2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 714
NG - Repair or replace damaged parts.
4.CHECK DTC
Perform See: P Code Charts/P1772.
OK or NG
OK - INSPECTION END
NG - GO TO 2.
P1774
P1774 LOW COAST BRAKE SOLENOID
Description
- Low coast brake solenoid valve is turned ON or OFF by the TCM in response to signals sent from the trans- mission range switch, output
speed sensor and accelerator pedal position sensor (throttle position sensor).
Gears will then be shifted to the optimum position.
- This is not only caused by electrical malfunction (circuits open or shorted) but also by mechanical malfunction such as control valve sticking,
improper solenoid valve operation.
CONSULT-III Reference Value in Data Monitor Mode
On Board Diagnosis Logic
- This is an OBD-II self-diagnostic item.
- Diagnostic trouble code "P1774" with CONSULT-III or 7th judgment flicker without CONSULT-III is detected under the following
conditions.
- When TCM detects that actual gear ratio is irregular, 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 Cause
- Harness or connectors
(Solenoid and switch circuits are open or shorted.)
- Low coast brake solenoid valve
- ATF pressure switch 2
DTC Confirmation Procedure
CAUTION:
Always drive vehicle at a safe speed.
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. Start the engine.
2. Select "DATA MONITOR" in "TRANSMISSION".
3. Accelerate vehicle to maintain the following conditions.
MANU MODE SW: ON
GEAR: "1" or "2" (LC/B ON/OFF)
4. Perform step 3 again.
5. Turn ignition switch OFF, then perform step 1 to 4 again.
6. Check "SELF-DIAG RESULTS" in "TRANSMISSION".
If DTC (P1774) is detected, go to See: P Code Charts/P1774.
If DTC (P1772) is detected, go to See: P Code Charts/P1772.
WITH GST
Follow the procedure "WITH CONSULT-III".
