2003 NISSAN TEANA ENGINE CONTROL

ENGINE MAINTENANCE (VQ23DE AND VQ35DE)
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When engine coolant overflows disconnected heater hose, connect heater hose, and continue filling the
engine coolant.
6. Install air duct assembly. Refer to EM-131, "
AIR CLEANER AND AIR DUCT" .
7. Install radiator cap.
8. Warm up until opening thermostat. Standard for warming-up time is approximately 10 minutes at 3000
rpm.

Make sure thermostat opening condition by touching radiator hose (lower) to see a flow of warm water.
CAUTION:
Watch water temperature gauge so as not to overheat engine.
9. Stop engine and cool down to less than approximately 50°C (122°F).

Cool down using fan to reduce the time.

If necessary, refill radiator up to filler neck with engine coolant.
10. Refill reservoir tank to “MAX” level line with engine coolant.
11. Repeat steps 3 through 9 two or more times with radiator cap installed until engine coolant level no longer
drops.
12. Check cooling system for leaks with engine running.
13. Warm up engine, and check for sound of engine coolant flow while running engine from idle up to 3,000
rpm with heater temperature controller set at several position between “COOL” and “WARM”.

Sound may be noticeable at heater unit.
14. Repeat step 13 three times.
15. If sound is heard, bleed air from cooling system by repeating step 3 through 9 until engine coolant level no
longer drops.

Clean excess engine coolant from engine.
FLUSHING COOLING SYSTEM
1. Install reservoir tank if removed, and radiator drain plug.
CAUTION:
Be sure to clean drain plug and install with new O-ring.
If cylinder block water drain plugs are removed, close and tighten them. Refer to EM-233, "
ASSEM-
BLY" .
2. Remove air duct assembly. Refer to EM-131, "
AIR CLEANER AND AIR DUCT" . Reservoir tank engine coolant capacity
(At “MAX” level)
: 0.8 (3/4 lmp qt)
SMA412B
Radiator drain plug:
: 1.2 N·m (0.12 kg-m, 11 in-lb)

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POWER SUPPLY, GROUND & CIRCUIT ELEMENTS
K ELECTRICAL
CONTENTS
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POWER SUPPLY, GROUND & CIRCUIT ELEMENTS
POWER SUPPLY ROUTING CIRCUIT ...................... 3
Schematic ................................................................ 3
Wiring Diagram — POWER — ................................. 4
BATTERY POWER SUPPLY — IGNITION SW.
IN ANY POSITION ................................................ 4
ACCESSORY POWER SUPPLY — IGNITION
SW. IN “ACC” OR “ON” ....................................... 10
IGNITION POWER SUPPLY — IGNITION SW.
IN “ON” AND/OR “START” ................................... 11
Fuse ....................................................................... 16
Fusible Link ............................................................ 16
Circuit Breaker ....................................................... 16
IPDM E/R (INTELLIGENT POWER DISTRIBUTION
MODULE ENGINE ROOM) ...................................... 17
System Description ................................................ 17
SYSTEMS CONTROLLED BY IPDM E/R ........... 17
FAIL-SAFE CONTROL ........................................ 17
IPDM E/R STATUS CONTROL ........................... 18
CAN Communication System Description .............. 18
CAN Communication Unit ...................................... 18
Function of Detecting Ignition Relay Malfunction ... 18
CONSULT-II Function (IPDM E/R) ......................... 19
CONSULT-II BASIC OPERATION ....................... 19
SELF-DIAG RESULTS ........................................ 19
DATA MONITOR ................................................. 19
ACTIVE TEST ..................................................... 20
Auto Active Test ..................................................... 21
DESCRIPTION .................................................... 21
OPERATION PROCEDURE ............................... 21
INSPECTION IN AUTO ACTIVE TEST MODE ... 22
Schematic .............................................................. 24
IPDM E/R Terminal Arrangement ........................... 25
Check IPDM E/R Power Supply and Ground Circuit ... 26
Inspection With CONSULT-II (Self-Diagnosis) ....... 27
Removal and Installation of IPDM E/R ................... 28
REMOVAL ........................................................... 28
INSTALLATION ................................................... 28GROUND ................................................................... 29
Ground Distribution ................................................. 29
MAIN HARNESS ................................................. 29
ENGINE ROOM HARNESS(LH) ......................... 33
ENGINE ROOM HARNESS(RH) ......................... 35
ENGINE CONTROL HARNESS/VQ ENGINE
MODELS ............................................................. 36
ENGINE CONTROL HARNESS/QR ENGINE
MODELS ............................................................. 37
BODY HARNESS ................................................ 38
BODY NO. 2 HARNESS ..................................... 40
HARNESS ................................................................. 42
Harness Layout ...................................................... 42
HOW TO READ HARNESS LAYOUT ................. 42
OUTLINE ............................................................. 43
MAIN HARNESS ................................................. 44
ENGINE ROOM HARNESS(LH) ......................... 47
ENGINE ROOM HARNESS(RH) ......................... 49
ENGINE CONTROL HARNESS(VQ ENGINE) ... 51
ENGINE CONTROL HARNESS(QR ENGINE) ... 53
BODY HARNESS ................................................ 55
BODY NO. 2 HARNESS ..................................... 57
ROOM LAMP HARNESS .................................... 59
TAIL HARNESS ................................................... 60
FRONT DOOR HARNESS .................................. 61
REAR DOOR HARNESS .................................... 62
Wiring Diagram Codes (Cell Codes) ...................... 63
ELECTRICAL UNITS LOCATION ............................ 67
Electrical Units Location ......................................... 67
ENGINE COMPARTMENT .................................. 67
PASSENGER COMPARTMENT ......................... 68
LUGGAGE COMPARTMENT .............................. 70
HARNESS CONNECTOR ......................................... 71
Description .............................................................. 71
HARNESS CONNECTOR (TAB-LOCKING
TYPE) .................................................................. 71
HARNESS CONNECTOR (SLIDE-LOCKING
TYPE) .................................................................. 72
HARNESS CONNECTOR (LEVER LOCKING
TYPE) .................................................................. 73

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
PFP:284B7
System DescriptionBKS0024N

IPDM E/R (Intelligent Power Distribution Module Engine Room) integrates the relay box and fuse block
which were originally placed in engine room. It controls integrated relay via IPDM E/R control circuit.

IPDM E/R-integrated control circuit performs ON-OFF operation of relay, CAN communication control, oil
pressure switch signal, hood switch signal reception, etc.

It controls operation of each electrical part via ECM, BCM and CAN communication lines.
CAUTION:
None of the IPDM E/R-integrated relays can be removed.
SYSTEMS CONTROLLED BY IPDM E/R
FAIL-SAFE CONTROL

When CAN communication with other control units is impossible, IPDM E/R performs fail-safe control.
After CAN communication recovers normally, it also returns to normal control.

Operation of control parts by IPDM E/R during fail-safe mode is as follows:
Control system Transmit control unit Control part
Lamp control BCM

Headlamp (HI, LO)

Parking, license plate and tail lamps

Front fog lamp
Wiper control BCM Front wiper
Rear window defogger control BCM Rear window defogger
A/C compressor control ECM A/C compressor (magnet clutch)
Cooling fan control ECM Cooling fan
Horn control BCM Horn
Controlled system Fail-safe mode
Headlamp

With the ignition switch ON, low beam headlamp is ON.

With the ignition switch OFF, low beam headlamp is OFF.
Parking, license plate and tail lamps

With the ignition switch ON, parking, license plate and tail lamps are ON.

With the ignition switch OFF, parking, license plate and tail lamps are OFF.
Cooling fan

With the ignition switch ON, cooling fan HI operates.

With the ignition switch OFF, cooling fan stops.
Front wiperUntil the ignition switch is turned OFF, front wiper LO and HI remains in the same status it was
in just before fail−safe control was initiated.
Rear window defogger Rear window defogger is OFF.
A/C compressor A/C compressor is OFF.
Front fog lamp Front fog lamp is OFF.

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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

IPDM E/R STATUS CONTROL
In order to save power, IPDM E/R switches status by itself based on each operating condition.
1. CAN communication status

CAN communication is normally performed with other control units.

Individual unit control by IPDM E/R is normally performed.

When sleep request signal is received from BCM, mode is switched to sleep waiting status.
2. Sleep waiting status

Process to stop CAN communication is activated.

All systems controlled by IPDM E/R are stopped. When 3 seconds have elapsed after CAN communi-
cation with other control units is stopped, mode switches to sleep status.
3. Sleep status

IPDM E/R operates in low power mode.

CAN communication is stopped.

When a change in CAN communication line is detected, mode switches to CAN communication status.

When a change hood switch or ignition switch signal is detected, mode switches to CAN communica-
tion status.
CAN Communication System DescriptionBKS0024O
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. Modern
vehicles are equipped with many electronic control units and each control unit shares information and links
with other control units during operation (not independent). In CAN communication, control units are con-
nected 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.
CAN Communication UnitBKS0024P
Refer to LAN-49, "CAN System Specification Chart" .
Function of Detecting Ignition Relay MalfunctionBKS0024Q

When contact point of integrated ignition relay is stuck and cannot be turned OFF, IPDM E/R turns ON tail
and parking lamps for 10 minutes to indicate ignition relay malfunction.

When a state of ignition relay having built-in does not agree with a state of Ignition switch signal input by a
CAN communication from BCM, IPDM E/R lets tail lamp relay operate.
NOTE:
When the ignition switch is turned ON, the tail lamp is OFF.
Ignition switch signal Ignition relay status Tail lamp relay
ON ON —
OFF OFF —
ON OFF —
OFF ON ON (10 minutes)

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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CONSULT-II Function (IPDM E/R)BKS0024R
CONSULT-II can display each diagnostic item using the diagnostic test mode shown following.
CONSULT-II BASIC OPERATION
Refer to GI-34, "CONSULT-II Start Procedure" .
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.
SELF-DIAG RESULTS
Operation Procedure
1. Touch “SELF-DIAG RESULTS” on “SELECT DIAG MODE” screen.
2. Check display content in self-diagnostic results.
Display Item List
NOTE:
The details for display of the period are as follows:

CRNT: Error currently detected with IPDM E/R.

PAST: Error detected in the past and memorized with IPDM E/R.
DATA MONITOR
Operation Procedure
1. Touch “DATA MONITOR” on “SELECT DIAG MODE” screen.
2. Touch “ALL SIGNALS”, “MAIN SIGNALS” or “SELECTION FROM MENU” on “SELECT MONITOR ITEM”
screen.
3. When “ALL SIGNALS” is selected, all items will be monitored. When “MAIN SIGNALS” is selected, prede-
termined items will be monitored. When “SELECTION FROM MENU” is selected, touch individual items to
be monitored.
4. Touch “START”.
5. Touch “RECORD” while monitoring to record the status of the item being monitored. To stop recording,
touch “STOP”.
Inspection Item, Diagnosis Mode Description
SELF-DIAG RESULTS The IPDM E/R performs diagnosis of the CAN communication and self-diagnosis.
DATA MONITOR The input/output data of the IPDM E/R is displayed in real time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read.
ACTIVE TEST The IPDM E/R sends a drive signal to electronic components to check their operation.
Display ItemsCONSULT-II
display codeMalfunction detecting conditionTIME
Possible causes
CRNT PAST
NO DTC IS
DETECTED.FURTHER
TESTING MAY BE
REQUIRED.-----
CAN COMM CIRC U1000

If CAN communication reception/transmission
data has a malfunction, or if any of the control
units malfunction, data reception/transmission
cannot be confirmed.

When the data in CAN communication is not
received before the specified time××Any of or several items
below have errors.

TRANSMIT DIAG

ECM

BCM / SEC
ALL SIGNALS All items will be monitored.
MAIN SIGNALS Monitor the predetermined item.
SELECTION FROM MENU Select any item for monitoring.

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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

All Items, Main Items, Selection From Menu
NOTE:

Perform monitoring of IPDM E/R data with the ignition switch ON. When the ignition switch is at ACC, the display may not be cor-
rect.

*1: The vehicle without the Intelligent Key system displays only ON without change.

*2: This item is displayed, but does not function.
ACTIVE TEST
Operation Procedure
1. Touch “ACTIVE TEST” on “SELECT DIAG MODE” screen.
2. Touch item to be tested.
3. Touch “START”, and confirm its operation.
4. Touch “OFF” while testing to stop the operation.
CONSULT-II
screen displayItem name Display or unitMonitor item selection
Description
ALL
SIGNALSMAIN
SIGNALSSELEC-
TION
FROM
MENU
MOTOR FAN REQ Motor fan request 1/2/3/4×× ×Signal status input from ECM
AC COMP REQ Compressor request ON/OFF×× ×Signal status input from ECM
TAIL&CLR REQ Tail & clear request ON/OFF×× ×Signal status input from BCM
HL LO REQ Headlamp LO request ON/OFF×× ×Signal status input from BCM
HL HI REQ Headlamp HI request ON/OFF×× ×Signal status input from BCM
FR FOG REQ Front fog request ON/OFF×× ×Signal status input from BCM
HL WASHER REQHeadlamp washer
requestON/OFF××Signal status input from head-
lamp washer switch
FR WIP REQ Front wiper requestSTOP/1LOW/
LOW/HI×× ×Signal status input from BCM
WIP AUTO STOP Wiper auto stop ACT P/STOP P×× ×Output status of IPDM E/R
WIP PROT Wiper protection OFF/BLOCK×× ×Control status of IPDM E/R
ST RLY REQ
*1Starter request ON/OFF××Status of input signal
IGN RLY Ignition relay status ON/OFF×× ×Ignition relay status monitored
with IPDM E/R
RR DEF REQRear window defogger
requestON/OFF×× ×Signal status input from BCM
OIL P SW Oil pressure switch OPEN/CLOSE××Signal status input in IPDM E/R
DTRL REQ*
2Daytime running light
requestON/OFF××—
HOOD SW
*2Hood switch ON/OFF××—
THFT HRN REQTheft warning horn
requestON/OFF××Signal status input from BCM
HORN CHIRP
*2Horn chirp ON/OFF××—
CONSULT-II screen display Test item Description
TAIL LAMPParking, license plate and tail
lamps operationTail lamp relay is operated by switching operation ON-OFF.
REAR DEFOGGER Rear window defogger operation Rear defogger relay is operated by switching operation ON-OFF.

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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Concept of Auto Active Test

IPDM E/R actuates auto active test mode when it receives door switch signal from BCM via CAN commu-
nication line. Therefore, when auto active test mode is activated successfully, CAN communication
between IPDM E/R and BCM is normal.

If any of systems controlled by IPDM E/R cannot be operated, possible cause can be easily diagnosed
using auto active test.
Diagnosis chart in auto active test mode
Symptom Inspection contents Possible cause
Any of front wiper, park-
ing, license plate and
tail lamps, front fog
lamp, and headlamp
(HI, LO) do not operate.Perform auto active
test. Does system in
question operate?YES

BCM signal input system malfunction
NO

Lamp/wiper motor malfunction

Lamp/wiper motor ground circuit malfunction

Harness/connector malfunction between IPDM E/R and system in ques-
tion

IPDM E/R (integrated relay) malfunction
Rear window defogger
does not operate.Perform auto active
test. Does rear win-
dow defogger oper-
ate?YES

BCM signal input circuit malfunction
NO

Rear window defogger relay malfunction

Harness/connector malfunction between IPDM E/R and rear window
defogger relay

Open circuit of rear window defogger

IPDM E/R malfunction
A/C compressor does
not operate.Perform auto active
test. Does magnetic
clutch operate?YES

BCM signal input circuit malfunction

CAN communication signal between BCM and ECM.

CAN communication signal between ECM and IPDM E/R
NO

Magnetic clutch malfunction

Harness/connector malfunction between IPDM E/R and magnetic clutch

IPDM E/R (integrated relay) malfunction
Cooling fan does not
operate.Perform auto active
test. Does cooling fan
operate?YES

ECM signal input circuit

CAN communication signal between ECM and IPDM E/R
NO

Cooling fan motor malfunction

Harness/connector malfunction between IPDM E/R and cooling fan
motor

IPDM E/R (integrated relay) malfunction
Oil pressure warning
lamp does not operate.Perform auto active
test. Does oil pres-
sure warning lamp
blink?YES

Harness/connector malfunction between IPDM E/R and oil pressure
switch

Oil pressure switch malfunction

IPDM E/R malfunction
NO

CAN communication signal between BCM and Unified Meter and A/C
Amp.

Combination meter

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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Inspection With CONSULT-II (Self-Diagnosis)BKS0024W
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which performs CAN communication.
1. CHECK SELF DIAGNOSTIC RESULT
1. Connect CONSULT-II and select “IPDM E/R” on “SELECT SYSTEM” screen.
2. Select “SELF-DIAG RESULTS” on the “SELECT DIAG MODE” screen.
3. Check display content in self diagnostic results.
NOTE:
The details for display of the period are as follows:

CRNT: Error currently detected with IPDM E/R.

PAST: Error detected in the past and memorized with IPDM E/R.
Contents displayed
NO DTC IS DETECTED.FURTHER TESTING MAY BE REQUIRED.>>INSPECTION END
CAN COMM CIRC>>Print out the self-diagnostic results and refer to LAN-42, "
Precautions When Using
CONSULT-II" .
CONSULT-II displayCONSULT-II
display codeTIME
Details of diagnosis result
CRNT PAST
NO DTC IS DETECTED.
FURTHER TESTING MAY BE REQUIRED.- - - No malfunction
CAN COMM CIRC U1000××Any of or several items below have errors.

TRANSMIT DIAG

ECM

BCM / SEC