%.
7.
After checking "CO"%, turn ignition switch "OFF", disconnect the
resistor from the terminals of engine coolant temperature sensor
harness connector, and then connect engine coolant tempera-
ture sensor harness connector to engine coolant temperature
sensor.
OK or NG
OK
>> GO TO 31.
NG
>> GO TO 30.
30.
RECONNECT HEATED OXYGEN SENSOR 1 HARNESS CONNECTOR
1.
Turn ignition switch "OFF".
2.
Reconnect heated oxygen sensor 1 harness connector.
>> GO TO 34.
31.
REPLACE HEATED OXYGEN SENSOR 1
1.
Stop engine.
2.
Replace heated oxygen sensor 1 on the malfunctioning bank.
With CONSULT-II>>GO TO 32.
Without CONSULT-II>>GO TO 33.
32.
CHECK HEATED OXYGEN SENSOR 1 (BANK 1)/(BANK 2) SIGNAL
With CONSULT-II
1.
Start engine and warm it up until engine coolant temperature indicator points the middle of gauge.
2.
See "HO2S1 MNTR (B1)/(B2)" in "DATA MONITOR" mode.
3.
Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.),
check that the monitor fluctuates between LEAN and RICH more than 5 times during 10 seconds.
OK or NG
OK >> GO
TO
4.
NG
>> GO TO 34.
Idle CO: 0.7
−
9.9% and engine runs smoothly.
SEF982UA
1 time:
RICH
→
LEAN
→
RICH
2 times:
RICH
→
LEAN
→
RICH
→
LEAN
→
RICH
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