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Nissan Maxima. Manual - part 889

PCS-36

< BASIC INSPECTION >

[POWER DISTRIBUTION SYSTEM]

DIAGNOSIS AND REPAIR WORKFLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

INFOID:0000000010049497

OVERALL SEQUENCE

DETAILED FLOW

JMKIA3449GB

PCS

DIAGNOSIS AND REPAIR WORKFLOW

PCS-37

< BASIC INSPECTION >

[POWER DISTRIBUTION SYSTEM]

GET INFORMATION FOR SYMPTOM

Get the detailed information from the customer about the symptom (the condition and the environment when

the incident/malfunction occurred).

>> GO TO 2

CHECK DTC

1. Check DTC for BCM and IPDM E/R.

2. Perform the following procedure if DTC is displayed.

Record DTC and freeze frame data (Print them out with CONSULT.)

Erase DTC.

Study the relationship between the cause detected by DTC and the symptom described by the customer.

3. Check related service bulletins for information.
Is any symptom described and any DTC detected?

Symptom is described, DTC is displayed>>GO TO 3

Symptom is described, DTC is not displayed>>GO TO 4

Symptom is not described, DTC is displayed>>GO TO 5

CONFIRM THE SYMPTOM

Confirm the symptom described by the customer.

Connect CONSULT to the vehicle in “DATA MONITOR” mode and check real time diagnosis results.

Verify relation ship between the symptom and the condition when the symptom is detected.

>> GO TO 5

CONFIRM THE SYMPTOM

Confirm the symptom described by the customer.

Connect CONSULT to the vehicle in “DATA MONITOR ” mode and check real time diagnosis results.

Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 6

PERFORM DTC CONFIRMATION PROCEDURE

Perform DTC Confirmation Procedure for the displayed DTC, and then check that DTC is detected again.

At this time, always connect CONSULT to the vehicle, and check diagnostic results in real time.

If two or more BCM DTCs are detected, refer to

BCS-63, "DTC Inspection Priority Chart"

and determine trou-

ble diagnosis order.

NOTE:

• Freeze frame data is useful if the DTC is not detected.

• Perform Component Function Check if DTC Confirmation Procedure is not included in Service Manual. This

simplified check procedure is an effective alternative though DTC cannot be detected during this check.

If the result of Component Function Check is NG, it is the same as the detection of DTC by DTC Confirma-

tion Procedure.

Is DTC detected?

YES

>> GO TO 7

>> Refer to

GI-41, "Intermittent Incident"

DETECT MALFUNCTIONING SYSTEM BY SYMPTOM DIAGNOSIS

Detect malfunctioning system according to symptom diagnosis based on the confirmed symptom in step 4,

and determine the trouble diagnosis order based on possible causes and symptom.

>> GO TO 7

DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE

Inspect according to Diagnostic Procedure of the system.

NOTE:

PCS-38

< BASIC INSPECTION >

[POWER DISTRIBUTION SYSTEM]

DIAGNOSIS AND REPAIR WORKFLOW

The Diagnostic Procedure described based on open circuit inspection. A short circuit inspection is also

required for the circuit check in the Diagnostic Procedure.
Is malfunctioning part detected?

YES

>> GO TO 8

>> Check voltage of related BCM and IPDM E/R terminals using CONSULT.

REPAIR OR REPLACE THE MALFUNCTIONING PART

1. Repair or replace the malfunctioning part.

2. Reconnect parts or connectors disconnected during Diagnostic Procedure again after repair and replace-

ment.

3. Check DTC. If DTC is displayed, erase it.

>> GO TO 9

FINAL CHECK

When DTC was detected in step 2, perform DTC Confirmation Procedure or Component Function Check

again, and then check that the malfunction have been fully repaired.

When symptom was described from the customer, refer to confirmed symptom in step 3 or 4 and check that

the symptom is not detected.
Is the inspection result normal?

YES

>> Inspection End.

NO (DTC is detected)>>GO TO 7

NO (Symptom remains)>>GO TO 6

Pre-Inspection for Multi-System Diagnostic

INFOID:0000000010049498

The engine start function, door lock function, power distribution system and NATS-IVIS/NVIS are closely

related to each other. Narrow down the system in question by performing this inspection to identify which sys-

tem is malfunctioning. For example, the vehicle security system can operate only when the door lock and

power distribution system are operating normally.

CHECK DOOR LOCK OPERATION

Check the door lock for normal operation with the Intelligent Key and door request switch.

Successful door lock operation with the Intelligent Key and request switch indicates that the remote keyless

entry receiver and inside key antenna required for engine start are functioning normally.
Can the door be locked with the Intelligent Key and door request switch?

YES

>> GO TO 2.

>> Refer to

DLK-183, "Symptom Table"

CHECK ENGINE STARTING

Check that the engine starts when the Intelligent Key is inserted into the key slot.
Does the engine start?

YES

>> GO TO 3.

>> Refer to

SEC-158, "Symptom Table"

CHECK POWER SUPPLY INDICATOR SWITCHING

Press push-button ignition switch and check that the position indicator switches from LOCK, through ACC to

ON.
Is each position indicator illuminating?

YES

>> GO TO 4.

>> Refer to

PCS-65, "Component Function Check"

CHECK VEHICLE SECURITY SYSTEM

Check the vehicle security system for normal operation. Refer to

SEC-7, "Vehicle Security Operation Check"

Are the inspection results normal?

YES

>> Inspection End.

>> Repair vehicle security system as necessary.

PCS

POWER DISTRIBUTION SYSTEM

PCS-39

< SYSTEM DESCRIPTION >

[POWER DISTRIBUTION SYSTEM]

SYSTEM DESCRIPTION

POWER DISTRIBUTION SYSTEM

System Description

INFOID:0000000009467120

INPUT/OUTPUT SIGNAL CHART

SYSTEM DESCRIPTION

• POWER DISTRIBUTION SYSTEM (PDS) is the system that BCM controls with the operation of the push-

button ignition switch and performs the power distribution to each power circuit. This system is used instead

of the mechanical power supply changing mechanism with the operation of the conventional key cylinder.

• The push-button ignition switch can be operated when Intelligent Key is in the following conditions. Refer to

Engine Start Function for details.

- Intelligent Key is in the detection area of the interior antenna

- Insert Intelligent Key in to the key slot

• The push-button ignition switch operation is input to BCM as a signal. BCM changes the power supply posi-

tion according to the status and operates the following relays to supply power to each power circuit.

- Ignition relay-1 (inside IPDM E/R)

- Ignition relay-2 (inside fuse block (J/B))

- ACC relay (inside fuse block (J/B))

- Front blower motor relay

NOTE:

The engine switch operation changes due to the conditions of brake pedal, CVT selector lever and vehicle

speed.

• The power supply position can be confirmed with the lighting of the indicators near the push-button ignition

switch.

PUSH-BUTTON IGNITION SWITCH OPERATION PROCEDURE

The power supply position changing operation can be performed with the following operation.

NOTE:

• When an Intelligent Key is within the detection area of inside key antenna and when it is inserted in to the

key slot, it is equivalent to the operations below.

• When starting the engine, the BCM monitors under the engine start conditions,

- Brake pedal operating condition

- CVT selector lever position

- Vehicle speed

• Unless each start condition is fulfilled, the engine will not respond regardless of how many times the engine

switch is pressed. At that time, illumination repeats the position in the order of LOCK

→ACC→ON→OFF.

Switch

Input Signal to BCM

BCM system

Actuator

Push-button ignition switch

Push switch

Power distribution system

• Ignition relay-1 (IPDM E/R)
• Ignition relay-2 (fuse block (J/B))
• ACC relay-2 (fuse block (J/B))
• Front blower motor relay

CVT shift selector

P range

Transmission range switch

N, P range

Stop lamp switch

Brake ON/OFF

Power supply position

Engine start/stop condition

Push-button ignition switch op-

eration frequency

Brake pedal

CVT selector lever position

LOCK

→ ACC

Not depressed

Any position

LOCK

→ ACC → ON

Not depressed

Any position

LOCK

→ ACC → ON →

OFF

Not depressed

Any position

LOCK

→ START

ACC

→ START

(Engine start)

Depressed

P or N position (*1)

[If the switch is pressed once,

the engine starts from any pow-
er supply position (LOCK, ACC,

and ON)]

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