PDF Service Manual 2003 INFINITI Q45 F50 Series - 2 MB
This is the complete factory service manual for the 2003 INFINITI Q45 F50 series sedan.
It provides dealership-level instructions for every aspect of vehicle maintenance, troubleshooting, and repair.
With detailed specifications, wiring diagrams, and step-by-step procedures, this manual is indispensable for professional technicians and experienced DIY owners.
Ensure your luxury vehicle receives the best care with this comprehensive guide.
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--- Page 1 ---
Edition: August 2002 QUICK REFERENCE INDEX
A GENERAL INFORMATION GI General Information
Revision: April 2004
Publication No. SM3E-1F50U4 B ENGINE EM
LU
Engine Mechanical
Engine Lubrication System
A
CO
EC
FL
Engine Cooling System
Engine Control System
Fuel System
B
C TRANSMISSION/
EX
ACC
AT
Exhaust System
Accelerator Control System
Automatic Transmission
C
TRANSAXLE
D DRIVELINE/AXLE PR
RFD
Propeller Shaft
Rear Final Drive
D
FAX Front Axle
E SUSPENSION
RAX
FSU
Rear Axle
Front Suspension
E
F
RSU Rear Suspension
WT Road Wheels & Tires
SCS Suspension Control System
F BRAKES BR
PB
BRC
Brake System
Parking Brake System
Brake Control System
G
G STEERING
H RESTRAINTS
PS
STC
SB
Power Steering System
Steering Control System
Seat Belts
H
I BODY
SRS
BL
Supplemental Restraint System
(SRS)
Body, Lock & Security System
I
GW Glasses, Window System & Mir-
RF
rors
Roof
J
EI Exterior & Interior
IP
SE
Instrument Panel
Seat
K
J AIR CONDITIONER ATC Automatic Air Conditioner
K ELECTRICAL SC
LT
Starting & Charging System
Lighting System
L
DI Driver Information System
WW
LAN
Wiper, Washer & Horn
LAN System
M
AV Audio, Visual,Navigation & Tele-
phone System
ACS Auto Cruise Control System
PG Power Supply, Ground & Circuit Ele-
ments
L MAINTENANCE MA Maintenance
M INDEX IDX Alphabetical Index
All rights reserved. No part of this Service Manual may be reproduced or stored in a retrieval system, or
transmitted in any form, or by any means, electronic, mechanical, recording or otherwise, without the prior
written permission of Nissan Motor Company Ltd., Tokyo, Japan.
--- Page 3 ---
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
[ASCD]
ASCD PUMP CIRCUIT CHECK
1. CHECK ASCD PUMP
1. Disconnect ASCD pump connector.
2. Measure resistance between ASCD pump terminals 1 and 2, 3, 4.
Terminals Resistance [Ω]
2 Approx. 65
1 3 Approx. 65
4 Approx. 3
PBIC0214E
Refer to wiring diagram in ACS-11, "FIG. 4" .
OK or NG
OK >> GO TO 2.
NG >> Replace ASCD pump.
2. CHECK ASCD PUMP CIRCUIT
1. Disconnect ASCD control unit harness connector.
2. Check harness for open or short between ASCD control unit and ASCD pump.
Terminal (Wire color)
Circuit
ASCD control unit ASCD pump
ASCD pump power supply 12 (R/L) 1 (R/L)
Air valve 13 (L/R) 2 (L/R)
Release valve 1 (L/Y) 3 (L/Y)
Vacuum motor 14 (W/R) 4 (W/R)
Continuity should exist.
OK or NG PBIC0215E
OK >> GO TO 3.
NG >> Repair harness or connector.
Revision; 2004 April ACS-24 2003 Q45
--- Page 4 ---
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
[ICC]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION PFP:00004
A
Work Flow EKS003RG
B
C
D
E
F
G
H
I
J
ACS
L
M
SKIA1227E
● Reference 1··· Refer to ACS-62, "Self-Diagnostic Function" .
● Reference 2··· Refer to ACS-67, "Diagnostic Trouble Code (DTC) Chart" .
● Reference 3··· Refer to ACS-91, "Symptom Chart" .
● Reference 4···Refer to ACS-64, "SELF-DIAGNOSIS BY CONSULT-II WILL NOT RUN" /ACS-65, "SELF-
DIAGNOSIS BY ICC SYSTEM DISPLAY WILL NOT RUN." .
Revision; 2004 April ACS-57 2003 Q45
--- Page 5 ---
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
[ICC]
DTC 109 LASER HIGH TEMP EKS003PZ
1. CHECK SYMPTOM
● Is cooling system malfunctioning?
Yes or No
Yes >> ● Repair cooling system.
● After that, Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC
system again.
No >> ● Replace ICC sensor, and adjust laser beam aiming.
● After repair, Erase DTC. Then perform ICC system running test, and perform self-diagnosis of
ICC unit.
Revision; 2004 April ACS-90 2003 Q45
--- Page 6 ---
A/T CONTROL SYSTEM
Shift Mechanism ECS0082P
A
The automatic transmission uses compact dual planetary gear systems to improve power-transmission effi-
ciency, simplify construction and reduce weight.
It also employs an optimum shift control and super wide gear ratios. They improve starting performance and
acceleration during medium and high-speed operation. B
CONSTRUCTION
AT
D
E
F
G
H
PCIA0002J
1. Front brake 2. Input clutch 3. Direct clutch
4. High and low reverse clutch 5. Reverse brake 6. Forward brake
I
7. Low coast brake 8. 1st one-way clutch 9. Forward one-way clutch
10. 3rd one-way clutch 11. Front sun gear 12. Input shaft
J
13. Mid internal gear 14. Front internal gear 15. Rear carrier
16. Rear sun gear 17. Mid sun gear 18. Front carrier
19. Mid carrier 20. Rear internal gear 21. Output shaft
K
22. Parking gear 23. Parking pawl
FUNCTION OF CLUTCH AND BRAKE
Name of the Part Abbreviation Function L
Front brake (1) Fr/B Fastens the front sun gear (11).
Connects the input shaft (12), the front internal gear (14) and the mid internal
Input clutch (2) I/C
gear (13).
M
Direct clutch (3) D/C Connects the rear carrier (15) and the rear sun gear (16).
High and low reverse clutch (4) H&LR/C Connects the mid sun gear (17) and the rear sun gear (16).
Reverse brake (5) R/B Fastens the rear carrier (15).
Forward brake (6) F/B Fastens the mid sun gear (17).
Low coast brake (7) LC/B Fastens the mid sun gear (17).
Allows the rear sun gear (16) to turn freely forward relative to the mid sun gear
1st one-way clutch (8) 1st/O.C
(17) but fastens it for reverse rotation.
Allows the mid sun gear (17) to turn freely in the forward direction but fastens it
Forward one-way clutch (9) F/O.C
for reverse rotation.
Allows the front sun gear (11) to turn freely in the forward direction but fastens
3rd one-way clutch (10) 3rd/O.C
it for reverse rotation.
Revision; 2004 April AT-17 2003 Q45
--- Page 7 ---
TROUBLE DIAGNOSIS
Circuit Diagram ECS00837
TCWM0051E
Revision; 2004 April AT-50 2003 Q45
--- Page 8 ---
TROUBLE DIAGNOSIS
Symptom Condition Diagnostic Item Reference page
A
Engine does not 1. Ignition switch and starter PG-2, SC-22
start in “N” or “P”
2. Control linkage adjustment AT-283
position.
Refer to AT-240, ON vehicle B
"Engine Cannot Be
3. PNP switch AT-106
Started In “P” or “N”
Position" .
1. Ignition switch and starter PG-2, SC-22
AT
Engine starts in
positions other than ON vehicle 2. Control linkage adjustment AT-283
“N” or “P”.
3. PNP switch AT-106 D
1. Fluid level and state AT-51
2. Engine speed signal AT-116
3. Turbine revolution sensor AT-153 E
ON vehicle
4. Torque converter clutch solenoid valve AT-118
Engine stall.
5. CAN communication line AT-100
F
6. Control valve assembly AT-290
7. Torque converter (ATF condition “NG” only. Refer to AT-51, "Fluid Con-
OFF vehicle AT-308
dition Check" .)
G
1. Fluid level and state AT-51
2. Engine speed signal AT-116
3. Turbine revolution sensor AT-153 H
Engine stalls when ON vehicle
4. Torque converter clutch solenoid valve AT-118
select lever shifted
“N” → “D”, “R”. 5. CAN communication line AT-100
I
6. Control valve assembly AT-290
7. Torque converter (ATF condition “NG” only. Refer to AT-51, "Fluid Con-
OFF vehicle AT-308
dition Check" .)
J
1. Fluid level and state AT-51
2. ATF pressure switch 5 and direct clutch solenoid valve AT-228, AT-189
3. ATF pressure switch 1 and front brake solenoid valve AT-220, AT-180 K
Engine speed does ON vehicle 4. Accelerator pedal position sensor AT-145
not return to idle.
5. Vehicle speed sensor A/T and vehicle speed sensor MTR AT-111, AT-158
Refer to AT-269, L
"Engine Speed 6. CAN communication line AT-100
Does Not Return To
7. Control valve assembly AT-290
Idle" .
8. Front brake [brake band (ATF condition “NG” only. Refer to AT-51, M
AT-308
"Fluid Condition Check" .)]
OFF vehicle
9. Direct clutch (ATF condition “NG” only. Refer to AT-51, "Fluid Condition
AT-338
Check" .)
*: Parts behind Drum Support is impossible to perform inspection by disassembly.
Revision; 2004 April AT-83 2003 Q45
--- Page 9 ---
DTC P0725 ENGINE SPEED SIGNAL
DTC P0725 ENGINE SPEED SIGNAL PFP:24825
Description ECS0084A
The engine speed signal is sent from the ECM to the TCM.
On Board Diagnosis Logic ECS0084B
● This is not an OBD-II self-diagnostic item.
● Diagnostic trouble code “ENGINE SPEED SIG” with CONSULT-II or 16th judgement flicker without CON-
SULT-II is detected when TCM does not receive the ignition signal from ECM during engine cranking or
running.
Possible Cause ECS0084C
Harness or connectors
(The ECM to the TCM circuit is open or shorted.)
DTC Confirmation Procedure ECS0084D
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF”
and wait at least 10 seconds before conducting the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch to “ON” position and select “DATA MONI-
TOR” mode for “A/T” with CONSULT-II.
2. Start engine and maintain the following conditions for at least 10
consecutive seconds.
VHCL SPEED SE: 10 km/h (6 MPH) or more
ACCELE POSI: More than 1/8
Selector lever: “D” position
3. If DTC is detected, go to AT-116, "Diagnostic Procedure" .
SAT014K
Diagnostic Procedure ECS0084E
1. CHECK DTC WITH ECM
With CONSULT-II
1. Turn ignition switch to “ON” position. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode for “ENGINE” with CON-
SULT-II. Refer to EC-108, "CONSULT-II Function" .
OK or NG
OK >> GO TO 2.
NG >> Check the DTC detected item, go to EC-108, "CON-
SULT-II Function" .
● If CAN communication line is detected, go to AT-100,
"DTC U1000 CAN COMMUNICATION LINE" .
SAT014K
Revision; 2004 April AT-116 2003 Q45
--- Page 10 ---
DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT
Diagnostic Procedure ECS0085V
1. CHECK INPUT SIGNALS (WITH CONSULT-II) A
With CONSULT-II
1. Start engine. B
2. Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for
“A/T” with CONSULT-II.
3. Read out the value of “ATF TEMP SE 1” or “ATF TEMP SE 2”. AT
Item name Condition °C (°F) Display value (Approx.) V
Fluid temperature
2.2 - 1.8 - 0.6
D
sensor 1
0 (32) - 20 (68) - 80 (176)
Fluid temperature
2.2 - 1.7 - 0.45
sensor 2 E
PCIA0039E
OK or NG
OK >> GO TO 7.
NG >> GO TO 3. F
2. CHECK INPUT SIGNALS (WITHOUT CONSULT-II)
G
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM connector and ground while warming up A/T. Refer to AT-148, "Wiring Dia- H
gram — AT — FTS" .
Connector Temperature Voltage (V)
Name Terminal No.
No. °C (°F) (Approx.) I
0 (32) 2.2
8 (B/R) - 5 (B), 14
Fluid tempera-
(B), 24 (B) or 46 (B) 20 (68) 1.8
ture sensor 1
(ground)
80 (176) 0.6
J
F103
0 (32) 2.2
17 (Y/B) - 5 (B), 14
Fluid tempera-
(B), 24 (B) or 46 (B) 20 (68) 1.7
ture sensor 2 K
(ground)
80 (176) 0.45
SCIA1162E
3. Turn ignition switch to “OFF” position.
4. Disconnect the TCM connector. L
5. Check if there is continuity between the connector terminal and ground.
OK or NG
M
OK >> GO TO 7.
NG >> GO TO 3.
Revision; 2004 April AT-149 2003 Q45
--- Page 11 ---
DTC P1757 FRONT BRAKE SOLENOID VALVE
Diagnostic Procedure ECS00871
1. CHECK FRONT BRAKE SOLENOID VALVE CIRCUIT
1. Turn ignition switch to “OFF” position.
2. Disconnect A/T unit assembly harness connector at the trans-
mission right side.
3. Check the resistance between terminal and ground.
Terminal No.
Solenoid valve Connector No. Resistance (Approx.)
(Wire color)
Front brake solenoid
F27 5 (R) - Ground 3-9Ω
valve
OK or NG
OK >> GO TO 4. SCIA1839E
NG >> GO TO 2.
2. CHECK TERMINAL CORD ASSEMBLY
1. Remove oil pan. Refer to AT-290, "Control Valve Assembly" .
2. Disconnect A/T unit assembly harness connector and control valve assembly harness connector.
3. Check continuity between A/T unit assembly harness connector
and control valve assembly harness connector.
Item Connector No. Terminal No. (Wire color) Continuity
A/T unit assembly
F27 5 (W/R)
harness connector
Control valve assem- Yes
bly harness connec- F301 8 (W/R)
tor
4. If OK, check harness for short to ground and short to power.
OK or NG SCIA3076E
OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
3. CHECK VALVE RESISTANCE
Check valve resistance
● Refer to AT-184, "Component Inspection" .
OK or NG
OK >> GO TO 4.
NG >> Replace the control valve assembly. Refer to AT-290, "Control Valve Assembly" .
Revision; 2004 April AT-182 2003 Q45
--- Page 12 ---
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
3. CHECK TERMINAL CORD ASSEMBLY A
1. Remove oil pan. Refer to AT-290, "Control Valve Assembly" .
2. Disconnect A/T unit assembly harness connector and control valve assembly harness connector.
3. Check continuity between A/T unit assembly harness connector B
and control valve assembly harness connector.
Item Connector No. Terminal No. (Wire color) Continuity
AT
A/T unit assembly
F26 2 (R)
harness connector
Control valve assem- Yes
D
bly harness connec- F302 10 (R)
tor
A/T unit assembly
F26 5 (L) E
harness connector
Control valve assem- Yes
bly harness connec- F302 13 (L)
tor F
A/T unit assembly
F27 2 (B/R)
harness connector
Control valve assem- Yes G
bly harness connec- F301 4 (B/R)
tor
4. If OK, check harness for short to ground and short to power. H
5. Reinstall any part removed.
SCIA3096E
OK or NG