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Nissan Pathfinder (2011 year). Manual - part 255

EC-94

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure

INFOID:0000000006243774

INSPECTION START

Start engine.

Is engine running?

Yes or No

Yes

>> GO TO 8.

>> GO TO 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-III or tester.

OK or NG

>> GO TO 4.

>> GO TO 3.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors M31, E152

• Fuse block (J/B) connector M4

• 10 A fuse (No.1)

• Harness for open or short between ECM and fuse

>> Repair harness or connectors.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten three ground screws on the body. Refer to

EC-97, "Ground Inspection"

OK or NG

>> GO TO 5.

>> Repair or replace ground connections.

CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I

1. Disconnect ECM harness connector.

2. Check harness continuity between ECM terminals 1, 115, 116 and ground.

Refer to Wiring Diagram.

Voltage: Battery voltage

MBIB0015E

BBIA0539E

Continuity should exist.

2011 Pathfinder

POWER SUPPLY AND GROUND CIRCUIT

EC-95

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

3. Also check harness for short to power.
OK or NG

>> GO TO 7.

>> GO TO 6.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors F32, E2

• Harness for open or short between ECM and ground

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

CHECK ECM POWER SUPPLY CIRCUIT-II

1. Reconnect ECM harness connector.

2. Turn ignition switch ON.

3. Check voltage between IPDM E/R connector E119 terminal 3

and ground with CONSULT-III or tester.

OK or NG

>> Go to

EC-407, "Diagnosis Procedure"

>> GO TO 8.

CHECK ECM POWER SUPPLY CIRCUIT-III

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON and then OFF.

3. Check voltage between ECM terminals 119, 120 and ground

with CONSULT-III or tester.

OK or NG

>> GO TO 13.

NG (Battery voltage does not exist.)>>GO TO 9.

NG (Battery voltage exists for more than a few seconds.)>>GO TO

11.

CHECK ECM POWER SUPPLY CIRCUIT-IV

Check voltage between ECM terminal 111 and ground with CON-

SULT-III or tester.

OK or NG

>> GO TO 10.

>> GO TO 11.

10.

CHECK ECM POWER SUPPLY CIRCUIT-V

1. Disconnect ECM harness connector.

2. Disconnect IPDM E/R harness connector E119.

Voltage: Battery voltage

PBIB2569E

Voltage:

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

PBIB1630E

Voltage: Battery voltage

PBIB1191E

2011 Pathfinder

EC-96

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

POWER SUPPLY AND GROUND CIRCUIT

3. Check harness continuity between ECM terminals 119, 120 and IPDM E/R terminal 4.

Refer to Wiring Diagram.

4. Also check harness for short to ground and short to power.
OK or NG

>> GO TO 16.

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

11.

CHECK ECM POWER SUPPLY CIRCUIT-VI

1. Disconnect ECM harness connector.

2. Disconnect IPDM E/R harness connector E119.

3. Check harness continuity between ECM terminal 111 and IPDM E/R terminal 7.

Refer to Wiring Diagram.

4. Also check harness for short to ground and short to power.
OK or NG

>> GO TO 12.

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

12.

CHECK 20A FUSE

1. Disconnect 20 A fuse (No.53) from IPDM E/R. For the fuse arrangement, refer to

PG-75, "IPDM E/R Ter-

minal Arrangement"

2. Check 20 A fuse.
OK or NG

>> GO TO 16.

>> Replace 20A fuse.

13.

CHECK GROUND CONNECTIONS

Loosen and retighten three ground screws on the body. Refer to

EC-97, "Ground Inspection"

OK or NG

>> GO TO 14.

>> Repair or replace ground connections.

14.

CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II

1. Check harness continuity between ECM terminals 1, 115, 116 and ground.

Refer to Wiring Diagram.

2. Also check harness for short to power.
OK or NG

>> GO TO 16.

>> GO TO 15.

15.

DETECT MALFUNCTIONING PART

Check the following.

Continuity should exist.

BBIA0539E

Continuity should exist.

2011 Pathfinder

POWER SUPPLY AND GROUND CIRCUIT

EC-97

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

• Harness connectors F32, E2

• 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

GI-37, "Intermittent Incident"

OK or NG

>> Replace IPDM E/R. Refer to

PCS-29, "Removal and Installation of IPDM E/R"

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

Ground Inspection

INFOID:0000000006243775

Ground connections are very important to the proper operation of electrical and electronic circuits. Ground

connections are often exposed to moisture, dirt and other corrosive elements. The corrosion (rust) can

become an unwanted resistance. This unwanted resistance can change the way a circuit works.

Electronically controlled circuits are very sensitive to proper grounding. A loose or corroded ground can drasti-

cally affect an electronically controlled circuit. A poor or corroded ground can easily affect the circuit. Even

when the ground connection looks clean, there can be a thin film of rust on the surface.

When inspecting a ground connection follow these rules:

• Remove the ground bolt or screw.

• Inspect all mating surfaces for tarnish, dirt, rust, etc.

• Clean as required to assure good contact.

• Reinstall bolt or screw securely.

• Inspect for “add-on” accessories which may be interfering with the ground circuit.

• If several wires are crimped into one ground eyelet terminal, check for proper crimps. Make sure all of the

wires are clean, securely fastened and providing a good ground path. If multiple wires are cased in one eye-

let make sure no ground wires have excess wire insulation.

For detailed ground distribution information, refer to

GI-33, "Work Flow"

PBIB1870E

2011 Pathfinder

EC-98

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

U0101 CAN COMM CIRCUIT

U0101 CAN COMM CIRCUIT

Description

INFOID:0000000006243776

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.

Each control unit transmits/receives data but selectively reads required data only.

On Board Diagnosis Logic

INFOID:0000000006243777

This self-diagnosis has the one trip detection logic.

DTC Confirmation Procedure

INFOID:0000000006243778

1. Turn ignition switch ON and wait at least 3 seconds.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to

EC-98, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000006243779

Go to

LAN-52, "CAN System Specification Chart"

DTC No.

Trouble diagnosis

name

DTC detecting condition

Possible cause

U0101
0101

Lost communication
with TCM

• When ECM is not transmitting or receiving

CAN communication signal of OBD (emission-
related diagnosis) with TCM for 2 seconds or
more.

• CAN communication line between TCM

and ECM

• CAN communication line is open or short-

2011 Pathfinder

U1001 CAN COMM CIRCUIT

EC-99

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

U1001 CAN COMM CIRCUIT

Description

INFOID:0000000006243780

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.

Each control unit transmits/receives data but selectively reads required data only.

On Board Diagnosis Logic

INFOID:0000000006243781

The MIL will not illuminate for this diagnosis.

DTC Confirmation Procedure

INFOID:0000000006243782

1. Turn ignition switch ON and wait at least 3 seconds.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to

EC-99, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000006243783

Go to

LAN-52, "CAN System Specification Chart"

DTC No.

Trouble diagnosis

name

DTC detecting condition

Possible cause

U1001
1001

CAN communication
line

• When ECM is not transmitting or receiving

CAN communication signal other than OBD
(emission-related diagnosis) for 2 seconds or
more.

• Harness or connectors

(CAN communication line is open or
shorted)

2011 Pathfinder

EC-100

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

P0011, P0021 IVT CONTROL

P0011, P0021 IVT CONTROL

On Board Diagnosis Logic

INFOID:0000000006243784

FAIL-SAFE MODE

When the malfunction is detected, the ECM enters fail-safe mode.

DTC Confirmation Procedure

INFOID:0000000006243785

CAUTION:

Always drive at a safe speed.

NOTE:

•

If DTC P0011 or P0021 is displayed with DTC P0075 or P0081, first perform trouble diagnosis for DTC

P0075 or P0081. Refer to

EC-110

• If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next step.

1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is between 10V and 16V at

idle.

WITH CONSULT-III

1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.
2. Start engine and warm it up to the normal operating temperature.
3. Maintain the following conditions for at least 6 consecutive seconds. Hold the accelerator pedal as steady

as possible.

4. Stop vehicle with engine running and let engine idle for 10 seconds.
5. Check 1st trip DTC.
6. If the 1st trip DTC is detected, go to

EC-101, "Diagnosis Procedure"

If the 1st trip DTC is not detected, go to next step.

7. Maintain the following conditions for at least 20 consecutive seconds.

DTC No.

Trouble diagnosis

name

Detecting condition

Possible cause

P0011
0011
(Bank 1)

Intake valve timing
control performance

There is a gap between angle of target and
phase-control angle degree.

• Crankshaft position sensor (POS)
• Camshaft position sensor (PHASE)
• Intake valve timing control solenoid valve
• Accumulation of debris to the signal pick-up

portion of the camshaft

• Timing chain installation
• Foreign matter caught in the oil groove for in-

take valve timing control

P0021
0021
(Bank 2)

Detected items

Engine operating condition in fail-safe mode

Intake valve timing control

The signal is not energized to the solenoid valve and the valve control does not function.

ENG SPEED

1,200 - 2,000 rpm

COOLAN TEMP/S

More than 60