2008 INFINITI FX35 check engine

DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE
AT-149
< SERVICE INFORMATION >
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DTC P1767 HIGH AND LOW REVER SE CLUTCH SOLENOID VALVE
DescriptionINFOID:0000000001327295
High and low reverse clutch solenoid valve is controlled by the TCM in response to signals sent from the PNP
switch, vehicle speed sensor and accelerator pedal positi on sensor (throttle position sensor). Gears will then
be shifted to the optimum position.
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000001327296
On Board Diagnosis LogicINFOID:0000000001327297
Diagnostic trouble code “P1767 HLR/C SOL/CIRC” with CO NSULT-III or 8th judgement flicker without CON-
SULT-III is detected under the following conditions.
 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:0000000001327298
 Harness or connectors
(Solenoid circuit is open or shorted.)
 High and low reverse clutch solenoid valve
DTC Confirmation ProcedureINFOID:0000000001327299
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays 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 MONI TOR” mode for “TRANSMISSION” with CONSULT-III
and check monitor “ACCELE POSI”, “SLCT LVR POSI” and “GEAR”.
3. Touch “START”.
4. Start engine.
5. Drive vehicle and maintain the following conditions for at least 5 consecutive seconds. ACCELE POSI: 1.5/8 - 2.0/8
SLCT LVR POSI: “D” position
GEAR: “2” ⇒ “3” (HLR/C ON/OFF)
Driving location: Driving the vehic le uphill (increased engine load) will help maintain the driving
conditions required for this test.
6. If DTC is detected, go to AT-149, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis ProcedureINFOID:0000000001327300
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.
Item name Condition Display value (Approx.)
HLR/C SOL High and low reverse clutch disengaged. Refer to
AT- 1 8
. 0.6 - 0.8 A
High and low reverse clutch engaged. Refer to AT- 1 8
.0 - 0.05 A
:

DTC P1772 LOW COAST BRAKE SOLENOID VALVE
AT-151
< SERVICE INFORMATION >
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DTC P1772 LOW COAST BRAKE SOLENOID VALVE
DescriptionINFOID:0000000001327307
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 positi on sensor (throttle position sensor). Gears will then
be shifted to the optimum position.
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000001327308
On Board Diagnosis LogicINFOID:0000000001327309
Diagnostic trouble code “P1772 LC/B SOLENOID/CIRC” with CONSULT-III or 7th judgement flicker without
CONSULT-III is detected when TCM detects an improper voltage drop when it tries to operate the solenoid
valve.
Possible CauseINFOID:0000000001327310
 Harness or connectors
(Solenoid circuit is open or shorted.)
 Low coast brake solenoid valve
DTC Confirmation ProcedureINFOID:0000000001327311
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays 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 MONI TOR” 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-151, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis ProcedureINFOID:0000000001327312
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Turn ignition switch ON.
2. Select “SELECTION FROM MENU” in “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start engine.
4. Read out the value of “ON OFF SOL” while driving.
Item name Condition Display value
ON OFF SOL Low coast brake engaged. Refer to
AT- 1 8
.ON
Low coast brake disengaged. Refer to AT- 1 8
.OFF
Item name Condition Display value
ON OFF SOLLow coast brake engaged. Refer to
AT- 1 8
.ON
Low coast brake disengaged. Refer to AT- 1 8
.OFF
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DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTIONAT-153
< SERVICE INFORMATION >
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DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
DescriptionINFOID:0000000001327313
 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 positi on sensor (throttle position sensor). Gears will then
be shifted to the optimum position.
 This is not only caused by electrical malfunction (cir cuits open or shorted) but also by mechanical malfunc-
tion such as control valve sticking, improper solenoid valve operation.
CONSULT-III Reference Val ue in Data Monitor ModeINFOID:0000000001327314
On Board Diagnosis LogicINFOID:0000000001327315
Diagnostic trouble code “P1774 LC/B SOLENOID FNCT” with CONSULT-III or 7th judgement flicker without
CONSULT-III is detected under the following conditions.
 When TCM detects that actual gear ratio is irr egular, 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 CauseINFOID:0000000001327316
 Harness or connectors
(Solenoid and switch circuits are open or shorted.)
 Low coast brake solenoid valve
 ATF pressure switch 2
DTC Confirmation ProcedureINFOID:0000000001327317
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays 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 “TRANS MISSION” with CONSULT-III. If DTC (P1774) is
detected, go to AT-153, "
Diagnosis Procedure".
If DTC (P1772) is detected, go to AT-151, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis ProcedureINFOID:0000000001327318
1.CHECK INPUT SIGNALS
Item name Condition Display value
ON OFF SOLLow coast brake engaged. Refer to
AT- 1 8
.ON
Low coast brake disengaged. Refer to AT- 1 8
.OFF
ATF PRES SW 2 Low coast brake engaged. Refer to
AT- 1 8
.ON
Low coast brake disengaged. Refer to AT- 1 8
.OFF
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AT-154
< SERVICE INFORMATION >
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
With CONSULT-III
1. Start engine.
2. Select “SELECTION FROM MENU” in “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III.
3. Drive vehicle in the manual mode (1st or 2nd 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-160
.
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 the control valve with TCM. Refer to AT-215, "Control Valve with TCM and A/T Fluid Tem-
perature Sensor 2".
NG >> Repair or replace damaged parts.
4.CHECK DTC
Perform AT-153, "
DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
Item name Condition Display value
ON OFF SOL Low coast brake engaged. Refer to
AT- 1 8
.ON
Low coast brake disengaged. Refer to AT- 1 8
.OFF
ATF PRES SW 2 Low coast brake engaged. Refer to
AT- 1 8
.ON
Low coast brake disengaged. Refer to AT- 1 8
.OFF
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AT-164
< SERVICE INFORMATION >
CLOSED THROTTLE POSITION AND WIDE OPEN THROTTLE POSITION CIR-
CUIT
CLOSED THROTTLE POSITION AND WIDE OPEN THROTTLE POSITION
CIRCUIT
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001327353
Diagnosis ProcedureINFOID:0000000001327354
1.CHECK CAN COMMUNICATION LINE
With CONSULT-III
 Perform the self-diagnosis.
Without CONSULT-III
 Perform the self-diagnosis. Refer to AT-91, "
Diagnosis Procedure without CONSULT-III".
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to AT- 9 4.
NO >> GO TO 2.
2.CHECK THROTTLE POSI TION SIGNAL CIRCUIT
With CONSULT-III
1. Turn ignition switch ON.
2. Select “ECU INPUT SIGNALS” in “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III.
3. Depress accelerator pedal and read out the value of “CLSD THL POS” and “W/O THL POS”.
OK or NG
OK >> INSPECTION END
NG >> Check the following items. If NG, repair or replace damaged parts.
 Perform the self-diagnosis for “ENG INE” with CONSULT-III. Refer to EC-117, "
CONSULT-III
Function (ENGINE)"(for VQ35DE) or EC-695, "CONSULT-III Function (ENGINE)"(for VK45DE).
 Open circuit or short to ground or shor t to power in harness or connectors.
 Pin terminals for damage or loos e connection with harness connector.
Item name Condition Display value
CLSD THL POS Released accelerator pedal. ON
Fully depressed accelerator pedal. OFF
W/O THL POS Fully depressed accelerator pedal. ON
Released accelerator pedal. OFF
Accelerator Pedal Operation Monitor Item
CLSD THL POS W/O THL POS
Released ON OFF
Fully depressed OFF ON
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AT-166
< SERVICE INFORMATION >
A/T INDICATOR CIRCUIT
A/T INDICATOR CIRCUIT
DescriptionINFOID:0000000001327357
TCM sends the switch signals to unified meter and A/C amp. by CAN communication line. Then manual mode
switch position is indicated on the A/T indicator.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001327358
Diagnosis ProcedureINFOID:0000000001327359
1.CHECK INPUT SIGNALS
With CONSULT-III
1. Start engine.
2. Select “MAIN SIGNALS” in “DATA MONITOR” m ode for “TRANSMISSION” with CONSULT-III and read
out the value of “GEAR”.
3. Drive vehicle in the manual mode, and confirm that the actual gear position and the meter's indication of
the position mutually coincide when the selector lever is shifted to the “+ (up)” or “- (down)” side (1st ⇔ 5th
gear).
OK or NG
OK >> INSPECTION END
NG >> Check the following.
A/T INDICATOR SYMPTOM CHART
Item name Condition Display value
GEAR During driving 1, 2, 3, 4, 5
Items Presumed Location of Trouble
The actual gear position does not change, or shifting into the man-
ual mode is not possible (no gear shifting in the manual mode pos-
sible).
The A/T indicator is not indicated. Manual mode switch
 Refer to
AT- 1 5 5
.
A/T main system (Fail-safe function actuated)
 Refer to AT- 8 4 , "
CONSULT-III Function (TRANSMISSION)".
The actual gear position changes, but the A/T indicator is not indi-
cated. Perform the self-diagnosis function.
 Refer to
AT- 8 4 , "
CONSULT-III Function (TRANSMISSION)".
The actual gear position and the indication on the A/T indicator do
not coincide. Perform the self-diagnosis function.
 Refer to
AT- 8 4 , "
CONSULT-III Function (TRANSMISSION)".
Only a specific position or positions is/are not indicated on the A/
T indicator. Check the unified meter and A/C amp.
 Refer to
DI-5
.
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AT-170
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYMPTOMS
A/T Check Indicator Lamp Does Not Come On
INFOID:0000000001327361
SYMPTOM:
A/T CHECK indicator lamp does not come on for ab out 2 seconds when turning ignition switch to
“ON”.
DIAGNOSTIC PROCEDURE
1.CHECK CAN COMMUNICATION LINE
With CONSULT-III
 Perform self-diagnosis.
Without CONSULT-III
 Perform self-diagnosis. Refer to AT-91, "
Diagnosis Procedure without CONSULT-III".
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to AT- 9 4.
NO >> GO TO 2.
2.CHECK A/T CHECK INDICATOR LAMP CIRCUIT
Check the combination meter. Refer to DI-5
.
OK or NG
OK >> GO TO 3
NG >> Repair or replace damaged parts.
3.CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to AT-160
.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.
Engine Cannot Be Started in "P" or "N" PositionINFOID:0000000001327362
SYMPTOM:
Engine cannot be started with select or lever in “P” or “N” position.
 Engine can be started with selector lever in “D”or “R” position.
DIAGNOSTIC PROCEDURE
1.CHECK PNP SWITCH CIRCUIT
With CONSULT-III
 Perform self-diagnosis.
Without CONSULT-III
 Perform self-diagnosis. Refer to AT-91, "
Diagnosis Procedure without CONSULT-III".
Do the self-diagnosis results indicate PNP switch?
YES >> Check the malfunctioning system. Refer to AT-102.
NO >> GO TO 2.
2.CHECK A/T POSITION
7OR Back-up lamp re-
lay Selector lever in “R” position. 0 V
Selector lever in other positions. Battery voltage
8 P CAN-L – –
Te r m i n a l
Wire
color Item Condition Data (Approx.)
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TROUBLE DIAGNOSIS FOR SYMPTOMSAT-173
< SERVICE INFORMATION >
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OK or NG
OK >> INSPECTION END
NG >> GO TO 6.
6.CHECK TCM
1. Check TCM input/output signals. Refer to AT-83, "
TCM Input/Output Signal Reference Value".
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness
connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.
Large Shock ("N" to "D" Position)INFOID:0000000001327365
SYMPTOM:
A noticeable shock occurs when the selector lever is shifted from “N” to “D” position.
DIAGNOSTIC PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
With CONSULT-III
 Perform self-diagnosis.
Without CONSULT-III
 Perform self-diagnosis. Refer to AT-91, "
Diagnosis Procedure without CONSULT-III".
Is any malfunction detected by self-diagnostic results?
YES >> Check the malfuncti oning system. Refer to AT-84, "CONSULT-III Function (TRANSMISSION)",
AT-91, "
Diagnosis Procedure without CONSULT-III".
NO >> GO TO 2.
2.ENGINE IDLE SPEED
Check the engine idle speed. Refer to EC-84, "
Idle Speed and Ignition Timing Check" (for VQ35DE) or EC-
661, "Idle Speed and Ignition Timing Check" (for VK45DE).
OK or NG
OK >> GO TO 3.
NG >> Adjust engine idle speed. Refer to EC-84, "
Idle Speed and Ignition Timing Check" (for VQ35DE)
or EC-661, "
Idle Speed and Ignition Timing Check" (for VK45DE).
3.CHECK A/T POSITION
Check the A/T position. Refer to AT-207, "
Checking of A/T Position".
OK or NG
OK >> GO TO 4.
NG >> Adjust A/T position. Refer to AT-207, "
Adjustment of A/T
Position".
4.CHECK A/T FLUID LEVEL
SCIA2119E
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