2010 INFINITI QX56 engine oil

P0745 PRESSURE CONTROL SOLENOID ATM-69
< COMPONENT DIAGNOSIS >
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P0745 PRESSURE CONTROL SOLENOID A
DescriptionINFOID:0000000005148605
The line pressure solenoid valve regulates the oil pum p discharge pressure to suit the driving condition in
response to a signal sent from the TCM.
The line pressure duty cycle value is not consistent when the closed throttle position signal is “ON”.
To confirm the line pressure duty cycle at low pressu re, the accelerator (throttle) should be open until
the closed throttle posi tion signal is “OFF”.
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000005148606
On Board Diagnosis LogicINFOID:0000000005148607
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0745 PC SOLENOID A” with CONSULT-III is detected under the following condi-
tions.
- 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 CauseINFOID:0000000005148608
• Harness or connectors (The solenoid circuit is open or shorted.)
• Line pressure solenoid valve
DTC Confirmation ProcedureINFOID:0000000005148609
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” and select “DATA MONITOR” mode for “ENGINE” with CONSULT-III.
2. Engine start and wait at least 5 second.
3. If DTC is detected, go to TM-69, "
Diagnosis Procedure".
WITH GST
Follow the procedure “With CONSULT-III”.
Diagnosis ProcedureINFOID:0000000005148610
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Turn ignition switch “ON”.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start the engine.
4. Read out the value of “LINE PRES SOL” while driving.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
Item name Condition Display value (Approx.)
LINE PRES SOL During driving 0.2 - 0.6 A
Item nameCondition Display value (Approx.)
LINE PRES SOL During driving 0.2 - 0.6 A
Revision: April 20092010 QX56

TM-128
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
22Slips/Will
Not En-
gage When “D” position, re-
mains in 5GR.
ON vehicle1. Fluid level and state
TM-148
2. Output speed sensor and vehicle speed signal TM-50,
TM-76
3. Front brake solenoid valve TM-84
4. Line pressure testTM-157
5. CAN communication line LAN-4
6. Control valve with TCMTM-172
OFF vehicle7. Front brake (brake band)
TM-1728. Input clutchTM-172
9. Gear systemTM-172
10. High and low reverse clutchTM-172
23Vehicle cannot be
started from D1.ON vehicle
1. Fluid level and state
TM-148
2. Accelerator pedal position sensor TM-71
3. Line pressure testTM-157
4. CAN communication line LAN-4
5. Control valve with TCMTM-172
OFF vehicle6. Torque converter
TM-172
7. Oil pump assemblyTM-223
8. 3rd one-way clutchTM-172
9. 1st one-way clutchTM-232
10. Gear systemTM-172
11. Reverse brakeTM-172
12. Forward one-way clutch (Parts behind drum support is im-
possible to perform inspection by disassembly. Refer to TM-
8, TM-9. TM-172
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
TM-8
, TM-9. TM-172
24
Does not lock-up. ON vehicle1. Fluid level and state
TM-148
2. Line pressure testTM-157
3. Engine speed signal TM-53
4. Input speed sensorTM-48
5. Torque converter clutch solenoid valveTM-65
6. CAN communication line LAN-4
7. Control valve with TCMTM-172
OFF vehicle8. Torque converter
TM-1729. Oil pump assemblyTM-172
No. ItemsSymptom Condition Diagnostic ItemReference
page
Revision: April 20092010 QX56

SYSTEM SYMPTOMTM-129
< SYMPTOM DIAGNOSIS >
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25
Slips/Will
Not en-
gage Does not hold lock-up
condition.
ON vehicle1. Fluid level and state
TM-148
2. Line pressure testTM-157
3. Engine speed signal TM-53
4. Input speed sensorTM-48
5. Torque converter clutch solenoid valveTM-65
6. CAN communication line LAN-4
7. Control valve with TCMTM-172
OFF vehicle8. Torque converter
TM-1729. Oil pump assemblyTM-172
26Lock-up is not re-
leased. ON vehicle1. Fluid level and state
TM-148
2. Line pressure testTM-157
3. Engine speed signal TM-53
4. Input speed sensorTM-48
5. Torque converter clutch solenoid valveTM-65
6. CAN communication line LAN-4
7. Control valve with TCMTM-172
OFF vehicle8. Torque converter
TM-1729. Oil pump assemblyTM-172
27No shock at all or the
clutch slips when vehi-
cle changes speed D1
→
D2. ON vehicle
1. Fluid level and state
TM-148
2. Output speed sensor and vehicle speed signal TM-50,
TM-76
3. Direct clutch solenoid valve TM-86
4. CAN communication line LAN-4
5. Line pressure testTM-157
6. Control valve with TCMTM-172
OFF vehicle7. Torque converter
TM-172
8. Oil pump assemblyTM-172
9. 3rd one-way clutchTM-172
10. Gear systemTM-172
11. Direct clutchTM-172
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to TM-8
, TM-9. TM-172
No. Items
Symptom Condition Diagnostic ItemReference
page
Revision: April 20092010 QX56

SYSTEM SYMPTOMTM-131
< SYMPTOM DIAGNOSIS >
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Slips/Will
Not en-
gage No shock at all or the
clutch slips when vehi-
cle changes speed D4
→
D5. ON vehicle
1. Fluid level and state
TM-148
2. Output speed sensor and vehicle speed signal TM-50,
TM-76
3. Front brake solenoid valve TM-84
4. Direct clutch solenoid valveTM-86
5. CAN communication line LAN-4
6. Line pressure testTM-157
7. Control valve with TCMTM-172
OFF vehicle8. Torque converter
TM-172
9. Oil pump assemblyTM-172
10. Front brake (brake band)TM-172
11. Input clutchTM-172
12. Gear systemTM-172
13. High and low reverse clutchTM-172
31When you press the
accelerator pedal and
shift speed D5→ D4
the engine idles or the
transmission slips. ON vehicle
1. Fluid level and state
TM-148
2. Output speed sensor and vehicle speed signal TM-50,
TM-76
3. Front brake solenoid valve TM-84
4. Direct clutch solenoid valveTM-86
5. CAN communication line LAN-4
6. Line pressure testTM-157
7. Control valve with TCMTM-172
OFF vehicle8. Torque converter
TM-172
9. Oil pump assemblyTM-172
10. Input clutchTM-172
11. Gear systemTM-172
12. High and low reverse clutchTM-172
13. Direct clutchTM-172
No. ItemsSymptom Condition Diagnostic ItemReference
page
Revision: April 20092010 QX56

TM-132
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
32Slips/Will
Not en-
gage When you press the
accelerator pedal and
shift speed D4→ D3
the engine idles or the
transmission slips. ON vehicle
1. Fluid level and state
TM-148
2. Output speed sensor and vehicle speed signal TM-50,
TM-76
3. Input clutch solenoid valve TM-82
4. Front brake solenoid valveTM-84
5. CAN communication line LAN-4
6. Line pressure testTM-157
7. Control valve with TCMTM-172
OFF vehicle8. Torque converter
TM-172
9. Oil pump assemblyTM-172
10. 3rd one-way clutchTM-172
11. Gear systemTM-172
12. High and low reverse clutchTM-172
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
TM-8
, TM-9. TM-172
14. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
TM-8
, TM-9. TM-172
33 When you press the
accelerator pedal and
shift speed D3→ D2
the engine idles or the
transmission slips. ON vehicle
1. Fluid level and state
TM-148
2. Output speed sensor and vehicle speed signal TM-50,
TM-76
3. High and low reverse clutch solenoid valve TM-88
4. Direct clutch solenoid valveTM-86
5. CAN communication line LAN-4
6. Line pressure testTM-157
7. Control valve with TCMTM-172
OFF vehicle8. Torque converter
TM-172
9. Oil pump assemblyTM-172
10. 3rd one-way clutchTM-172
11. Gear systemTM-172
12. Direct clutchTM-172
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to TM-8
, TM-9. TM-172
No. Items
Symptom Condition Diagnostic ItemReference
page
Revision: April 20092010 QX56

SYSTEM SYMPTOMTM-133
< SYMPTOM DIAGNOSIS >
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34
Slips/Will
Not En-
gage When you press the
accelerator pedal and
shift speed D2→ D1
the engine idles or the
transmission slips. ON vehicle
1. Fluid level and state
TM-148
2. Output speed sensor and vehicle speed signal TM-50,
TM-76
3. Direct clutch solenoid valve TM-86
4. CAN communication line LAN-4
5. Line pressure testTM-157
6. Control valve with TCMTM-172
OFF vehicle7. Torque converter
TM-172
8. Oil pump assemblyTM-172
9. 3rd one-way clutchTM-172
10. 1st one-way clutchTM-172
11. Gear systemTM-172
12. Reverse brakeTM-172
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
TM-8
, TM-9.TM-172
14. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
TM-8
, TM-9. TM-172
35 With selector lever in
“D” position, accelera-
tion is extremely poor. ON vehicle
1. Fluid level and state
TM-148
2. Line pressure testTM-157
3. Accelerator pedal position sensor TM-71
4. CAN communication line LAN-4
5. Transmission range switchTM-45
6. Control cable adjustmentTM-164
7. Control valve with TCMTM-172
OFF vehicle8. Torque converter
TM-204
9. Oil pump assemblyTM-172
10. 1st one-way clutchTM-172
11. Gear systemTM-172
12. Reverse brakeTM-172
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
TM-8
, TM-9.TM-172
14. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
TM-8
, TM-9. TM-172
No. Items
Symptom Condition Diagnostic ItemReference
page
Revision: April 20092010 QX56

TM-134
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
36Slips/Will
Not En-
gage With selector lever in
“R” position
, accelera-
tion is extremely poor. ON vehicle1. Fluid level and state
TM-148
2. Line pressure testTM-157
3. Accelerator pedal position sensor TM-71
4. High and low reverse clutch solenoid valve LAN-4
5. CAN communication lineLAN-4
6. Transmission range switchTM-45
7. Control cable adjustmentTM-164
8. Control valve with TCMTM-172
OFF vehicle9. Gear system
TM-17210. Output shaftTM-172
11. Reverse brakeTM-172
37While starting off by
accelerating in 1st, en-
gine races or slippage
occurs. ON vehicle
1. Fluid level and state
TM-148
2. Line pressure testTM-157
3. Accelerator pedal position sensor TM-71
4. CAN communication line LAN-4
5. Control valve with TCMTM-172
OFF vehicle6. Torque converter
TM-172
7. Oil pump assemblyTM-172
8. 3rd one-way clutchTM-172
9. 1st one-way clutchTM-232
10. Gear systemTM-172
11. Reverse brakeTM-172
12. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
TM-8
, TM-9. TM-172
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
TM-8
, TM-9. TM-172
38 While accelerating in
2nd, engine races or
slippage occurs. ON vehicle
1. Fluid level and state
TM-148
2. Line pressure testTM-157
3. Accelerator pedal position sensor TM-71
4. CAN communication line LAN-4
5. Direct clutch solenoid valveTM-86
6. Control valve with TCMTM-172
OFF vehicle7. Torque converter
TM-172
8. Oil pump assemblyTM-172
9. 3rd one-way clutchTM-172
10. Gear systemTM-172
11. Direct clutchTM-172
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to TM-8
, TM-9. TM-172
No. Items
Symptom Condition Diagnostic ItemReference
page
Revision: April 20092010 QX56

SYSTEM SYMPTOMTM-135
< SYMPTOM DIAGNOSIS >
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Slips/Will
Not En-
gage While accelerating in
3rd, engine races or
slippage occurs.
ON vehicle
1. Fluid level and state
TM-148
2. Line pressure testTM-157
3. Accelerator pedal position sensor TM-71
4. CAN communication line LAN-4
5. High and low reverse clutch solenoid valveTM-88
6. Control valve with TCMTM-172
OFF vehicle7. Torque converter
TM-172
8. Oil pump assemblyTM-172
9. 3rd one-way clutchTM-172
10. Gear systemTM-172
11. High and low reverse clutchTM-172
12. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
TM-8
, TM-9.TM-172
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
TM-8
, TM-9. TM-172
40 While accelerating in
4th, engine races or
slippage occurs. ON vehicle
1. Fluid level and state
TM-148
2. Line pressure testTM-157
3. Accelerator pedal position sensor TM-71
4. CAN communication line LAN-4
5. Input clutch solenoid valveTM-82
6. Control valve with TCMTM-172
OFF vehicle7. Torque converter
TM-172
8. Oil pump assemblyTM-172
9. Input clutchTM-172
10. Gear systemTM-172
11. High and low reverse clutchTM-172
12. Direct clutchTM-172
No. ItemsSymptom Condition Diagnostic ItemReference
page
Revision: April 20092010 QX56