relay INFINITI QX4 2005 Factory Service Manual

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ACS-29
[ICC]
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ACTIVE TEST
CAUTION:
Do not perform the active test while driving. Active test cannot be started while ICC system warning
indicator is illuminated.
Active Test
1. Touch “ACTIVE TEST” on "SELECT DIAG MODE" screen.
IDLE SW
[ON/OFF]
××Indicates [ON/OFF] status of idle switch
read by ICC unit via CAN communication
(ECM transmits ON/OFF status via CAN
communication).
GEAR
[1, 2, 3, 4, 5]××Indicates A/T gear position read by ICC unit
via CAN communication (TCM transmits
gear position via CAN communication).
BUZZER O/P
[ON/OFF] ×Indicates [ON/OFF] status of ICC warning
output.
ICC WARNING×NOTE:
This item is displayed but cannot be moni-
tored.
VHCL SPD AT
[km/h] or [mph]
×Indicates vehicle speed calculated from A/T
vehicle speed sensor by ICC unit via CAN
communication (TCM transmits A/T vehicle
speed sensor signal via CAN communica-
tion).
PRESS SENS
[bar]×××Indicates brake fluid pressure value calcu-
lated from signal voltage of pressure sen-
sor.
PRESS SENS 2
[bar]××NOTE:
This item is displayed but cannot be moni-
tored.
D RANGE SW
[ON/OFF]
××Indicates [ON/OFF] status of “D” position
read by ICC unit via CAN communication
(TCM transmits ON/OFF condition of “D”
position via CAN communication).
AT OD OFF
[ON/OFF]×Indicates [ON/OFF] status of OD cancel
output under control.
NP RANGE SW
[ON/OFF]
××Indicates PNP switch signal read by ICC
unit via CAN communication. (TCM trans-
mits PNP switch signal via CAN communi-
cation)
DISTANCE×NOTE:
This item is displayed but cannot be moni-
tored.
RELATIVE SPD×NOTE:
This item is displayed but cannot be moni-
tored.
STP LMP DRIVE
[ON/OFF]××Indicates [ON/OFF] status of brake hold
relay drive output. Monitored Item [unit] MAIN SIGNALSECU
INPUT
SIGNALSSELECTION
FROM MENUDescription

ACS-36
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: October 20052005 QX56
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMSPFP:00000
Diagnostic Trouble Code (DTC) ChartEKS00BLZ
×:Applicable
DTC
No.CONSULT-II screen termsICC sys-
tem
warning
lampFail-safe
Malfunctions detected where...Refer-
ence
page Vehicle-
to-vehi-
cle dis-
tance
control
modeConven-
tional
(fixed
speed)
cruise
control
modeBrake
assist
(with pre-
view
function)
11 CONTROL UNIT××××

ICC unit internal malfunctionACS-37
12 VDC CONTROL UNIT××××

VDC malfunction

Brake booster signal harness is
open or shortedACS-37
20 CAN COMM CIRCUIT××××
ICC unit detected CAN communi-
cation malfunctionACS-38
31 POWER SUPPLY CIR1××××
ICC unit power supply voltage is
excessively low (less than 8V)ACS-38
34 POWER SUPPLY CIR2××××
ICC unit power supply voltage is
excessively high.ACS-38
41 VHCL SPEED SE CIRC××××

Wheel sensor malfunction

ABS actuator and electric unit
(control unit) malfunction

A/T vehicle speed sensor mal-
function

TCM malfunctionACS-39
43 VDC/TCS/ABS CIRC××××
VDC/TCS/ABS system malfunc-
tionACS-39
45 BRAKE SW/ STOP L SW××××

ICC brake switch or stop lamp
switch harness is open or shorted

ICC brake switch or stop lamp
switch is stuck to OFF

ICC brake switch or stop lamp
switch is stuck to ONACS-40
46 OPERATION SW CIRC×××

ICC steering switch harness or
spiral cable is open or shorted

ICC steering switch malfunctionACS-41
74 LASER BEAM OFF CNTR×× ×
Laser beam of ICC sensor is off
the aiming pointACS-43
90 STOP LAMP RLY FIX×× ×
Normally open terminal of stop
lamp relay is stuckACS-43
92 ECM CIRCUIT××××

ECM malfunction

Accelerator pedal position sensor
malfunction

ICC unit malfunctionACS-48
96 NP RANGE×××

Park/neutral position switch har-
ness is open or shorted

Park/neutral position switch mal-
function

TCM malfunctionACS-48
97 AT CIRCUIT×××
TCM malfunctionACS-49

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
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5. CHECK STOP LAMP ILLUMINATION
Check stop lamp illumination.
OK or NG
OK >> GO TO 6.
NG >>

Check stop lamp circuit. Refer to LT- 1 0 3 , "STOP LAMP" .

Erase DTC and perform ICC system running test. Refer to ACS-9, "ICC System Running Test"
. Then perform self-diagnosis of ICC system again.
6. CHECK ICC BRAKE HOLD RELAY
1. Turn ignition switch OFF.
2. Remove ICC brake hold relay.
3. Check continuity between ICC brake hold relay terminals.
OK or NG
OK >> GO TO 7.
NG >> Replace ICC brake hold relay. Erase DTC and perform
ICC system running test. Refer to ACS-9, "
ICC System
Running Test" . Then perform self-diagnosis of ICC sys-
tem again.
7. CHECK ICC BRAKE HOLD RELAY CIRCUIT
1. Disconnect ICC unit and stop lamp switch connectors.
2. Check continuity between ICC unit harness connector B17 ter-
minal 38 (R/G) and ICC brake hold relay harness connector
E134 terminal 7 (R/G).
3. Check continuity between ICC unit harness connector B17 ter-
minal 38 (R/G) and stop lamp switch harness connector E38 ter-
minal 4 (R/G).
OK or NG
OK >> Replace ICC unit. Refer to ACS-60, "ICC Unit" . Erase
DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test" . Then
perform self-diagnosis of ICC system again.
NG >>

Repair harness between ICC unit and ICC brake hold relay or stop lamp switch.

Erase DTC and perform ICC system running test. Refer to ACS-9, "ICC System Running Test"
. Then perform self-diagnosis of ICC system again.
DTC 46 OPERATION SW CIRCEKS00BM7
1. CHECK ECM CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect ECM connector and connect it securely again. Erase DTC, then perform self-diagnosis of ICC
system again.
OK or NG
OK >>
Poor connector connection.

Check connector. Check connector housing for disconnected, loose, bent, and collapsed termi-
nals. If any malfunction is detected, repair as as necessary. Erase DTC and perform ICC sys- 7 - 6 Continuity should not exist.
4 - 3 Continuity should exist.
SKIA6651E
Continuity should exist.
Continuity should exist.
WKIA3403E

ACS-44
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: October 20052005 QX56
5. CHECK ICC BRAKE HOLD RELAY
Disconnect ICC brake hold relay, and check continuity between ICC
brake hold relay terminal 4 and terminal 3.
OK or NG
OK >> GO TO 6.
NG >> Replace ICC brake hold relay. Erase DTC and perform
ICC system running test. Refer to ACS-9, "
ICC System
Running Test" . Then perform self-diagnosis of ICC sys-
tem again.
6. CHECK HARNESS THROUGH ICC BRAKE HOLD RELAY, ICC BRAKE SWITCH, ICC UNIT
1. Disconnect ICC brake hold relay, ECM and ICC unit harness connectors.
2. Check continuity between ICC brake hold relay harness connec-
tor E134 terminal 4 (L) and ICC unit harness connector B17 ter-
minal 29 (BR/W).
3. Check continuity between ICC unit harness connector B17 ter-
minal 29 (BR/W) and ground.
OK or NG
OK >> GO TO 7.
NG >>

Repair harness between ICC brake hold relay and
ICC brake switch.

Repair harness between ICC brake switch and ICC unit.

Erase DTC and perform ICC system running test. Refer to ACS-9, "ICC System Running Test"
. Then perform self-diagnosis of ICC system again.
7. CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between ICC brake hold relay harness connector
E134 terminal 3 (R/B) and ground.
OK or NG
OK >> Replace ICC unit. Refer to ACS-60, "ICC Unit" . Erase
DTC and perform ICC system running test. Refer to
ACS-9, "
ICC System Running Test" . Then perform self-
diagnosis of ICC system again.
NG >>

Check fuse or ICC brake hold relay power supply sys-
tem harness.

Erase DTC and perform ICC system running test. Refer to ACS-9, "ICC System Running Test"
. Then perform self-diagnosis of ICC system again. Continuity should exist.
SKIA6658E
Continuity should exist.
Continuity should not exist.
WKIA1929E
Battery voltage should exist
WKIA3618E

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-45
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8. CHECK STOP LAMP SWITCH
1. Turn ignition switch OFF.
2. Check stop lamp switch. Refer to ACS-59, "
ICC Brake Switch and Stop Lamp Switch" .
OK or NG
OK >> GO TO 9.
NG >> Replace stop lamp switch. Erase DTC and perform ICC system running test. Refer to ACS-9,
"ICC System Running Test" . Then perform self-diagnosis of ICC system again.
9. CHECK ICC BRAKE HOLD RELAY CIRCUIT
1. Disconnect stop lamp switch connector.
2. When brake pedal is not depressed, make sure that stop lamp does not illuminate.
OK or NG
OK >> Replace ICC unit. Refer to ACS-60, "ICC Unit" . Erase DTC and perform ICC system running test.
Refer to ACS-9, "
ICC System Running Test" . Then perform self-diagnosis of ICC system again.
NG >> GO TO 10.
10. CHECK ICC BRAKE HOLD RELAY
1. Disconnect ICC brake hold relay.
2. Check continuity between ICC brake hold relay E134 terminal 7
and terminal 6.
OK or NG
OK >> Replace ICC unit. Refer to ACS-60, "ICC Unit" . Erase
DTC and perform ICC system running test. Refer to
ACS-9, "
ICC System Running Test" . Then perform self-
diagnosis of ICC system again.
NG >> Replace ICC brake hold relay. Erase DTC and perform
ICC system running test. Refer to ACS-9, "
ICC System
Running Test" . Then perform self-diagnosis of ICC system again. Continuity should not exist.
SKIA6659E

ACS-46
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: October 20052005 QX56
11 . CHECK HARNESS THROUGH ICC UNIT, ICC BRAKE HOLD RELAY, AND GROUND
1. Disconnect ICC unit and ICC brake hold relay harness connec-
tors.
2. Check continuity between ICC unit harness connector B17 ter-
minal 47 (BR) and ICC brake hold relay harness connector E134
terminal 1 (BR).
3. Check continuity between ICC unit harness connector B17 ter-
minal 47 (BR) and ground.
4. Check continuity between ICC brake hold relay harness connec-
tor E134 terminal 2 (B) and ground.
OK or NG
OK >> GO TO 12.
NG >>

Repair harness through ICC unit and ICC brake hold
relay, or between ICC brake hold relay and ground.

Erase DTC and perform ICC system running test.
Refer to ACS-9, "
ICC System Running Test" . Then
perform self-diagnosis of ICC system again.
12. CHECK ICC BRAKE HOLD RELAY
Check continuity between ICC brake hold relay terminal 1 and termi-
nal 2.
OK or NG
OK >> GO TO 13.
NG >> Replace ICC brake hold relay. Erase DTC and perform
ICC system running test. Refer to ACS-9, "
ICC System
Running Test" . Then perform self-diagnosis of ICC sys-
tem again.
13. CHECK ICC UNIT STANDARD VOLTAGE
With CONSULT-II
1. Connect connectors of ICC unit and stop lamp switch.
2. While performing active test (STOP LAMP: STP LMP DRIVE
ON) with CONSULT-II, check voltage between ICC unit harness
connector B17 terminal 47 (BR) and ground.
OK or NG
OK >> GO TO 14.
NG >> Replace ICC unit. Refer to ACS-60, "
ICC Unit" . Erase
DTC and perform ICC system running test. Refer to
ACS-9, "
ICC System Running Test" . Then perform self-
diagnosis of ICC system again. 47 - 1 Continuity should exist.
47 - Ground Continuity should not exist.
SKIA6660E
Continuity should exist.
SKIA6661E
Continuity should exist
(minimal resistance through coil will exist)
SKIA6662E
47 - Ground Battery voltage should exist
(during active test)
SKIA3075E

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
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14. CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT
Check voltage between ICC brake hold relay harness connector
E134 terminal 6 (R/Y) and ground.
OK or NG
OK >> GO TO 15.
NG >>

Check fuse or ICC brake hold relay power supply har-
ness.

Erase DTC and perform ICC system running test.
Refer to ACS-9, "
ICC System Running Test" . Then
perform self-diagnosis of ICC system again.
15. CHECK HARNESS BETWEEN ICC BRAKE HOLD RELAY AND ICC UNIT
1. Turn ignition switch OFF.
2. Disconnect ICC brake hold relay and ICC unit harness connec-
tors.
3. Check continuity between ICC brake hold relay harness connec-
tor E134 terminal 7 (R/G) and ICC unit harness connector B17
terminal 38 (R/G).
4. Check continuity between ICC unit harness connector B17 ter-
minal 38 (R/G) and ground.
OK or NG
OK >> GO TO 16.
NG >>

Repair harness between ICC brake hold relay and ICC unit or between ICC brake hold relay
and stop lamp switch.

Erase DTC and perform ICC system running test. Refer to ACS-9, "ICC System Running Test"
. Then perform self-diagnosis of ICC system again.
16. CHECK ICC BRAKE HOLD RELAY
With CONSULT-II
1. Connect ICC unit and ICC brake hold relay harness connectors.
2. Disconnect stop lamp switch connector.
3. Perform active test (STOP LAMP) with CONSULT-II, and make sure that stop lamps are illuminated.
OK or NG
OK >> GO TO 17.
NG >> Replace ICC brake hold relay. Erase DTC and perform ICC system running test. Refer to ACS-9,
"ICC System Running Test" . Then perform self-diagnosis of ICC system again. 6 - Ground Battery voltage should exist
WKIA1931E
7 - 38 Continuity should exist.
38 - Ground Continuity should not exist.
WKIA1932E

INDEX FOR DTC
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INDEX FOR DTCPFP:00024
Alphabetical Index ECS0 0CD H
NOTE:
If DTC U1000 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000. Refer to
AT-9 5, "
DTC U1000 CAN COMMUNICATION LINE" .
*1: These numbers are prescribed by SAE J2012.
*2: These malfunctions cannot be displayed MIL if another malfunction is assigned to MIL.Items
(CONSULT- II screen terms) DTC
Reference page OBD- II Except OBD- II
CONSULT- II GST (*1) CONSULT- II only “A/T”
A/T 1ST E/BRAKING — P1731AT- 1 3 8
ATF PRES SW 1/CIRC — P1841AT- 1 6 0
ATF PRES SW 3/CIRC — P1843AT- 1 6 2
ATF PRES SW 5/CIRC — P1845AT- 1 6 4
ATF PRES SW 6/CIRC — P1846AT- 1 6 6
A/T INTERLOCK P1730 P1730AT- 1 3 5
A/T TCC S/V FNCTN P0744 P0744 AT- 11 7
ATF TEMP SEN/CIRC P0710 P1710AT- 1 2 6
CAN COMM CIRCUIT U1000 U1000AT- 9 5
D/C SOLENOID/CIRC P1762 P1762AT- 1 4 8
D/C SOLENOID FNCTN P1764 (*2 ) P1764 AT- 1 5 0
ENGINE SPEED SIG — P0725AT- 11 3
FR/B SOLENOID/CIRC P1757 P1757AT- 1 4 4
FR/B SOLENOID FNCT P1759 P1759 AT- 1 4 6
HLR/C SOL/CIRC P1767 P1767AT- 1 5 2
HLR/C SOL FNCTN P1769 (*2 ) P1769 AT- 1 5 4
I/C SOLENOID/CIRC P1752 P1752AT- 1 4 0
I/C SOLENOID FNCTN P1754 (*2 ) P1754 AT- 1 4 2
L/PRESS SOL/CIRC P0745 P0745AT- 11 9
LC/B SOLENOID/CIRC P1772 P1772AT- 1 5 6
LC/B SOLENOID FNCT P1774 P1774 AT- 1 5 8
PNP SW/CIRC P0705 P0705AT- 1 0 4
STARTER RELAY/CIRC — P0615AT- 9 9
TCC SOLENOID/CIRC P0740 P0740AT- 11 5
TCM P0700 P0700AT- 1 0 3
TCM·RAM — P1702AT- 1 2 1
TCM·ROM — P1703AT- 1 2 2
TP SEN/CIRC A/T — P1705AT- 1 2 3
TURBINE REV S/CIRC P1716 P1716AT- 1 3 1
VEH SPD SE/CIR·MTR — P1721AT- 1 3 3
VEH SPD SEN/CIR AT P0720 P0720AT- 1 0 8

AT-6
INDEX FOR DTC
Revision: October 20052005 QX56
DTC No. Index ECS00CDI
NOTE:
If DTC U1000 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000. Refer to
AT- 9 5 , "
DTC U1000 CAN COMMUNICATION LINE" .
*1: These numbers are prescribed by SAE J2012.
*2: These malfunctions cannot be displayed MIL if another malfunction is assigned to MIL.DTC
Items
(CONSULT- II screen terms)Reference page OBD- II Except OBD- II
CONSULT- II
GST (*1)C O N S U LT- I I
only “A/T”
— P0615 STARTER RELAY/CIRCAT- 9 9
P0700 P0700 TCMAT- 1 0 3
P0705 P0705 PNP SW/CIRCAT- 1 0 4
P0710 P1710 ATF TEMP SEN/CIRCAT- 1 2 6
P0720 P0720 VEH SPD SEN/CIR ATAT- 1 0 8
— P0725 ENGINE SPEED SIGAT-11 3
P0740 P0740 TCC SOLENOID/CIRCAT-11 5
P0744 P0744 A/T TCC S/V FNCTNAT-11 7
P0745 P0745 L/PRESS SOL/CIRCAT-11 9
— P1702 TCM·RAMAT- 1 2 1
— P1703 TCM·ROMAT- 1 2 2
— P1705 TP SEN/CIRC A/TAT- 1 2 3
P1716 P1716 TURBINE REV S/CIRCAT- 1 3 1
— P1721 VEH SPD SE/CIR·MTRAT- 1 3 3
P1730 P1730 A/T INTERLOCKAT- 1 3 5
— P1731 A/T 1ST E/BRAKINGAT- 1 3 8
P1752 P1752 I/C SOLENOID/CIRCAT- 1 4 0
P1754 (*2 ) P1754 I/C SOLENOID FNCTNAT- 1 4 2
P1757 P1757 FR/B SOLENOID/CIRCAT- 1 4 4
P1759 (*2 ) P1759 FR/B SOLENOID FNCTAT- 1 4 6
P1762 P1762 D/C SOLENOID/CIRCAT- 1 4 8
P1764 (*2 ) P1764 D/C SOLENOID FNCTNAT- 1 5 0
P1767 P1767 HLR/C SOL/CIRCAT- 1 5 2
P1769 P1769 HLR/C SOL FNCTNAT- 1 5 4
P1772 P1772 LC/B SOLENOID/CIRCAT- 1 5 6
P1774 P1774 LC/B SOLENOID FNCTAT- 1 5 8
— P1841 ATF PRES SW 1/CIRCAT- 1 6 0
— P1843 ATF PRES SW 3/CIRCAT- 1 6 2
— P1845 ATF PRES SW 5/CIRCAT- 1 6 4
— P1846 ATF PRES SW 6/CIRCAT- 1 6 6
U1000 U1000 CAN COMM CIRCUITAT- 9 5

A/T CONTROL SYSTEM
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TCM FunctionECS00CDW
The function of the TCM is to:

Receive input signals sent from various switches and sensors.

Determine required line pressure, shifting point, lock-up operation, and engine brake operation.

Send required output signals to the respective solenoids.
CONTROL SYSTEM OUTLINE
The automatic transmission senses vehicle operating conditions through various sensors or signals. It always
controls the optimum shift position and reduces shifting and lock-up shocks.
CONTROL SYSTEM DIAGRAM
SENSORS (or SIGNALS)


TCM


ACTUATORS
PNP switch
Accelerator pedal position sensor
Closed throttle position signal
Wide open throttle position signal
Engine speed signal
A/T fluid temperature sensor
Revolution sensor
Vehicle speed signal
Stop lamp switch signal
Turbine revolution sensor
1st position switch signal
4th position switch signal
ATF pressure switch signal
Tow mode switch signalShift control
Line pressure control
Lock-up control
Engine brake control
Timing control
Fail-safe control
Self-diagnosis
CONSULT-II communication line
Duet-EA control
CAN systemInput clutch solenoid valve
Direct clutch solenoid valve
Front brake solenoid valve
High and low reverse clutch
solenoid valve
Low coast brake solenoid valve
Torque converter clutch solenoid
valve
Line pressure solenoid valve
A/T CHECK indicator lamp
Sta rte r re lay
Back-up lamp relay
SCIA5624E