2004 INFINITI QX56 Factory Service Manual

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Page 209 of 3371

INFINITI QX56 2004 Factory Service Manual AT-138
DTC P1721 VEHICLE SPEED SENSOR MTR
Revision: August 20072004 QX56
7. DETECT MALFUNCTIONING ITEM
Check the following items:
Power supply and ground circuit for TCM.
The A/T assembly harness co

Page 210 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1730 A/T INTERLOCK
AT-139
D
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AT
Revision: August 20072004 QX56
DTC P1730 A/T INTERLOCKPFP:00000
DescriptionUCS002FO
Fail-safe function to detect interlock conditions.
On Boar

Page 211 of 3371

INFINITI QX56 2004 Factory Service Manual AT-140
DTC P1730 A/T INTERLOCK
Revision: August 20072004 QX56
Judgement of A/T InterlockUCS002FS
When A/T Interlock is judged to be malfunctioning, the vehicle should be fixed in 2nd gear, and should

Page 212 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1730 A/T INTERLOCK
AT-141
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AT
Revision: August 20072004 QX56
4. DETECT MALFUNCTIONING ITEM
Check the following items:
Power supply and ground circuit for TCM.
The A/T asse

Page 213 of 3371

INFINITI QX56 2004 Factory Service Manual AT-142
DTC P1731 A/T 1ST ENGINE BRAKING
Revision: August 20072004 QX56
DTC P1731 A/T 1ST ENGINE BRAKINGPFP:00000
DescriptionUCS002FU
Fail-safe function to prevent sudden decrease in speed by engine br

Page 214 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1731 A/T 1ST ENGINE BRAKING
AT-143
D
E
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Revision: August 20072004 QX56
Diagnostic ProcedureUCS002FZ
1. CHECK INPUT SIGNALS
With CONSULT-II
1. Start the engine.
2. Select “

Page 215 of 3371

INFINITI QX56 2004 Factory Service Manual AT-144
DTC P1731 A/T 1ST ENGINE BRAKING
Revision: August 20072004 QX56
6. CHECK DTC
Perform “DTC Confirmation Procedure”.
Refer to AT-142, "DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION

Page 216 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1752 INPUT CLUTCH SOLENOID VALVE
AT-145
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Revision: August 20072004 QX56
DTC P1752 INPUT CLUTCH SOLENOID VALVEPFP:31940
DescriptionUCS002G0
Input clutch solenoid valve is

DTC P1752 INPUT CLUTCH SOLENOID VALVE
AT-145
D
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Revision: August 20072004 QX56
DTC P1752 INPUT CLUTCH SOLENOID VALVEPFP:31940
DescriptionUCS002G0
Input clutch solenoid valve is controlled by the TCM in response to signals sent from the PNP switch, vehicle
speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then be shifted to the
optimum position.
CONSULT-II Reference ValueUCS002G1
On Board Diagnosis LogicUCS002G2
This is an OBD-II self-diagnostic item.
Diagnostic trouble code “I/C SOLENOID/CIRC” with CONSULT-II or P1752 without CONSULT-II is
detected under the following conditions.
–When TCM detects an improper voltage drop when it tries to operate the solenoid valve.
–When TCM detects as irregular by comparing target value with monitor value.
Possible CauseUCS002G3
Harness or connectors
(The solenoid circuit is open or shorted.)
Input clutch solenoid valve
DTC Confirmation ProcedureUCS002G4
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Start engine.
4. Drive vehicle and maintain the following conditions for at least 5
consecutive seconds.
ACCELE POS: 1.5/8 - 2.0/8
Selector lever: “D” position
Gear position: 3rd
4th Gear (I/C ON/OFF)
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
5. If DTC is detected go to AT- 1 4 6 , "
Diagnostic Procedure" .
WITH GST
Follow the procedure “With CONSULT-II”.
Item name Condition Display value (Approx) (A)
I/C SOLENOIDInput clutch disengaged. Refer to AT- 2 1
. 0.6 - 0.8
Input clutch engaged. Refer to AT- 2 1
. 0 - 0.05
BCIA0030E

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