check engine INFINITI QX56 2006 Factory Owner's Manual

AT-56
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
4. CHECK “N” POSITION FUNCTIONS
1. Start the engine.
2. Move selector lever to “N ” position.
3. Release the parking brake.
Does vehicle move forward or backward?
YES >> Enter a check mark at “In “N” Position Vehicle Moves” on the diagnostics worksheet, then con-
tinue the road test.
NO >> GO TO 5.
5. CHECK SHIFT SHOCK
1. Engage the brake.
2. Move selector lever to “D ” position.
When the transmission is shifted from
“N” to “D”, is there an excessive shock?
YES >> Enter a check mark at “Large Shock ("N" to "D" Position) on the diagnostics worksheet, then con- tinue the road test.
NO >> GO TO 6.
6. CHECK “R” POSITION FUNCTIONS
1. Engage the brake.
2. Move selector lever to “R ” position.
3. Release the brake for 4 to 5 seconds.
Does the vehicle creep backward?
YES >> GO TO 7.
NO >> Enter a check mark at “Vehicle Does Not Creep Backward In "R" Position ” on the diagnostics
worksheet, then continue the road test.
7. CHECK “D” POSITION FUNCTIONS
Inspect whether the vehicle creeps forward when the transmission is put into the “D” position.
Does the vehicle creep forward in the
“D” positions?
YES >> Go to AT- 5 6 , "Cruise Test - Part 1" , AT- 5 8 , "Cruise Test - Part 2" , and AT- 5 9 , "Cruise Test - Part
3" .
NO >> Enter a check mark at “Vehicle Does Not Creep Forward in "D" Position ” on the diagnostics work-
sheet, then continue the road test.
Cruise Test - Part 1ECS00CEH
1. CHECK STARTING OUT FROM D1
1. Drive the vehicle for about 10 minutes to warm up the engine oil and ATF. Appropriate temperature for the ATF: 50 - 80° C (122 - 176°F)
2. Park the vehicle on a level surface.
3. Move selector lever to “P ” position.
4. Start the engine.
5. Move selector lever to “D ” position.
6. Press the accelerator pedal about half way down to accelerate the vehicle.
With CONSULT-II
Read off the gear positions.
Starts from D1?
YES >> GO TO 2.
NO >> Enter a check mark at “Vehicle Cannot be Started From D1 ” on the diagnostics worksheet, then
continue the road test.

AT-58
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
6. CHECK LOCK-UP
When releasing accelerator pedal from D5, check lock-up from D5 to L/U.

Refer to AT- 6 0 , "Vehicle Speed When Shifting Gears" .
With CONSULT-II
Select “TCC SOLENOID 0.00A ” with the “MAIN SIGNAL ” mode for A/T.
Does it lock-up?
YES >> GO TO 7.
NO >> Enter a check mark at “A/T Does Not Perform Lock-up” on the diagnostics worksheet, then con-
tinue the road test.
7. CHECK LOCK-UP HOLD
Does it maintain lock-up status?
YES >> GO TO 8.
NO >> Enter a check mark at “A/T Does Not Hold Lock-up Condition ” on the diagnostics worksheet, then
continue the road test.
8. CHECK LOCK-UP RELEASE
Check lock-up cancellation by depressing brake pedal lightly to decelerate. With CONSULT-II
Select “TCC SOLENOID 0.00A ” with the “MAIN SIGNAL ” mode for A/T.
Does lock-up cancel?
YES >> GO TO 9.
NO >> Enter a check mark at “Lock-up Is Not Released” on the diagnostics worksheet, then continue the
road test.
9. CHECK SHIFT-DOWN D5 → D4
Decelerate by pressing lightly on the brake pedal. With CONSULT-II
Read the gear position and engine speed.
When the A/T shift-down D5
→ D4, does the engine speed drop smoothly back to idle?
YES >> 1. Stop the vehicle.
2. Go to Cruise test - Part 2 (Refer to AT- 5 8
).
NO >> Enter a check mark at “Engine Speed Does Not Return to Idle” on the diagnostics worksheet, then continue the road test. Go to Cruise test - Part 2 (Refer to AT- 5 8
).
Cruise Test - Part 2ECS00CEI
1. CHECK STARTING FROM D1
1. Move selector lever the “D ” position.
2. Accelerate at half throttle.
With CONSULT-II
Read the gear position.
Does it start from D1?
YES >> GO TO 2.
NO >> Enter a check mark at “Vehicle Cannot Be Started From D1 ” on the diagnostics worksheet, then
continue the road test.

TROUBLE DIAGNOSISAT-59
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Revision: November 2009 2006 QX56
2. CHECK SHIFT-UP D1 → D2
Press the accelerator pedal down all the way and inspect whether or not the transmission shifts up (D1 → D2)
at the correct speed.

Refer to AT- 6 0 , "Vehicle Speed When Shifting Gears" .
With CONSULT-II
Read the gear position, throttle position and vehicle speed.
Does the A/T shift-up D1
→ D2 at the correct speed?
YES >> GO TO 3.
NO >> Enter a check mark at “Vehicle Does Not Shift: D1 → D2 ” on the diagnostics worksheet, then con-
tinue the road test.
3. CHECK SHIFT-UP D2 → D3
Press the accelerator pedal down all the way and inspect whether or not the transmission shifts up (D2 → D3)
at the correct speed.

Refer to AT- 6 0 , "Vehicle Speed When Shifting Gears" .
With CONSULT-II
Read the gear position, throttle position and vehicle speed.
Does the A/T shift-up D2
→ D3 at the correct speed?
YES >> GO TO 4.
NO >> Enter a check mark at “Vehicle Does Not Shift: D2 → D3 ” on the diagnostics worksheet, then con-
tinue the road test.
4. CHECK SHIFT-UP D3 → D4 AND ENGINE BRAKE
When the transmission changes speed D3 → D4, return the accelerator pedal.
Does the A/T shift-up D3
→ D4 and apply the engine brake?
YES >> 1. Stop the vehicle.
2. See AT- 5 9 , "
Cruise Test - Part 3" .
NO >> Enter a check mark at “Vehicle Does Not Shift: D3 → D4 ” on the diagnostics worksheet, then con-
tinue the road test.
Cruise Test - Part 3ECS00CEJ
1. CHECK SHIFT-DOWN
During D
5 driving, move gear selector from D → 4 → 3 → 2 → 1.
With CONSULT-II
Read the gear position.
Is downshifting correctly performed?
YES >> GO TO 2.
NO >> Enter a check mark at “Vehicle does not shift ” at the corresponding position (5th → 4th, 4th → 3rd,
3rd → 2nd, 2nd → 1st) on the diagnostics worksheet, then continue the road test.
2. CHECK ENGINE BRAKE
Does engine braking effectively reduce speed in 1
1 position?
YES >> 1. Stop the vehicle. 2. Carry out the self-diagnostics. Refer to AT- 8 6 , "
SELF-DIAGNOSTIC RESULT MODE" .
NO >> Enter a check mark at “Vehicle Does Not Decelerate By Engine Brake ” on the diagnostics work-
sheet, then continue trouble diagnosis.

TROUBLE DIAGNOSISAT-61
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Revision: November 2009 2006 QX56
Symptom ChartECS00CEN

The diagnostics item numbers show the sequence for inspection. Inspect in order from item 1.

Overhaul and inspect inside the A/T only if A/T fluid condition is NG. Refer to AT- 5 1 , "A/T FLUID
CHECK" .
No. Items Symptom Condition Diagnostic ItemReference
page
1
Shift
Shock Large shock. (
“N ” → “
D ” position)
Refer to AT-182,
"Large Shock (“N” to
“D” Position)" . ON vehicle 1. Engine idle speed
EC-76
2. Engine speed signalAT- 11 6
3. Accelerator pedal position sensorAT-124
4. Control cable adjustmentAT-227
5. ATF temperature sensorAT-127
6. ATF pressure switch 1 and front brake solenoid valveAT-159,
AT-143
7. CAN communication line AT- 9 6
8. Fluid level and stateAT- 5 1
9. Line pressure testAT- 5 2
10. Control valve with TCMAT-230
OFF vehicle11. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 7 , AT- 1 8
.) AT-264
2Shock is too large
when changing D1 →

D
2 . ON vehicle1. Accelerator pedal position sensor
AT-124
2. Control cable adjustmentAT-227
3. ATF pressure switch 5 and direct clutch solenoid valveAT-163,
AT-147
4. CAN communication line AT- 9 6
5. Engine speed signalAT- 11 6
6. Turbine revolution sensorAT-109
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT-132
8. Fluid level and state AT- 5 1
9. Control valve with TCMAT-230
OFF vehicle 10. Direct clutch AT-298
3Shock is too large
when changing D2 →

D
3 . ON vehicle1. Accelerator pedal position sensor
AT-124
2. Control cable adjustmentAT-227
3. ATF pressure switch 6, high and low reverse clutch sole-
noid valveAT-165,
AT-151
4. CAN communication line AT- 9 6
5. Engine speed signalAT- 11 6
6. Turbine revolution sensorAT-109
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT-132
8. Fluid level and state AT- 5 1
9. Control valve with TCMAT-230
OFF vehicle 10. High and low reverse clutch AT-296

AT-84
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
CONSULT-II Function (A/T)ECS00CEP
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II REFERENCE VALUE
NOTICE:
1. The CONSULT-II electrically displays shift timing and lock-up timing (that is, operation timing of each sole-
noid).
Check for time difference between actual shift timing and the CONSULT-II display. If the difference is
noticeable, mechanical parts (except solenoids, sensors, etc.) may be malfunctioning. Check mechanical
parts using applicable diagnostic procedures.
2. Shift schedule (which implies gear position) displayed on CONSULT-II and that indicated in Service Man- ual may differ slightly. This occurs because of the following reasons:
–Actual shift schedule has more or less tolerance or allowance,
–Shift schedule indicated in Service Manual refers to the point where shifts start, and
–Gear position displayed on CONSULT-II indicates the point where shifts are completed.
3. Display of solenoid valves on CONSULT-II changes at the start of shifting, while gear position is displayed upon completion of shifting (which is computed by TCM).
TCM diagnostic mode Description
WORK SUPPORT Supports inspections and adjustments. Commands are transmitted to the TCM for setting the status
suitable for required operation, input/output signals are received from the TCM and received data is
displayed.
SELF-DIAG RESULTS Displays TCM self-diagnosis results.
DATA MONITOR Displays TCM input/output data in real time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read.
ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
FUNCTION TEST Conducted by CONSULT-II instead of a technician to determine whether each system is
“OK ” or
“ NG ”.
ECU PART NUMBER TCM part number can be read.
Item name Condition Display value (Approx.)
ATF TEMP SE 1 0°C (32 ° F) - 20 °C (68 °F) - 80 °C (176 °F) 3.3 - 2.7 - 0.9 V
ATF TEMP SE 2 3.3 - 2.5 - 0.7 V
TCC SOLENOID When perform slip lock-up
0.2 - 0.4 A
When perform lock-up 0.4 - 0.6 A
SLCT LVR POSI Selector lever in
“N ”,“ P ” position. N/P
Selector lever in “R ” position. R
Selector lever in “D ” position. D
Selector lever in “4 ” position. 4
Selector lever in “3 ” position. 3
Selector lever in “2 ” position. 2
Selector lever in “1 ” position. 1
VHCL/S SE ·A/T During driving Approximately matches the
speedometer reading.
ENGINE SPEED Engine running Closely matches the tachometer
reading.
LINE PRES SOL During driving 0.2 - 0.6 A
TURBINE REV During driving (lock-up ON) Approximately matches the
engine speed.
VHCL/S SE ·MTR During driving Approximately matches the
speedometer reading.

AT-86
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
CONSULT-II SETTING PROCEDURE
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.

For details, refer to the separate “CONSULT-II Operations Man-
ual ”.
1. Turn ignition switch “ OFF”.
2. Connect CONSULT-II and CONSULT-II CONVERTER to data link connector, which is located in instrument lower panel on
driver side.
3. Turn ignition switch “ ON”. (Do not start engine.)
4. Touch “START (NISSAN BASED VHCL) ”.
5. Touch “A/T”.
If “A/T ” is not indicated, go to GI-40, "
CONSULT-II Data Link
Connector (DLC) Circuit" .
6. Perform each diagnostic test mode according to each service procedure.
SELF-DIAGNOSTIC RESULT MODE
Operation Procedure
After performing AT- 8 6 , "SELF-DIAGNOSTIC RESULT MODE" , place check marks for results on the AT- 4 6 ,
"DIAGNOSTIC WORKSHEET" . Reference pages are provided following the items.
1. Perform “CONSULT-II SETTING PROCEDURE ”. Refer to AT- 8 6 , "
CONSULT-II SETTING PROCEDURE"
.
BBIA0369E
BCIA0029E
BCIA0030E

DTC U1000 CAN COMMUNICATION LINEAT-99
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Diagnostic ProcedureECS00CEV
1. CHECK CAN COMMUNICATION CIRCUIT
With CONSULT-II
1. Turn ignition switch “ON” and start engine.
2. Select “SELF-DIAG RESULTS” mode for “A/T ” with CONSULT-
II.
Is any malfunction of the
“CAN COMM CIRCUIT” indicated?
YES >> Print out CONSULT-II screen, GO TO LAN section. Refer to LAN-3, "
Precautions When Using CONSULT-II"
.
NO >> INSPECTION END
PCIA0061E

AT-102
DTC P0615 START SIGNAL CIRCUIT
Revision: November 20092006 QX56
TCM terminals and data are reference value. Measured between each terminal and ground.
Diagnostic ProcedureECS00CF2
1. CHECK STARTER RELAY
With CONSULT-II
1. Turn ignition switch “ ON”. (Do not start engine.)
2. Select “SELECTION FROM MENU ” in “DATA MONITOR” mode
for “A/T” with CONSULT-II and check monitor “STARTER
RELAY ” ON/OFF.
Without CONSULT-II
1. Turn ignition switch “ ON”. (Do not start engine.)
2. Check voltage between the IPDM E/R connector and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2. CHECK HARNESS BETWEEN A/T ASSEMBLY HARNESS CONNECTOR AND IPDM E/R CONEC-
TOR.
1. Turn ignition switch OFF.
2. Disconnect A/T assembly harness connector and IPDM E/R connector.
3. Check continuity between A/T assembly harness connector and IPDM E/R connector.
4. If OK, check harness for short to ground and short to power.
5. Reinstall any part removed.
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
Terminal Item ConditionData (Approx.)
9Starter relay Selector lever in "N" and "P" positions. Battery voltage
Selector lever in other positions.
0V
Item nameCondition Display value
STARTER RELAY Selector lever in "N'', "P'' positions. ON
Selector lever in other positions.
OFF
PCIA0056E
ItemTerminal Shift position Voltage (Approx.)
Starter
relay 48 Ground "N'' and "P'' Battery voltage
"R'' and "D'' 0V
LCIA0320E
Item Connector Terminal Continuity
A/T assembly harness con-
nector F9
9
Ye s
IPDM E/R connector E12248
WCIA0427E

DTC P0615 START SIGNAL CIRCUITAT-103
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3. CHECK TERMINAL CORD ASSEMBLY
1. Remove control valve with TCM. Refer to AT- 2 3 0 , "
Control Valve With TCM and A/T Fluid Temperature
Sensor 2" .
2. Disconnect A/T assembly harness connector and TCM connector.
3. Check continuity between A/T assembly harness connector ter- minal and TCM connector terminal.
4. If OK, check harness for short to ground and short to power.
5. Reinstall any part removed.
OK or NG
OK >> GO TO 4.
NG >> Replace open circuit or short to ground and short to power in harness or connectors.
4. DETECT MALFUNCTIONING ITEM
Check the following items:

Starter relay, Refer to SC-10, "STARTING SYSTEM" .

IPDM E/R, Refer to PG-18, "IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE
ROOM)" .
OK or NG
OK >> Replace the control valve with TCM. Refer to AT- 2 3 0 , "Control Valve With TCM and A/T Fluid
Temperature Sensor 2"
NG >> Repair or replace damaged parts.
5. CHECK DTC
Perform “DTC Confirmation Procedure ”.

Refer to AT- 1 0 0 , "DTC Confirmation Procedure" .
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
Item Connector Terminal Continuity
A/T assembly harness con-
nector F9
9
Ye s
TCM connector F5028
SCIA5440E

AT-104
DTC P0700 TCM
Revision: November 20092006 QX56
DTC P0700 TCMPFP:31036
DescriptionECS00CLQ
The TCM consists of a microcomputer and connectors for signal input and output and for power supply. The
TCM controls the A/T.
On Board Diagnosis LogicECS00CLR

This is an OBD-II self-diagnostic item.

Diagnostic trouble code “P0700 TCM” with CONSULT-II is detected when the TCM is malfunctioning.
Possible CauseECS00CLS
TCM.
DTC Confirmation ProcedureECS00CLT
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. Run engine for at least 2 consecutive seconds at idle speed.
5. If DTC is detected, go to AT- 1 0 4 , "
Diagnostic Procedure" .
WITH GST
Follow the procedure “With CONSULT-II”.
Diagnostic ProcedureECS00CLU
1. CHECK DTC
With CONSULT-II
1. Turn ignition switch “ ON”. (Do not start engine.)
2. Select “SELF DIAG RESULTS ” mode for “A/T” with CONSULT-
II.
3. Touch “ERASE”.
4. Turn ignition switch “ OFF” and wait at least 10 seconds.
5. Perform DTC Confirmation Procedure, AT- 1 0 4 , "
DTC Confirma-
tion Procedure" .
Is the
“TCM” displayed again?
YES >> Replace the control valve with TCM. Refer to AT- 2 3 0 ,
"Control Valve With TCM and A/T Fluid Temperature
Sensor 2" .
NO >> INSPECTION END
BCIA0030E
BCIA0031E