2005 NISSAN NAVARA engine control

TROUBLE DIAGNOSIS
AT-35
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A/T Interlock
lIf there is an A/T interlock judgment malfunction, the A/T is fixed in 2nd gear to make driving possible.
NOTE:
When the vehicle is driven fixed in 2nd gear, a turbine revolution sensor malfunction is displayed,
but this is not a turbine revolution sensor malfunction.
lWhen the coupling pattern below is detected, the fail-safe action corresponding to the pattern is per-
formed.
A/T INTERLOCK COUPLING PATTERN TABLE
l:NG X:OK
A/T 1st Engine Braking
When there is an A/T first gear engine brake judgment malfunction, the low coast brake solenoid is switched
OFF to avoid the engine brake operation.
Line Pressure Solenoid
The solenoid is switched OFF and the line pressure is set to the maximum hydraulic pressure to make driving
possible.
Torque Converter Clutch Solenoid
The solenoid is switched OFF to release the lock-up.
Low Coast Brake Solenoid
When a malfunction (electrical or functional) occurs, in order to make driving possible. If the solenoid is ON,
the A/T is held in 2nd gear. If the solenoid is OFF, the A/T is held in 4th gear. (Engine brake is not applied in
1st and 2nd gear.)
Input Clutch Solenoid
If a malfunction (electrical or functional) occurs with the solenoid either ON or OFF, the A/T is held in 4th gear
to make driving possible.
Direct Clutch Solenoid
If a malfunction (electrical or functional) occurs with the solenoid either ON or OFF, the A/T is held in 4th gear
to make driving possible.
Front Brake Solenoid
If a malfunction (electrical or functional) occurs with the solenoid ON, in order to make driving possible, the A/
T is held in 5th gear. If the solenoid is OFF, the A/T 4th gear.
High and Low Reverse Clutch Solenoid
If a malfunction (electrical or functional) occurs with the solenoid either ON or OFF, the A/T is held in 4th gear
to make driving possible.
Turbine Revolution Sensor 1 or 2
The control is the same as if there were no turbine revolution sensors, 5th gear is prohibited.
Gear positionATF pressure switch output
Fail-safe
functionClutch pressure output pattern after fail-safe func-
tion
SW3
(I/C)SW6
(HLR/C)SW5
(D/C)SW1
(FR/B)SW2
(LC/B)I/C HLR/C D/C FR/B LC/B L/U
A/T interlock
coupling pat-
tern3rd – X X –lHeld in
2nd gearOFF OFF ON OFF OFF OFF
4th – X X –lHeld in
2nd gearOFF OFF ON OFF OFF OFF
5th X X – XlHeld in
2nd gearOFF OFF ON OFF OFF OFF

AT-36
TROUBLE DIAGNOSIS
How to Perform Trouble Diagnosis for Quick and Accurate Repair
ECS00FWX
INTRODUCTION
The TCM receives a signal from the vehicle speed sensor, accelera-
tor pedal position sensor or PNP switch and provides shift control or
lock-up control via A/T solenoid valves.
Input and output signals must always be correct and stable in the
operation of the A/T system. The A/T system must be in good oper-
ating condition and be free of valve seizure, solenoid valve malfunc-
tion, etc.
It is much more difficult to diagnose a error that occurs intermittently
rather than continuously. Most intermittent errors are caused by poor
electric connections or improper wiring. In this case, careful check-
ing of suspected circuits may help prevent the replacement of good
parts.
A visual check only may not find the cause of the errors. A road test
with CONSULT-II or a circuit tester connected should be performed.
Follow theAT-37, "
WORK FLOW".
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such errors, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A “DIAGNOSTIC WORKSFEET” as
shown on the example (Refer toAT-38
) should be used.
Start your diagnosis by looking for “conventional” errors first. This will
help troubleshoot driveability errors on an electronically controlled
engine vehicle.
Also check related Service bulletins.
SAT631IB
SAT632I
SEF234G

TROUBLE DIAGNOSIS
AT-51
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4.CHECK SHIFT-UP D3®D4AND ENGINE BRAKE
When the A/T changes speed D
3®D4, return accelerator pedal.
With CONSULT-II
Read the gear position. Refer toAT-83, "
DATA MONITOR MODE".
Does the A/T shift-up D
3®D4and apply the engine brake?
YES >> 1. Stop the vehicle.
2. Go toAT-51, "
Cruise Test - Part 3".
NO >> Enter a check mark at “A/T Does Not Shift: D
3®D4”onAT-38, "DIAGNOSTIC WORKSHEET",
then continue the road test. Go toAT-51, "
Cruise Test - Part 3".
Cruise Test - Part 3ECS00FX5
1.CHECK SHIFT-DOWN
1. Confirm overdrive control switch is ON position.
2. Confirm gear selector lever is in “D” position.
3. Accelerate vehicle using half-throttle to D
5.
4. Release accelerator pedal.
5. Set overdrive control switch to OFF position while driving in D
5.
With CONSULT-II
Read the gear position. Refer toAT-83, "
DATA MONITOR MODE".
Does A/T shift from D
5to D4(OD OFF)?
YES >> GO TO 2.
NO >> Enter a check mark at “A/T does not shift: 5th gear®4th gear” on theAT-38, "
DIAGNOSTIC
WORKSHEET", then continue the road test.
2.CHECK SHIFT-DOWN
During D
4driving, is downshift from “D”®“3”®“2”®“1” performed?
With CONSULT-II
Read the gear position. Refer toAT-83, "
DATA MONITOR MODE".
Is downshifting correctly performed?
YES >> GO TO 3.
NO >> Enter a check mark at “A/T does not shift” at the corresponding position (4th®3rd, 3rd®2nd,
2nd®1st) on theAT-38, "
DIAGNOSTIC WORKSHEET", then continue the road test.
3.CHECK ENGINE BRAKE
Check engine brake.
Does engine braking effectively reduce speed in 1
1position?
YES >> 1. Stop the vehicle.
2. Perform self-diagnosis. Refer toAT-80, "
SELF-DIAGNOSTIC RESULT MODE",AT-89, "Diag-
nostic Procedure Without CONSULT-II".
NO >> Enter a check mark at “Vehicle Does Not Decelerate by Engine Brake” on theAT-38, "
DIAGNOS-
TIC WORKSHEET", then continue trouble diagnosis.

TROUBLE DIAGNOSIS
AT-53
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Symptom ChartECS00FX8
lThe diagnostic item numbers show the sequence for inspection. Inspect in order from item 1.
lOverhaul and inspect inside the A/T only if A/T fluid condition is NG. Refer toAT-43, "A/T Fluid Con-
dition Check".
No. Items Symptom Condition Diagnostic ItemReference
page
1
Shift
ShockLarge shock. (“N”®“D”
position)
Refer toAT-180,
"Large Shock (“N”to
“D”Position)".ON vehicle1. Engine idle speedEC-38
2. Engine speed signalAT-108
3. Accelerator pedal position sensorAT- 11 6
4. Control cable adjustmentAT- 2 11
5. A/T fluid temperature sensorAT- 11 8
6. ATF pressure switch 1 and front brake solenoid valveAT-156,
AT-137
7. CAN communication lineAT- 9 1
8. A/T fluid level and stateAT- 4 3
9. Line pressure testAT- 4 4
10. Control valve with TCMAT-218
OFF vehicle11. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer toAT- 1 4 , "Cross-
Sectional View (2WD Models)",AT- 1 5 , "Cross-Sectional View
(4WD Models)".)AT-263
2Shock is too large
when changing D1
®D2.ON vehicle1. Accelerator pedal position sensorAT- 11 6
2. Control cable adjustmentAT- 2 11
3. ATF pressure switch 5 and direct clutch solenoid valveAT-160,
AT-142
4. CAN communication lineAT- 9 1
5. Engine speed signalAT-108
6. Turbine revolution sensorAT-123
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT-103,
AT-125
8. A/T fluid level and stateAT- 4 3
9. Control valve with TCMAT-218
OFF vehicle 10. Direct clutchAT-298
3Shock is too large
when changing D2
®D3.ON vehicle1. Accelerator pedal position sensorAT- 11 6
2. Control cable adjustmentAT- 2 11
3. ATF pressure switch 6 and high and low reverse clutch
solenoid valveAT-162,
AT-147
4. CAN communication lineAT- 9 1
5. Engine speed signalAT-108
6. Turbine revolution sensorAT-123
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT-103,
AT-125
8. A/T fluid level and stateAT- 4 3
9. Control valve with TCMAT-218
OFF vehicle 10. High and low reverse clutchAT-296

AT-54
TROUBLE DIAGNOSIS
4
Shift
ShockShockistoolarge
when changing D3
®D4.ON vehicle1. Accelerator pedal position sensorAT- 11 6
2. Control cable adjustmentAT- 2 11
3. ATF pressure switch 3 and input clutch solenoid valveAT- 1 5 8,
AT- 1 3 2
4. CAN communication lineAT- 9 1
5. Engine speed signalAT- 1 0 8
6. Turbine revolution sensorAT- 1 2 3
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 3,
AT- 1 2 5
8. A/T fluid level and stateAT- 4 3
9. Control valve with TCMAT- 2 1 8
OFF vehicle 10. Input clutchAT- 2 8 6
5Shockistoolarge
when changing D4
®D5.ON vehicle1. Accelerator pedal position sensorAT- 11 6
2. Control cable adjustmentAT- 2 11
3. ATF pressure switch 1 and front brake solenoid valveAT- 1 5 6,
AT- 1 3 7
4. CAN communication lineAT- 9 1
5. Engine speed signalAT- 1 0 8
6. Turbine revolution sensorAT- 1 2 3
7. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 3,
AT- 1 2 5
8. A/T fluid level and stateAT- 4 3
9. Control valve with TCMAT- 2 1 8
OFF vehicle10. Front brake (brake band)AT- 2 5 111. Input clutchAT- 2 8 6
6Shockistoolargefor
downshift when accel-
erator pedal is
pressed.ON vehicle1. Accelerator pedal position sensorAT- 11 6
2. Control cable adjustmentAT- 2 11
3. CAN communication lineAT- 9 1
4. Engine speed signalAT- 1 0 8
5. Turbine revolution sensorAT- 1 2 3
6. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 3,
AT- 1 2 5
7. A/T fluid level and stateAT- 4 3
8. Control valve with TCMAT- 2 1 8
OFF vehicle9. Front brake (brake band)AT- 2 5 110. Input clutchAT- 2 8 6
11. High and low reverse clutchAT- 2 9 6
12. Direct clutchAT- 2 9 8
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-55
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7
Shift
ShockShock is too large for
upshift when accelera-
tor pedal is released.ON vehicle1. Accelerator pedal position sensorAT- 11 6
2. Control cable adjustmentAT- 2 11
3. Engine speed signalAT-108
4. CAN communication lineAT- 9 1
5. Turbine revolution sensorAT-123
6. Vehicle speed sensor A/T and vehicle speed sensor MTRAT-103,
AT-125
7. A/T fluid level and stateAT- 4 3
8. Control valve with TCMAT-218
OFF vehicle9. Front brake (brake band)AT-25110. Input clutchAT-286
11. High and low reverse clutchAT-296
12. Direct clutchAT-298
8Shock is too large for
lock-up.ON vehicle1. Accelerator pedal position sensorAT- 11 6
2. Control cable adjustmentAT- 2 11
3. Engine speed signalAT-108
4. CAN communication lineAT- 9 1
5. Turbine revolution sensorAT-123
6. Vehicle speed sensor A/T and vehicle speed sensor MTRAT-103,
AT-125
7. Torque converter clutch solenoid valveAT- 11 0
8. A/T fluid level and stateAT- 4 3
9. Control valve with TCMAT-218
OFF vehicle 10. Torque converterAT-263
9Shock is too large dur-
ing engine brake.ON vehicle1. Accelerator pedal position sensorAT- 11 6
2. Control cable adjustmentAT- 2 11
3. CAN communication lineAT- 9 1
4. A/T fluid level and stateAT- 4 3
5. Control valve with TCMAT-218
OFF vehicle6. Front brake (brake band)AT-2517. Input clutchAT-286
8. High and low reverse clutchAT-296
9. Direct clutchAT-298
No. Items Symptom Condition Diagnostic ItemReference
page

AT-60
TROUBLE DIAGNOSIS
22
Slips/Will
Not
EngageWhen “D” position,
remains in 5th gear.ON vehicle1. A/T fluid level and stateAT- 4 3
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 3,
AT- 1 2 5
3. ATF pressure switch 1 and front brake solenoid valveAT- 1 5 6,
AT- 1 3 7
4. Line pressure testAT- 4 4
5. CAN communication lineAT- 9 1
6. Control valve with TCMAT- 2 1 8
OFF vehicle7. Front brake (brake band)AT- 2 6 38. Input clutchAT- 2 8 6
9. Gear systemAT- 2 5 1
10. High and low reverse clutchAT- 2 9 6
23Vehicle cannot be
started from D
1.
Refer toAT-186, "
Vehi-
cle Cannot Be Started
from D1".ON vehicle1. A/T fluid level and stateAT- 4 3
2. Accelerator pedal position sensorAT- 11 6
3. Line pressure testAT- 4 4
4. CAN communication lineAT- 9 1
5. Control valve with TCMAT- 2 1 8
OFF vehicle6. Torque converterAT- 2 6 3
7. Oil pump assemblyAT- 2 8 1
8. 3rd one-way clutchAT- 2 8 4
9. 1st one-way clutchAT- 2 9 1
10. Gear systemAT- 2 5 1
11. Reverse brakeAT- 2 6 3
12. Forward one-way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer toAT-
14, "Cross-Sectional View (2WD Models)",AT- 1 5 , "Cross-
Sectional View (4WD Models)".)AT- 2 6 3
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer toAT-14, "
Cross-
Sectional View (2WD Models)",AT-15, "Cross-Sectional View
(4WD Models)".)AT- 2 6 3
24Does not lock-up.
Refer toAT-196, "A/T
Does Not Perform
Lock-up".ON vehicle1. A/T fluid level and stateAT- 4 3
2. Line pressure testAT- 4 4
3. Engine speed signalAT- 1 0 8
4. Turbine revolution sensorAT- 1 2 3
5. Torque converter clutch solenoid valveAT- 11 0
6. CAN communication lineAT- 9 1
7. Control valve with TCMAT- 2 1 8
OFF vehicle8. Torque converterAT- 2 6 39. Oil pump assemblyAT- 2 8 1
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-61
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AT25
Slips/Will
Not
EngageDoes not hold lock-up
condition.
Refer toAT-197, "A/T
Does Not Hold Lock-
up Condition".ON vehicle1. A/T fluid level and stateAT- 4 3
2. Line pressure testAT- 4 4
3. Engine speed signalAT-108
4. Turbine revolution sensorAT-123
5. Torque converter clutch solenoid valveAT- 11 0
6. CAN communication lineAT- 9 1
7. Control valve with TCMAT-218
OFF vehicle8. Torque converterAT-2639. Oil pump assemblyAT-281
26Lock-up is not
released.
Refer toAT-199,
"Lock-up Is Not
Released".ON vehicle1. A/T fluid level and stateAT- 4 3
2. Line pressure testAT- 4 4
3. Engine speed signalAT-108
4. Turbine revolution sensorAT-123
5. Torque converter clutch solenoid valveAT- 11 0
6. CAN communication lineAT- 9 1
7. Control valve with TCMAT-218
OFF vehicle8. Torque converterAT-2639. Oil pump assemblyAT-281
27No shock at all or the
clutch slips when vehi-
cle changes speed D1
®D2.ON vehicle1. A/T fluid level and stateAT- 4 3
2. Vehicle speed sensor A/T and vehicle speed sensor MTRAT-103,
AT-125
3. ATF pressure switch 5 and direct clutch solenoid valveAT-160,
AT-142
4. CAN communication lineAT- 9 1
5. Line pressure testAT- 4 4
6. Control valve with TCMAT-218
OFF vehicle7. Torque converterAT-263
8. Oil pump assemblyAT-281
9. 3rd one-way clutchAT-284
10. Gear systemAT-251
11 . D i r e c t c l u t c hAT-298
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer toAT- 1 4 , "
Cross-
Sectional View (2WD Models)",AT- 1 5 , "Cross-Sectional View
(4WD Models)".)AT-263
No. Items Symptom Condition Diagnostic ItemReference
page