Nissan Murano Z50 (2003 year). Manual - part 89

TROUBLE DIAGNOSIS

EC-143

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FUEL PUMP RLY

●

For 1 second after turning ignition switch ON

●

Engine running or cranking

ON

●

Except above conditions

OFF

VENT CONT/V

●

Ignition switch: ON

OFF

THRTL RELAY

●

Ignition switch: ON

ON

COOLING FAN

●

Engine: After warming up, idle 
the engine

●

Air conditioner switch: OFF

Engine coolant temperature is 94

°

C 

(201

°

F) or less

OFF

Engine coolant temperature is 
between 95

°

C (203

°

F) and 99

°

C 

(210

°

F)

LOW

Engine coolant temperature is 100

°

C 

(212

°

F) or more

HI

HO2S1 HTR (B1)
HO2S1 HTR (B2)

●

Engine: After warming up

●

Engine speed: Below 3,600 rpm

ON

●

Engine speed: Above 3,600 rpm

OFF

HO2S2 HTR (B1)
HO2S2 HTR (B2)

●

Engine speed is below 3,600 rpm after the following conditions are met.

–

Engine: After warming up

–

Keeping the engine speed between 3,500 and 4,000 rpm for one minute 
and at idle for one minute under no load

ON

●

Engine speed: Above 3,600 rpm

OFF

I/P PULLY SPD

●

Vehicle speed: More than 20 km/h (12 MPH)

Almost the same speed as the 
tachometer indication

VEHICLE SPEED

●

Turn drive wheels and compare CONSULT-II value with the speedometer 
indication.

Almost the same speed as the 
speedometer indication

TRVL AFTER MIL

●

Ignition switch: ON

Vehicle has traveled after MIL has 
turned ON.

0 - 65,535 km
(0 - 40,723 mile)

O2SEN HTR DTY

●

Engine coolant temperature when engine started: More than 80

°

C (176

°

F)

●

Engine speed: Below 3,600 rpm

Approx. 50%

AC PRESS SEN

●

Ignition switch: ON (Engine stopped)

Approx. 0V

●

Engine: Idle

●

Air conditioner switch: ON

1.0 - 4.0V

VEH SPEED SE

●

Turn drive wheels and compare CONSULT-II value with the speedometer 
indication.

Almost the same speed as the 
speedometer indication

SET VHCL SPD

●

Engine: Running

ASCD: Operating.

The preset vehicle speed is 
displayed.

MAIN SW

●

Ignition switch: ON

CRUISE switch: Pressed

ON

CRUISE switch: Released

OFF

CANCEL SW

●

Ignition switch: ON

CANCEL switch: Pressed

ON

CANCEL switch: Released

OFF

RESUME/ACC SW

●

Ignition switch: ON

ACCEL/RES switch: Pressed

ON

ACCEL/RES switch: Released

OFF

SET SW

●

Ignition switch: ON

 COAST/SET switch: Pressed

ON

 COAST/SET switch: Released

OFF

BRAKE SW1

●

Ignition switch: ON

Brake pedal: Fully released

ON

Brake pedal: Slightly depressed

OFF

BRAKE SW2

●

Ignition switch: ON

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

MONITOR ITEM

CONDITION

SPECIFICATION

EC-144

TROUBLE DIAGNOSIS

Revision; 2004 April

2003 Murano

*: Accelerator pedal position sensor 2 signal and throttle position sensor 2 signal are converted by ECM internally. Thus, they differ from
ECM terminals voltage signal.

CRUISE LAMP

●

Ignition switch: ON

CRUISE switch pressed

ON

CRUISE switch released

OFF

SET LAMP

●

CRUISE switch: ON

●

When vehicle speed is between 
40 km/h (25 MPH) and 144 km/h 
(89 MPH)

COAST/SET switch pressed

ON

COAST/SET switch released

OFF

MONITOR ITEM

CONDITION

SPECIFICATION

TROUBLE DIAGNOSIS

EC-145

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Major Sensor Reference Graph in Data Monitor Mode

ABS004B4

The following are the major sensor reference graphs in “DATA MONITOR” mode.

CLSD THL POS, ACCEL SEN 1, THRTL SEN 1

Below is the data for “CLSD THL POS”, “ACCEL SEN 1” and “THRTL SEN 1” when depressing the accelera-
tor pedal with the ignition switch “ON” and with selector lever in “D” position.
The signal of “ACCEL SEN 1” and “THRTL SEN 1” should rise gradually without any intermittent drop or rise
after “CLSD THL POS” is changed from “ON” to “OFF”.

ENG SPEED, MAS A/F SE-B1, THRTL SEN 1, HO2S2 (B1), HO2S1 (B1), INJ PULSE-B1

Below is the data for “ENG SPEED”, “MAS A/F SE-B1”, “THRTL SEN 1”, “HO2S2 (B1)”, “HO2S1 (B1)” and
“INJ PULSE-B1” when revving engine quickly up to 4,800 rpm under no load after warming up engine suffi-
ciently.
Each value is for reference, the exact value may vary.

PBIB0198E

SEF241Y

EC-146

TROUBLE DIAGNOSIS

Revision; 2004 April

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PBIB0668E

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-147

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TROUBLE DIAGNOSIS - SPECIFICATION VALUE

PFP:00031

Description

ABS004B5

The specification (SP) value indicates the tolerance of the value that is displayed in “DATA MONITOR (SPEC)”
mode of CONSULT-II during normal operation of the Engine Control System. When the value in “DATA MONI-
TOR (SPEC)” mode is within the SP value, the Engine Control System is confirmed OK. When the value in
“DATA MONITOR (SPEC)” mode is NOT within the SP value, the Engine Control System may have one or
more malfunctions.
The SP value is used to detect malfunctions that may affect the Engine Control System, but will not light the
MIL.
The SP value will be displayed for the following three items:

●

B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board cor-
rection)

●

A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle)

●

MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)

Testing Condition

ABS004B6

●

Vehicle driven distance: More than 5,000 km (3,017 miles)

●

Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm

2

 , 14.25 - 15.12 psi)

●

Atmospheric temperature: 20 - 30

°

C (68 - 86

°

F)

●

Engine coolant temperature: 75 - 95

°

C (167 - 203

°

F)

●

Transmission: Warmed-up*

1

●

Electrical load: Not applied*

2

●

Engine speed: Idle

*1: After the engine is warmed up to normal operating temperature, drive vehicle until “FLUID TEMP SE” (CVT
fluid temperature sensor signal) indicates more than 60

°

C (140

°

F).

*2: Rear window defogger switch, air conditioner switch, lighting switch are “OFF”. Steering wheel is straight
ahead.

Inspection Procedure

ABS004B7

NOTE:
Perform “DATA MONITOR (SPEC)” mode in maximum scale display.

1.

Perform 

EC-99, "Basic Inspection"

 .

2.

Confirm that the testing conditions indicated above are met.

3.

Select “B/FUEL SCHDL”, “A/F ALPHA-B1”, “A/F ALPHA-B2”
and “MAS A/F SE-B1” in “DATA MONITOR (SPEC)” mode with
CONSULT-II.

4.

Make sure that monitor items are within the SP value.

5.

If NG, go to 

EC-148, "Diagnostic Procedure"

 .

SEF601Z

EC-148

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Revision; 2004 April

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Diagnostic Procedure

ABS004B8

SEF613ZD

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-149

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SEF768Z

EC-150

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Revision; 2004 April

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SEF615ZA

TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT

EC-151

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TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT

PFP:00006

Description

ABS004B9

Intermittent incidents (I/I) may occur. In many cases, the malfunction resolves itself (the part or circuit function
returns to normal without intervention). It is important to realize that the symptoms described in the customer's
complaint often do not recur on (1st trip) DTC visits. Realize also that the most frequent cause of I/I occur-
rences is poor electrical connections. Because of this, the conditions under which the incident occurred may
not be clear. Therefore, circuit checks made as part of the standard diagnostic procedure may not indicate the
specific malfunctioning area.

Common I/I Report Situations

Diagnostic Procedure

ABS004BA

1. 

INSPECTION START

Erase (1st trip) DTCs. Refer to 

EC-81, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMA-

TION"

  .

>> GO TO 2.

2. 

CHECK GROUND TERMINALS

Check ground terminals for corroding or loose connection.
Refer to 

GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident"

 , "CIRCUIT INSPECTION",

"Ground Inspection".

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace.

3. 

SEARCH FOR ELECTRICAL INCIDENT

Perform 

GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident"

 , "INCIDENT SIMULATION

TESTS".

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace.

4. 

CHECK CONNECTOR TERMINALS

Refer to 

GI-23, "How to Check Terminal"

 , "HOW TO PROBE CONNECTORS", “How to Check Enlarged Con-

tact Spring of Terminal”.

OK or NG

OK

>> INSPECTION END

NG

>> Repair or replace connector.

STEP in Work Flow

Situation

II

The CONSULT-II is used. The SELF-DIAG RESULTS screen shows time data other than “0” or “[1t]”.

III

The symptom described by the customer does not recur.

IV

(1st trip) DTC does not appear during the DTC Confirmation Procedure.

VI

The Diagnostic Procedure for PXXXX does not indicate the malfunctioning area.

EC-152

POWER SUPPLY CIRCUIT FOR ECM

Revision; 2004 April

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POWER SUPPLY CIRCUIT FOR ECM

PFP:24110

Wiring Diagram

ABS004BB

TBWA0341E

POWER SUPPLY CIRCUIT FOR ECM

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Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

109

R

Ignition switch

[Ignition switch “OFF”]

0V

[Ignition switch “ON”]

BATTERY VOLTAGE
(11 - 14V)

111

W/B

ECM relay
(Self shut-off)

[Engine is running]
[Ignition switch “OFF”]

●

For a few seconds after turning ignition 
switch “OFF”

0 - 1.5V

[Ignition switch “OFF”]

●

A few seconds passed after turning ignition 
switch “OFF”

BATTERY VOLTAGE
(11 - 14V)

119

120

R/B
R/B

Power supply for ECM

[Ignition switch “ON”]

BATTERY VOLTAGE
(11 - 14V)

EC-154

POWER SUPPLY CIRCUIT FOR ECM

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TBWA0342E

POWER SUPPLY CIRCUIT FOR ECM

EC-155

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Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

Diagnostic Procedure

ABS004BC

1. 

INSPECTION START

Start engine.
Is engine running?

Yes or No

Yes

>> GO TO 7.

No

>> GO TO 2.

2. 

CHECK ECM POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch “OFF” and then “ON”.

2.

Check voltage between ECM terminal 109 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuse block (J/B) connector M1

●

10A fuse

●

Harness for open or short between ECM and fuse

>> Repair harness or connectors.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

1

B

ECM ground

[Engine is running]

●

Idle speed

Engine ground

115
116

B
B

ECM ground

[Engine is running]

●

Idle speed

Engine ground

Voltage: Battery voltage

MBIB0015E

EC-156

POWER SUPPLY CIRCUIT FOR ECM

Revision; 2004 April

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4. 

CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I

1.

Turn ignition switch “OFF”.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminals 1, 115, 116 and ground.
Refer to Wiring Diagram.

4.

Also check harness for short to power.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5. 

DETECT MALFUNCTIONING PART

Check the following.

●

Joint connector-1

●

Harness connectors F102, M82

●

Harness for open or short between ECM and ground

>> Repair open circuit or short to power in harness or connectors.

6. 

CHECK ECM POWER SUPPLY CIRCUIT-II

1.

Reconnect ECM harness connector.

2.

Turn ignition switch “ON”.

3.

Check voltage between IPDM E/R terminal 35 and ground with
CONSULT-II or tester.

OK or NG

OK

>> Go to 

EC-596, "IGNITION SIGNAL"

 .

NG

>> GO TO 7.

7. 

CHECK ECM POWER SUPPLY CIRCUIT-III

1.

Turn ignition switch “ON” and then “OFF”.

2.

Check voltage between ECM terminals 119, 120 and ground
with CONSULT-II or tester.

OK or NG

OK

>> GO TO 16.

NG (Battery voltage does not exist.)>>GO TO 8.
NG (Battery voltage exists for more than a few seconds.)>>GO  TO

16.

Continuity should exist.

Voltage: Battery voltage

PBIB1396E

Voltage:

After turning ignition switch “OFF”, battery 
voltage will exist for a few seconds, then 
drop approximately 0V.

MBIB0016E

POWER SUPPLY CIRCUIT FOR ECM

EC-157

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8. 

CHECK ECM POWER SUPPLY CIRCUIT-V

1.

Turn ignition switch “OFF”.

2.

Check voltage between ECM terminal 111 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 11.

9. 

CHECK ECM POWER SUPPLY CIRCUIT-VI

1.

Disconnect ECM harness connector.

2.

Disconnect IPDM E/R harness connector E8.

3.

Check harness continuity between ECM terminals 119, 120 and IPDM E/R terminal 33.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 14.

NG

>> GO TO 10.

10. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness or connectors E110, M7

●

Harness for open or short between ECM and IPDM E/R

>> Repair open circuit or short to ground or short to power in harness or connectors.

11. 

CHECK ECM POWER SUPPLY CIRCUIT-VII

1.

Disconnect ECM harness connector.

2.

Disconnect IPDM E/R harness connector.

3.

Check harness continuity between ECM terminal 111 and IPDM E/R terminal 44.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 13.

NG

>> GO TO 12.

12. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness or connectors E109, M6

●

Harness for open or short between ECM and IPDM E/R

>> Repair open circuit or short to ground or short to power in harness or connectors.

Voltage: Battery voltage

PBIB1191E

Continuity should exist.

Continuity should exist.

EC-158

POWER SUPPLY CIRCUIT FOR ECM

Revision; 2004 April

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13. 

CHECK 15A FUSE

1.

Disconnect 15A fuse from IPDM E/R.

2.

Check 15A fuse.

OK or NG

OK

>> GO TO 16.

NG

>> Replace 15A fuse.

14. 

CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II

1.

Turn ignition switch “OFF”.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminals 1, 115, 116 and ground.
Refer to Wiring Diagram.

4.

Also check harness for short to power.

OK or NG

OK

>> GO TO 16.

NG

>> GO TO 15.

15. 

DETECT MALFUNCTIONING PART

Check the following.

●

Joint connector-1

●

Harness connectors F102, M82

●

Harness for open or short between ECM and ground

>> Repair open circuit or short to power in harness or connectors.

16. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

OK or NG

OK

>> Replace IPDM E/R.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

Continuity should exist.