cooling fan INFINITI QX56 2011 Factory Manual PDF

PCS-8
< SYSTEM DESCRIPTION >[IPDM E/R]
SYSTEM
POWER CONTROL SYSTEM : System Diagram
INFOID:0000000006220164
POWER CONTROL SYSTEM : System DescriptionINFOID:0000000006220165
COOLING FAN CONTROL
IPDM E/R outputs cooling fan control signal (PWM signal ) to the electrically-controlled cooling fan coupling
according to the status of the cooling fan speed request signal received from ECM via CAN communication.
Refer to EC-41, "
COOLING FAN CONTROL : System Diagram".
ALTERNATOR CONTROL
IPDM E/R outputs power generation command signal (PWM signal ) to the alternator according to the status of
the power generation command value signal received from ECM via CAN communication. Refer to CHG-7,
"POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM : System Diagram".
SIGNAL BUFFER SYSTEM
SIGNAL BUFFER SYSTEM : System DiagramINFOID:0000000006220166
SIGNAL BUFFER SYSTEM : System DescriptionINFOID:0000000006220167
 IPDM E/R reads the status of the oil pressure switch and transmits the oil pressure switch signal to BCM via
CAN communication. Refer to MWI-15, "
OIL PRESSURE WARNING LAMP : System Diagram".
 IPDM E/R reads the status of the hood switch and tr ansmits the hood switch signal to BCM via CAN commu-
nication. Refer to SEC-17, "
VEHICLE SECURITY SYSTEM : System Diagram".
 IPDM E/R receives the rear window defogger control signal from BCM via CAN communication and trans- mits it to ECM and AV control unit via CAN communication. Refer to DEF-6, "
System Diagram".
POWER CONSUMPTION CONTROL SYSTEM
JMMIA0491GB
JPMIA0952GB
Revision: 2010 May2011 QX56

PCS-12
< SYSTEM DESCRIPTION >[IPDM E/R]
DIAGNOSIS SYSTEM (IPDM E/R)
CONSULT-III Function (IPDM E/R)
INFOID:0000000006220171
APPLICATION ITEM
CONSULT-III performs the following functions via CAN communication with IPDM E/R.
SELF DIAGNOSTIC RESULT
Refer to PCS-22, "DTCIndex".
DATA MONITOR
Monitor item
Oil pressure warning lamp does not operate Perform auto active test.
Does the oil pressure warning
lamp blink?YES
 Harness or connector be-
tween IPDM E/R and oil
pressure switch
 Oil pressure switch
IPDM E/R
NO  CAN communication signal
between IPDM E/R and
BCM
 CAN communication signal
between BCM and combi-
nation meter
 Combination meter
Symptom Inspection contents Possible cause
Diagnosis mode Description
Ecu Identification Allows confirmation of IPDM E/R part number.
Self Diagnostic Result Displays the diagnosis results judged by IPDM E/R.
Data Monitor Displays the real-time input/output data from IPDM E/R input/output data.
Active Test IPDM E/R can provide a drive signal to electronic components to check their operations.
CAN Diag Support Monitor The results of transmit/receive diagnosis of CAN communication can be read.
Monitor Item [Unit] MAIN SIG-
NALS Description
RAD FAN REQ
[1/2/3/4] ×Displays the value of the cooling fan speed request signal received from ECM via
CAN communication.
AC COMP REQ
[Off/On] ×Displays the status of the A/C compressor request signal received from ECM via
CAN communication.
TA I L & C L R R E Q
[Off/On] ×
Displays the status of the position light request signal received from BCM via CAN
communication.
HL LO REQ
[Off/On] ×Displays the status of the low beam request signal received from BCM via CAN
communication.
HL HI REQ
[Off/On] ×Displays the status of the high beam request signal received from BCM via CAN
communication.
FR FOG REQ
[Off/On] ×Displays the status of the front fog light request signal received from BCM via
CAN communication.
FR WIP REQ
[Stop/1LOW/Low/Hi] ×
Displays the status of the front wiper request signal received from BCM via CAN
communication.
WIP AUTO STOP
[STOP P/ACT P] ×
Displays the status of the front wiper auto stop signal judged by IPDM E/R.
WIP PROT
[Off/BLOCK] ×
Displays the status of the front wiper fail-safe operation judged by IPDM E/R.
IGN RLY1 -REQ
[Off/On] Displays the status of the ignition switch ON signal received from BCM via CAN
communication.
IGN RLY
[Off/On] ×
Displays the status of the ignition relay judged by IPDM E/R.
Revision: 2010 May2011 QX56

PCS
DIAGNOSIS SYSTEM (IPDM E/R)PCS-13
< SYSTEM DESCRIPTION > [IPDM E/R]
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ACTIVE TEST
Te s t i t e m
PUSH SW
[Off/On]
Displays the status of the push-button ignition switch judged by IPDM E/R.
INTER/NP SW
[Off/On] Displays the status of the shift position judged by IPDM E/R.
ST RLY CONT
[Off/On] Displays the status of the starter relay status signal received from BCM via CAN
communication.
IHBT RLY -REQ
[Off/On] Displays the status of the starter control relay signal received from BCM via CAN
communication.
ST/INHI RLY
[Off/ ST ON/INHI ON/UNKWN] Displays the status of the starter relay and starter control relay judged by IPDM
E/R.
DETENT SW
[Off/On] Displays the status of the A/T shift selector (detention switch) judged by IPDM E/
R.
S/L RLY -REQ
[Off/On] Displays the status of the steering lock relay signal received from BCM via CAN
communication.
S/L STATE
[LOCK/UNLK/UNKWN] Displays the status of the steering lock judged by IPDM E/R.
OIL P SW
[Open/Close] Displays the status of the oil pressure switch judged by IPDM E/R.
HOOD SW
[Off/On] Displays the status of the hood switch judged by IPDM E/R.
HL WASHER REQ
[Off/On] Displays the status of the headlamp washer request signal received from BCM via
CAN communication.
THFT HRN REQ
[Off/On] Displays the status of the theft warning horn request signal received from BCM
via CAN communication.
HORN CHIRP
[Off/On] Displays the status of the horn reminder signal received from BCM via CAN com-
munication.
Monitor Item
[Unit] MAIN SIG-
NALS Description
Test item Operation Description
CORNERING LAMP LH
NOTE:
This item is indicated, but cannot be tested.
RH
HORN On Operates horn relay for 20 ms.
REAR DEFOGGER Off OFF
On Operates the rear window defogger relay.
FRONT WIPER Off OFF
Lo Operates the front wiper relay.
Hi Operates the front wiper relay and front wiper high relay.
MOTOR FAN* 1OFF
2 Transmits 50% pulse duty signal (PWM signal) to the cooling fan control module.
3 Transmits 75% pulse duty signal (PWM signal) to the cooling fan control module.
4
Transmits 100% pulse duty signal (PWM signal) to the cooling fan control mod-
ule.
HEAD LAMP WASHER On Operates the headlamp washer relay for 1 second.
Revision: 2010 May2011 QX56

PCS-18
< ECU DIAGNOSIS INFORMATION >[IPDM E/R]
IPDM E/R
17
(B) Ground Cooling fan motor
ground
Output Ignition switch ON 0 V
18
(B) Ground Ground — Ignition switch ON 0 V
19
(V) Ground Front fog lamp (RH) Output Lighting
switch 2ND or
AUTO (Light
is illuminated)Front fog lamp switch
OFF
0 V
Front fog lamp switch ON Battery voltage
20
(W) Ground Front fog lamp (LH) Output Lighting
switch 2ND or
AUTO (Light
is illuminated)Front fog lamp switch
OFF
0 V
Front fog lamp switch ON Battery voltage
21
(L) Ground
Headlamp washer re-
lay control Output
Ignition switch
ON Headlamp washer acti-
vated
0 V
Headlamp washer deacti-
vated 12 V
23
(GR/R) Ground Cranking request Output Select lever P or N (Ignition switch ON) 0 V
Select lever in any position other than P or
N (Ignition switch ON)
12 V
Engine running 12 V
24
(W/G) Ground Oil pressure switch Input Ignition switch
ONEngine stopped 0 V
Engine running 12 V
25
(L/Y) Ground Front wiper stop posi-
tion InputIgnition switch
ON Front wiper stop position 0 V
Any position other than
front wiper stop position
12 V
26
(P) Ground CAN-L Input/
Output ——
27
(L) Ground CAN-H
Input/
Output ——
30
(R/W) Ground Starter relay control Output  Ignition switch OFF or ACC
 At engine cranking
0 V
 Ignition switch ON
 Engine running 12 V
31
(B) Ground Injector relay control Output  Approximately 1 second after turning
the ignition switch ON
 Engine running 0 - 1.5 V
Approximately 1 second or more after turn-
ing the ignition switch ON Battery voltage
32
(LG) Ground Hood switch Input Close the hood 12 V
Open the hood 0 V
33
(R) Ground Alternator control Output Ignition switch OFF or ACC 0 V
Ignition switch ON 6 V
34
(P/B) Ground Horn relay control Output The horn is deactivated Battery voltage
The horn is activated 0 V
Te r m i n a l N O .
(Wire color) Description
Condition Va l u e
(Approx.)
Signal name Input/
Output
+–
Revision: 2010 May2011 QX56

PCS
IPDM E/RPCS-21
< ECU DIAGNOSIS INFORMATION > [IPDM E/R]
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Fail-SafeINFOID:0000000006220173
CAN COMMUNICATION CONTROL
When CAN communication with ECM and BCM is impossible,
IPDM E/R performs fail-safe control. After CAN
communication recovers normally, it also returns to normal control.
If No CAN Communication Is Available With ECM
If No CAN Communication Is Available With BCM
66
(SB) Ground
Push-button ignition
switch InputPress the push-button ignition switch 0 V
Release the push-button ignition switch 12 V
68
(O) Ground Ignition relay monitor Input Ignition switch OFF or ACC 12 V
Ignition switch ON 0 V
69
(W/B) Ground Ignition power supply Output Ignition switch OFF or ACC 0 V
Ignition switch ON Battery voltage
72
(Y/R) Ground Cooling fan control Output Ignition switch
OFF 5 V
ACC 0 V
ON
2. 5 V
Engine running
Te r m i n a l N O .
(Wire color) Description
Condition Va l u e
(Approx.)
Signal name Input/
Output
+–
JMMIA0404GB
Control part Fail-safe operation
Cooling fan  Transmits the pulse duty signal (PWM signal) 100% when the ignition switch is turned ON.
 Transmits the pulse duty signal (PWM signal)
0% when the ignition switch is turned OFF.
A/C compressor A/C relay OFF
Alternator Transmits the power generation command signal (PWM signal) 0%
Control part Fail-safe operation
Headlamp  Turns ON the headlamp low relay when the ignition switch is turned ON
 Turns OFF the headlamp low relay when the ignition switch is turned OFF
 Headlamp high relay OFF
Parking lamp
 License plate lamp
 Illumination
 Tail lamp
 Side marker lamp  Turns ON the tail lamp relay when the ignition switch is turned ON
 Turns OFF the tail lamp relay when the ignition switch is turned OFF
Front wiper motor  The status just before activation of fail-safe control is maintained until the ignition switch is
turned OFF while the front wiper is operating at LO or HI speed.
 The wiper is operated at LO speed until the ignition switch is turned OFF if the fail-safe con-
trol is activated while the front wiper is set in the INT mode and the front wiper motor is op-
erating.
 Return automatically wiper to stop position when ignition switch is turned ON if fail-safe con-
trol is activated while front wiper motor is operated and wiper stops in the other position than
stop position.
Front fog lamp Front fog lamp relay OFF
Horn Horn OFF
Revision: 2010 May2011 QX56

SEC-28
< SYSTEM DESCRIPTION >[WITH INTELLIGENT KEY SYSTEM]
DIAGNOSIS SYSTEM (IPDM E/R)
DIAGNOSIS SYSTEM (IPDM E/R)
CONSULT-III Function (IPDM E/R)INFOID:0000000006365348
APPLICATION ITEM
CONSULT-III performs the following functions via CAN communication with IPDM E/R.
SELF DIAGNOSTIC RESULT
Refer to
PCS-22, "DTCIndex".
DATA MONITOR
Monitor item
Diagnosis mode Description
Ecu Identification Allows confirmation of IPDM E/R part number.
Self Diagnostic Result Displays the diagnosis results judged by IPDM E/R.
Data Monitor Displays the real-time input/output data from IPDM E/R input/output data.
Active Test IPDM E/R can provide a drive signal to electronic components to check their operations.
CAN Diag Support Monitor The results of transmit/receive diagnosis of CAN communication can be read.
Monitor Item [Unit] MAIN SIG-
NALS Description
RAD FAN REQ
[1/2/3/4] ×
Displays the value of the cooling fan speed request signal received from ECM via
CAN communication.
AC COMP REQ
[Off/On] ×Displays the status of the A/C compressor request signal received from ECM via
CAN communication.
TA I L & C L R R E Q
[Off/On] ×Displays the status of the position light request signal received from BCM via CAN
communication.
HL LO REQ
[Off/On] ×
Displays the status of the low beam request signal received from BCM via CAN
communication.
HL HI REQ
[Off/On] ×Displays the status of the high beam request signal received from BCM via CAN
communication.
FR FOG REQ
[Off/On] ×Displays the status of the front fog light request signal received from BCM via
CAN communication.
FR WIP REQ
[Stop/1LOW/Low/Hi] ×
Displays the status of the front wiper request signal received from BCM via CAN
communication.
WIP AUTO STOP
[STOP P/ACT P] ×
Displays the status of the front wiper auto stop signal judged by IPDM E/R.
WIP PROT
[Off/BLOCK] ×
Displays the status of the front wiper fail-safe operation judged by IPDM E/R.
IGN RLY1 -REQ
[Off/On] Displays the status of the ignition switch ON signal received from BCM via CAN
communication.
IGN RLY
[Off/On] ×
Displays the status of the ignition relay judged by IPDM E/R.
PUSH SW
[Off/On] Displays the status of the push-button ignition switch judged by IPDM E/R.
INTER/NP SW
[Off/On] Displays the status of the shift position judged by IPDM E/R.
ST RLY CONT
[Off/On] Displays the status of the starter relay status signal received from BCM via CAN
communication.
IHBT RLY -REQ
[Off/On] Displays the status of the starter control relay signal received from BCM via CAN
communication.
ST/INHI RLY
[Off/ ST ON/INHI ON/UNKWN] Displays the status of the starter relay and starter control relay judged by IPDM
E/R.
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (IPDM E/R)SEC-29
< SYSTEM DESCRIPTION > [WITH INTELLIGENT KEY SYSTEM]
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ACTIVE TEST
Te s t i t e m
*: Operates while the engine is running. DETENT SW
[Off/On]
Displays the status of the A/T shift selector (detention switch) judged by IPDM E/
R.
S/L RLY -REQ
[Off/On] Displays the status of the steering lock relay signal received from BCM via CAN
communication.
S/L STATE
[LOCK/UNLK/UNKWN] Displays the status of the steering lock judged by IPDM E/R.
OIL P SW
[Open/Close] Displays the status of the oil pressure switch judged by IPDM E/R.
HOOD SW
[Off/On] Displays the status of the hood switch judged by IPDM E/R.
HL WASHER REQ
[Off/On] Displays the status of the headlamp washer request signal received from BCM via
CAN communication.
THFT HRN REQ
[Off/On] Displays the status of the theft warning horn request signal received from BCM
via CAN communication.
HORN CHIRP
[Off/On] Displays the status of the horn reminder signal received from BCM via CAN com-
munication.
Monitor Item
[Unit] MAIN SIG-
NALS Description
Test item Operation Description
CORNERING LAMP LH
NOTE:
This item is indicated, but cannot be tested.
RH
HORN On Operates horn relay for 20 ms.
REAR DEFOGGER Off OFF
On Operates the rear window defogger relay.
FRONT WIPER Off OFF
Lo Operates the front wiper relay.
Hi Operates the front wiper relay and front wiper high relay.
MOTOR FAN* 1OFF
2 Transmits 50% pulse duty signal (PWM signal) to the cooling fan control module.
3 Transmits 75% pulse duty signal (PWM signal) to the cooling fan control module.
4
Transmits 100% pulse duty signal (PWM signal) to the cooling fan control mod-
ule.
HEAD LAMP WASHER On Operates the headlamp washer relay for 1 second.
EXTERNAL LAMPS Off OFF
TAIL Operates the tail lamp relay.
Lo Operates the headlamp low relay.
Hi
Operates the headlamp low relay and ON/OFF the headlamp high relay at 1 sec-
ond intervals.
Fog Operates the front fog lamp relay.
Revision: 2010 May2011 QX56

WW-20
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (IPDM E/R)
CONSULT-III Function (IPDM E/R)
INFOID:0000000006349815
APPLICATION ITEM
CONSULT-III performs the following functions via CAN communication with IPDM E/R.
SELF DIAGNOSTIC RESULT
Refer to PCS-22, "DTCIndex".
DATA MONITOR
Monitor item
Oil pressure warning lamp does not operate Perform auto active test.
Does the oil pressure warning
lamp blink?YES
 Harness or connector be-
tween IPDM E/R and oil
pressure switch
 Oil pressure switch
IPDM E/R
NO  CAN communication signal
between IPDM E/R and
BCM
 CAN communication signal
between BCM and combi-
nation meter
 Combination meter
Symptom Inspection contents Possible cause
Diagnosis mode Description
Ecu Identification Allows confirmation of IPDM E/R part number.
Self Diagnostic Result Displays the diagnosis results judged by IPDM E/R.
Data Monitor Displays the real-time input/output data from IPDM E/R input/output data.
Active Test IPDM E/R can provide a drive signal to electronic components to check their operations.
CAN Diag Support Monitor The results of transmit/receive diagnosis of CAN communication can be read.
Monitor Item [Unit] MAIN SIG-
NALS Description
RAD FAN REQ
[1/2/3/4] ×Displays the value of the cooling fan speed request signal received from ECM via
CAN communication.
AC COMP REQ
[Off/On] ×Displays the status of the A/C compressor request signal received from ECM via
CAN communication.
TA I L & C L R R E Q
[Off/On] ×
Displays the status of the position light request signal received from BCM via CAN
communication.
HL LO REQ
[Off/On] ×Displays the status of the low beam request signal received from BCM via CAN
communication.
HL HI REQ
[Off/On] ×Displays the status of the high beam request signal received from BCM via CAN
communication.
FR FOG REQ
[Off/On] ×Displays the status of the front fog light request signal received from BCM via
CAN communication.
FR WIP REQ
[Stop/1LOW/Low/Hi] ×
Displays the status of the front wiper request signal received from BCM via CAN
communication.
WIP AUTO STOP
[STOP P/ACT P] ×
Displays the status of the front wiper auto stop signal judged by IPDM E/R.
WIP PROT
[Off/BLOCK] ×
Displays the status of the front wiper fail-safe operation judged by IPDM E/R.
IGN RLY1 -REQ
[Off/On] Displays the status of the ignition switch ON signal received from BCM via CAN
communication.
IGN RLY
[Off/On] ×
Displays the status of the ignition relay judged by IPDM E/R.
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (IPDM E/R)WW-21
< SYSTEM DESCRIPTION >
C
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M A
B
WW
N
O P
ACTIVE TEST
Te s t i t e m
PUSH SW
[Off/On] Displays the status of the push-button ignition switch judged by IPDM E/R.
INTER/NP SW
[Off/On] Displays the status of the shift position judged by IPDM E/R.
ST RLY CONT
[Off/On] Displays the status of the starter relay status signal received from BCM via CAN
communication.
IHBT RLY -REQ
[Off/On] Displays the status of the starter control relay signal received from BCM via CAN
communication.
ST/INHI RLY
[Off/ ST ON/INHI ON/UNKWN] Displays the status of the starter relay and starter control relay judged by IPDM
E/R.
DETENT SW
[Off/On] Displays the status of the A/T shift selector (detention switch) judged by IPDM E/
R.
S/L RLY -REQ
[Off/On] Displays the status of the steering lock relay signal received from BCM via CAN
communication.
S/L STATE
[LOCK/UNLK/UNKWN] Displays the status of the steering lock judged by IPDM E/R.
OIL P SW
[Open/Close] Displays the status of the oil pressure switch judged by IPDM E/R.
HOOD SW
[Off/On] Displays the status of the hood switch judged by IPDM E/R.
HL WASHER REQ
[Off/On] Displays the status of the headlamp washer request signal received from BCM via
CAN communication.
THFT HRN REQ
[Off/On] Displays the status of the theft warning horn request signal received from BCM
via CAN communication.
HORN CHIRP
[Off/On] Displays the status of the horn reminder signal received from BCM via CAN com-
munication.
Monitor Item
[Unit] MAIN SIG-
NALS Description
Test item Operation Description
CORNERING LAMP LH
NOTE:
This item is indicated, but cannot be tested.
RH
HORN On Operates horn relay for 20 ms.
REAR DEFOGGER Off OFF
On Operates the rear window defogger relay.
FRONT WIPER Off OFF
Lo Operates the front wiper relay.
Hi Operates the front wiper relay and front wiper high relay.
MOTOR FAN* 1OFF
2 Transmits 50% pulse duty signal (PWM signal) to the cooling fan control module.
3 Transmits 75% pulse duty signal (PWM signal) to the cooling fan control module.
4
Transmits 100% pulse duty signal (PWM signal) to the cooling fan control mod-
ule.
HEAD LAMP WASHER On Operates the headlamp washer relay for 1 second.
Revision: 2010 May2011 QX56