2007 NISSAN 350Z brake sensor

DTC P1772 LOW COAST BRAKE SOLENOID VALVE
AT-153
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Revision: 2006 November2007 350Z
DTC P1772 LOW COAST BRAKE SOLENOID VALVEPFP:31940
DescriptionNCS0006O
Low coast brake solenoid valve is turned ON or OFF 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-III Reference ValueNCS0006P
On Board Diagnosis LogicNCS0006Q

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P1772 LC/B SOLENOID/CIRC” with CONSULT-III or 7th judgment flicker without
CONSULT-III is detected when TCM detects an improper voltage drop when it tries to operate the sole-
noid valve.
Possible CauseNCS0006R

Harness or connectors
(Solenoid circuit is open or shorted.)

Low coast brake solenoid valve
DTC Confirmation ProcedureNCS0006S
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-III
1. Turn ignition switch ON.
2. Select “SELECTION FROM MENU” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III
and check monitor “MANU MODE SW” and “GEAR”.
3. Touch “START”.
4. Start engine.
5. Drive vehicle and maintain the following conditions for at least 5 consecutive seconds.
MANU MODE SW: ON
GEAR: “1” or “2” (LC/B ON/OFF)
6. If DTC is detected, go to AT- 1 5 4 , "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-III”.
Item name Condition Display value
ON OFF SOLLow coast brake engaged. Refer to AT- 1 9
.ON
Low coast brake disengaged. Refer to AT- 1 9
.OFF

AT-154
DTC P1772 LOW COAST BRAKE SOLENOID VALVE
Revision: 2006 November2007 350Z
Diagnostic ProcedureNCS0006T
1. CHECK INPUT SIGNAL
With CONSULT-III
1. Turn ignition switch ON.
2. Select “SELECTION FROM MENU” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start engine.
4. Read out the value of “ON OFF SOL” while driving.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to AT- 1 6 2 , "
MAIN POWER SUPPLY AND GROUND CIR-
CUIT" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. DETECT MALFUNCTIONING ITEM
Check A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> Replace control valve with TCM. Refer to AT- 2 1 5 , "Control Valve with TCM and A/T Fluid Temper-
ature Sensor 2" .
NG >> Repair or replace damaged parts.
4. CHECK DTC
Perform AT- 1 5 3 , "
DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
Item name Condition Display value
ON OFF SOLLow coast brake engaged. Refer to AT- 1 9
.ON
Low coast brake disengaged. Refer to AT- 1 9
.OFF

DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
AT-155
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Revision: 2006 November2007 350Z
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTIONPFP:31940
DescriptionNCS0006U

Low coast brake solenoid valve is turned ON or OFF 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.

This is not only caused by electrical malfunction (circuits open or shorted) but also by mechanical mal-
function such as control valve sticking, improper solenoid valve operation.
CONSULT-III Reference ValueNCS0006V
On Board Diagnosis LogicNCS0006W

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P1774 LC/B SOLENOID FNCT” with CONSULT-III or 7th judgment flicker with-
out CONSULT-III is detected under the following conditions.
–When TCM detects that actual gear ratio is irregular, and relation between gear position and condition of
ATF pressure switch 2 is irregular during depressing accelerator pedal (Other than during shift change)
–When TCM detects that relation between gear position and condition of ATF pressure switch 2 is irregular
during releasing accelerator pedal (Other than during shift change)
Possible CauseNCS0006X

Harness or connectors
(The solenoid and switch circuits are open or shorted.)

Low coast brake solenoid valve

ATF pressure switch 2
DTC Confirmation ProcedureNCS0006Y
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-III
1. Start engine.
2. Accelerate vehicle to maintain the following conditions.
MANU MODE SW: ON
GEAR: “1” or “2” (LC/B ON/OFF)
3. Perform step 2 again.
4. Turn ignition switch OFF, then perform step 1 to 3 again.
5. Check “SELF-DIAG RESULTS” mode for “TRANSMISSION” with CONSULT-III.
If DTC (P1774) is detected, refer to AT- 1 5 6 , "
Diagnostic Procedure" .
If DTC (P1772) is detected, go to AT- 1 5 4 , "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-III”.
Item name Condition Display value
ON OFF SOLLow coast brake engaged. Refer to AT- 1 9
.ON
Low coast brake disengaged. Refer to AT- 1 9
.OFF
ATF PRES SW 2Low coast brake engaged. Refer to AT- 1 9
.ON
Low coast brake disengaged. Refer to AT- 1 9
.OFF

AT-156
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
Revision: 2006 November2007 350Z
Diagnostic ProcedureNCS0006Z
1. CHECK INPUT SIGNALS
With CONSULT-III
1. Start engine.
2. Select “SELECTION FROM MENU” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Drive vehicle in the manual mode (“1” or “2” gear), and confirm the ON/OFF actuation of the “ATF PRES
SW 2” and “ON OFF SOL”.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to AT- 1 6 2 , "
MAIN POWER SUPPLY AND GROUND CIR-
CUIT" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. DETECT MALFUNCTIONING ITEM
Check A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> Replace control valve with TCM. Refer to AT- 2 1 5 , "Control Valve with TCM and A/T Fluid Temper-
ature Sensor 2" .
NG >> Repair or replace damaged parts.
4. CHECK DTC
Perform AT- 1 5 5 , "
DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
Item name Condition Display value
ON OFF SOLLow coast brake engaged. Refer to AT- 1 9
.ON
Low coast brake disengaged. Refer to AT- 1 9
.OFF
ATF PRES SW 2Low coast brake engaged. Refer to AT- 1 9
.ON
Low coast brake disengaged. Refer to AT- 1 9
.OFF

DISASSEMBLY
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Revision: 2006 November2007 350Z
50. Remove seal rings from output shaft.
51. Remove needle bearing from transmission case.
52. Remove revolution sensor from transmission case.
CAUTION:

Do not subject it to impact by dropping or hitting it.

Do not disassemble.

Do not allow metal filings, etc. to get on the sensor's front
edge magnetic area.

Do not place in an area affected by magnetism.
53. Remove reverse brake snap ring (fixing plate) using 2 flat-
bladed screwdrivers.
NOTE:
Press out snap ring from transmission case oil pan side gap
using a flat-bladed screwdriver, and remove it using another
screwdriver.
54. Remove reverse brake retaining plate from transmission case.

Check facing for burns, cracks or damage. If necessary,
replace the plate.
55. Remove N-spring from transmission case.
SCIA5209E
SCIA5031E
SCIA2320E
SCIA5032E
SCIA5214E

ASSEMBLY
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Revision: 2006 November2007 350Z
22. Measure clearance between retaining plate and snap ring. If not
within specified clearance, select proper retaining plate. Refer to
“Parts Information” for retaining plate selection.
23. Install needle bearing to transmission case.
CAUTION:

Take care with the direction of needle bearing. Refer to
AT- 2 5 3 , "
Locations of Adjusting Shims, Needle Bearings,
Thrust Washers and Snap Rings" .

Apply petroleum jelly to needle bearing.
24. Install revolution sensor to transmission case, and then tighten
mounting bolt to the specified torque. Refer to AT- 2 4 6 , "
Compo-
nents" .
CAUTION:

Do not subject it to impact by dropping or hitting it.

Do not disassemble.

Do not allow metal filings, etc. to get on the sensor's front
edge magnetic area.

Do not place in an area affected by magnetism.
25. As shown in the figure, drive rear oil seal into rear extension until
it is flush using a drift.
CAUTION:

Do not reuse rear oil seal.

Apply ATF to rear oil seal.
26. Install return spring (1) to parking pawl (2).Specified clearance “A”:
Refer to AT- 3 1 2 , "
Reverse Brake" .
SCIA3129E
SCIA5031E
SCIA2320E
SCIA5311E
SCIA6180J

AT-306
ASSEMBLY
Revision: 2006 November2007 350Z
8. Make sure that brake band does not close turbine revolution
sensor hole.
9. Install control valve with TCM.
a. Connect TCM connector and park/neutral position switch con-
nector.
b. Install A/T assembly harness connector from control valve with
TCM.
c. Connect TCM connectors.
d. Install O-ring to A/T assembly harness connector.
CAUTION:

Do not reuse O-ring.

Apply ATF to O-ring.
SCIA5034E
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SCIA5450E
SCIA5447E
SCIA5155E

AT-312
SERVICE DATA AND SPECIFICATIONS (SDS)
Revision: 2006 November2007 350Z
A/T Fluid Temperature SensorNCS0009Q
Turbine Revolution SensorNCS0009R
Vehicle Speed Sensor A/T (Revolution Sensor)NCS0009S
Reverse BrakeNCS0009T
Total End PlayNCS0009U
Name Condition CONSULT-III “DATA MONITOR” (Approx.) Resistance (Approx.)
A/T fluid temperature sensor 10°C (32°F) 3.3 V 15 kΩ
20°C (68°F) 2.7 V 6.5 kΩ
80°C (176°F) 0.9 V 0.9 kΩ
A/T fluid temperature sensor 20°C (32°F) 3.3 V 10 kΩ
20°C (68°F) 2.5V 4kΩ
80°C (176°F) 0.7 V 0.5 kΩ
Name Condition Data (Approx.)
Turbine revolution sensor 1When running at 50 km/h (31 MPH) in 4th speed with the closed throttle
position signal OFF.
1.3 kHz
Turbine revolution sensor 2When moving at 20 km/h (12 MPH) in 1st speed with the closed throttle posi-
tion signal OFF.
Name Condition Data (Approx.)
Revolution sensor When moving at 20 km/h (12 MPH). 185 Hz
Model code number98X5B
Number of drive plates6
Number of driven plates6
Clearance mm (in) Standard 0.7 – 1.1 (0.028 – 0.043)
Total end play mm (in) 0.25 – 0.55 (0.0098 – 0.0217)