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Home >> Infiniti >> 2008 >> M35 V6-3.5L (VQ35DE) >> Repair and Diagnosis >> Powertrain Management >> Transmission Control Systems >> Testing and Inspection >> Initial Inspection and Diagnostic Overview >> Road Test

Road Test

DESCRIPTION
^ The road test checks overall performance of the A/T and analyzes possible malfunction causes.
^ The road test is carried out in the following three stages.

1. Check before engine is started.
2. Check at idle.
3. Cruise test
^ Inspect all the items Part 1 to Part 3.
^ Before beginning the road test, check the procedure and inspection items.
^ Test all inspection items until the symptom is uncovered. Include NG items in "Diagnostic Worksheet Chart" (Refer to AT-44). How to Perform Trouble Diagnosis For Quick and Accurate Repair
Perform a diagnosis of the NG items after the completion of all the road test.

CHECK BEFORE ENGINE IS STARTED

1.CHECK A/T CHECK INDICATOR LAMP
1. Park vehicle on level surface.
2. Move selector lever to "P" position.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
Does A/T CHECK indicator lamp light up for about 2 seconds?
YES - 1 >> With CONSULT-III
1. Select "SELF-DIAG RESULTS" mode for "TRANSMISSION" with CONSULT-III and record all NG items on the "Diagnostic Worksheet Chart".
2. Go to "CHECK AT IDLE".
YES - 2 >> Without CONSULT-III
1. Perform self-diagnostics and record all NG items on the "Diagnostic Worksheet Chart". Refer to AT-92, "Diagnosis Procedure without CONSULT-III". Diagnosis Procedure Without Consult-III
2. Go to "CHECK AT IDLE".
NO >> Stop the road test and go to AT-171, "A/T Check Indicator Lamp Does Not Come On". A/T Check Indicator Lamp Does Not Come On

CHECK AT IDLE

1.CHECK STARTING THE ENGINE
1. Park vehicle on level surface.
2. Move selector lever to "P" or "N" position.
3. Turn ignition switch OFF.
4. Start engine.
Does the engine start?
YES >> GO TO 2.
NO >> Stop the road test and go to AT-171, "Engine Cannot Be Started in "P" or "N" Position". Engine Cannot Be Started In "P" or "N" Position

2.CHECK STARTING THE ENGINE
1. Turn ignition switch ON.
2. Move selector lever to "D", "M" or "R" position.
3. Start engine.
Does the engine start in any positions?
YES >> Stop the road test and go to AT-171, "Engine Cannot Be Started in "P" or "N" Position". Engine Cannot Be Started In "P" or "N" Position
NO >> GO TO 3.

3.CHECK "P" POSITION FUNCTIONS
1. Move selector lever to "P" position.
2. Turn ignition switch OFF.
3. Release the parking brake.
4. Push the vehicle forward or backward.
5. Engage the parking brake.
When you push the vehicle with disengaging the parking brake, does it move?
YES >> Enter a check mark at AT-172, "In "P" Position, Vehicle Moves When Pushed" on the "Diagnostic Worksheet Chart", GO TO 4.
NO >> GO TO 4.

4.CHECK "N" POSITION FUNCTIONS
1. Start 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 AT-172, "In "N" Position, Vehicle Moves" on the "Diagnostic Worksheet Chart", GO TO 5.
NO >> GO TO 5.

5.CHECK SHIFT SHOCK
1. Engage the brake.
2. Move selector lever to "D" position.
When the A/T is shifted from "N" to "D", is there an excessive shock?
YES >> Enter a check mark at AT-173, "Large Shock ("N" to "D" Position)" on the "Diagnostic Worksheet Chart", GO TO 6.
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 AT-175, "Vehicle Does Not Creep Backward in "R" Position" on the "Diagnostic Worksheet Chart", GO TO 7.

7.CHECK "D" POSITION FUNCTIONS
Inspect whether the vehicle creep forward when the A/T is put into the "D" position.
Does the vehicle creep forward in the "D" position?
YES >> Go to "CRUISE TEST - PART 1".
NO >> Enter a check mark at AT-177, "Vehicle Does Not Creep Forward in "D" Position" on the "Diagnostic Worksheet Chart", then continue the road test. Go to "CRUISE TEST - PART 1".

CRUISE TEST - PART 1

1.CHECK STARTING OUT FROM D1
1. Drive the vehicle for about 10 minutes to warm up the engine oil and [1][2]ATF.
Appropriate temperature for the [1][2]ATF: 50 to 80 degreesC (122 to 176 degreesF)
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-III
Read the value of "GEAR". Refer to AT-85, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
Starts from D1?
YES >> GO TO 2.
NO >> Enter a check mark at AT-179, "Vehicle Cannot Be Started from D1" on the "Diagnostic Worksheet Chart", GO TO 2.

2.CHECK SHIFT-UP D1 ---> D2
Press down the accelerator pedal about half-way and inspect if the vehicle shifts up (D1 ---> D2) at the appropriate speed.

With CONSULT-III
Read the value of "GEAR", "ACCELE POSI" and "VEHCLE SPEED" with "DATA MONITOR" mode. Refer to AT-85, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
Does the A/T shift-up D1 ---> D2 at the correct speed?
YES >> GO TO 3.
NO >> Enter a check mark at AT-180, "A/T Does Not Shift: D1 ---> D2" on the "Diagnostic Worksheet Chart", GO TO 3.

3.CHECK SHIFT-UP D2 ---> D3
Press down the accelerator pedal about half-way and inspect if the vehicle shifts up (D2 ---> D3) at the appropriate speed.

With CONSULT-III
Read the value of "GEAR", "ACCELE POSI" and "VEHCLE SPEED" with "DATA MONITOR" mode. Refer to AT-85, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
Does the A/T shift-up D2 ---> D3 at the correct speed?
YES >> GO TO 4.
NO >> Enter a check mark at AT-182, "A/T Does Not Shift: D2 ---> D3" on the "Diagnostic Worksheet Chart", GO TO 4.

4.CHECK SHIFT-UP D3 ---> D4
Press down the accelerator pedal about half-way and inspect if the vehicle shifts up (D3 ---> D4) at the appropriate speed.

With CONSULT-III
Read the value of "GEAR", "ACCELE POSI" and "VEHCLE SPEED" with "DATA MONITOR" mode. Refer to AT-85, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
Does the A/T shift-up D3 ---> D4 at the correct speed?
YES >> GO TO 5.
NO >> Enter a check mark at AT-184, "A/T Does Not Shift: D3 ---> D4" on the "Diagnostic Worksheet Chart", GO TO 5.

5.CHECK SHIFT-UP D4 ---> D5
Press down the accelerator pedal about half-way and inspect if the vehicle shifts up (D4 ---> D5) at the appropriate speed.

With CONSULT-III
Read the value of "GEAR", "ACCELE POSI" and "VEHCLE SPEED" with "DATA MONITOR" mode. Refer to AT-85, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
Does the A/T shift-up D4 ---> D5 at the correct speed?
YES >> GO TO 6.
NO >> Enter a check mark at AT-185, "A/T Does Not Shift: D4 ---> D5" on the "Diagnostic Worksheet Chart", GO TO 6.

6.CHECK LOCK-UP
When releasing accelerator pedal (closed throttle position signal: OFF) from D5, check lock-up from D5 to L/U.

With CONSULT-III
Select "TCC SOLENOID" with the "DATA MONITOR" mode. Refer to AT-85, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
Does it lock-up?
YES >> GO TO 7.
NO >> Enter a check mark at AT-187, "A/T Does Not Lock-up" on the "Diagnostic Worksheet Chart", GO TO 7.

7.CHECK LOCK-UP HOLD
Check hold lock-up.

With CONSULT-III
Select "TCC SOLENOID" with the "DATA MONITOR" mode. Refer to AT-85, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
Does it maintain lock-up status?
YES >> GO TO 8.
NO >> Enter a check mark at AT-188, "A/T Does Not Hold Lock-up Condition" on the "Diagnostic Worksheet Chart", then continue the road test.

8.CHECK LOCK-UP RELEASE
Check lock-up cancellation by depressing brake pedal lightly to decelerate.

With CONSULT-III
Select "TCC SOLENOID" with the "DATA MONITOR" mode. Refer to AT-85, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
Does lock-up cancel?
YES >> GO TO 9.
NO >> Enter a check mark at AT-189, "Lock-up Is Not Released" on the "Diagnostic Worksheet Chart", GO TO 9.

9.CHECK SHIFT-DOWN D5 ---> D4
Decelerate by pressing lightly on the brake pedal.

With CONSULT-III
Read the value of "GEAR" and "ENGINE SPEED" with "DATA MONITOR" mode. Refer to AT-85, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
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".
NO >> Enter a check mark at AT-190, "Engine Speed Does Not Return to Idle" on the "Diagnostic Worksheet Chart", then continue the road test. Go to "CRUISE TEST - PART 2".

CRUISE TEST - PART 2

1.CHECK STARTING FROM D1
1. Move selector lever to "D" position.
2. Accelerate at half throttle.

With CONSULT-III
Read the value of "GEAR" with "DATA MONITOR" mode. Refer to AT-85, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
Does it start from D1?
YES >> GO TO 2.
NO >> Enter a check mark at AT-179, "Vehicle Cannot Be Started from D1" on the "Diagnostic Worksheet Chart", GO TO 2.

2.CHECK SHIFT-UP D1 ---> D2
Press the accelerator pedal down all the way and inspect whether or not the A/T shifts up (D1 ---> D2) at the correct speed.

With CONSULT-III
Read the value of "GEAR", "ACCELE POSI" and "VEHCLE SPEED" with "DATA MONITOR" mode. Refer to AT-85, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
Does the A/T shift-up D1 ---> D2 at the correct speed?
YES >> GO TO 3.
NO >> Enter a check mark at AT-180, "A/T Does Not Shift: D1 ---> D2" on the "Diagnostic Worksheet Chart", GO TO 3.

3.CHECK SHIFT-UP D2 ---> D3
Press the accelerator pedal down all the way and inspect whether or not the A/T shifts up (D2 ---> D3) at the correct speed.

With CONSULT-III
Read the value of "GEAR", "ACCELE POSI" and "VEHCLE SPEED" with "DATA MONITOR" mode. Refer to AT-85, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
Does the A/T shift-up D2 ---> D3 at the correct speed?
YES >> GO TO 4.
NO >> Enter a check mark at AT-182, "A/T Does Not Shift: D2 ---> D3" on the "Diagnostic Worksheet Chart", GO TO 4.

4.CHECK SHIFT-UP D3 ---> D4 AND ENGINE BRAKE
When the A/T changes speed D3 ---> D4, return the accelerator pedal.

With CONSULT-III
Read the value of "GEAR" with "DATA MONITOR" mode. Refer to AT-85, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
Does the A/T shift-up D3 ---> D4 and apply the engine brake?
YES >> 1. Stop the vehicle.
2. Go to "CRUISE TEST - PART 3".
NO >> Enter a check mark at AT-184, "A/T Does Not Shift: D3 ---> D4" on the "Diagnostic Worksheet Chart", then continue the road test. Go to "CRUISE TEST - PART 3".

CRUISE TEST - PART 3

1.MANUAL MODE FUNCTION
Move to manual mode from "D" position.
Does it switch to manual mode?
YES >> GO TO 2.
NO >> Continue road test and add check mark to AT-191, "Cannot Be Changed to Manual Mode" on the "Diagnostic Worksheet Chart", GO TO 2.

2.CHECK SHIFT-DOWN
During manual mode driving, is downshift from M5 ---> M4 ---> M3 ---> M2 ---> M1 performed?

With CONSULT-III
Read the value of "GEAR" with "DATA MONITOR" mode. Refer to AT-85, "CONSULT-III Function (TRANSMISSION)". Consult-III Function (Transmission)
Is downshifting correctly performed?
YES >> GO TO 3.
NO >> Enter a check mark at "Vehicle Does Not Shift" at the corresponding position (5th ---> 4th, 4th ---> 3rd, 3rd ---> 2nd, 2nd ---> 1st) on the "Diagnostic Worksheet Chart", GO TO 3.

3.CHECK ENGINE BRAKE
Check engine brake.
Does engine braking effectively reduce speed in M1 position?
YES - 1 >> With CONSULT-III
1. Stop the vehicle.
2. Select "SELF-DIAG RESULTS" mode for "TRANSMISSION" with CONSULT-III.
YES - 2 >> Without CONSULT-III
1. Stop the vehicle.
2. Perform self-diagnostics. Refer to AT-92, "Diagnosis Procedure without CONSULT-III". Diagnosis Procedure Without Consult-III
NO - 1 >> With CONSULT-III
1. Enter a check mark at AT-196, "Vehicle Does Not Decelerate by Engine Brake" on the "Diagnostic Worksheet Chart".
2. Select "SELF-DIAG RESULTS" mode for "TRANSMISSION" with CONSULT-III.
NO - 2 >> Without CONSULT-III
1. Enter a check mark at AT-196, "Vehicle Does Not Decelerate by Engine Brake" on the "Diagnostic Worksheet Chart".
2. Perform self-diagnostics. Refer to AT-92, "Diagnosis Procedure without CONSULT-III". Diagnosis Procedure Without Consult-III




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