Nissan Altima 2007-2012 Service Manual: P1777 step motor
Description
The step motor changes the step with turning 4 coils ON/OFF according to the signal from TCM. As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled.
DTC Logic
DTC DETECTION LOGIC
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.
Then wait at least 10 seconds before performing the next test.
1.CHECK DTC DETECTION
1. Start engine.
2. Drive vehicle for at least 5 consecutive seconds.
3. Perform “SELF-DIAG RESULTS” mode for “TRANSMISSION”.
Follow the procedure “With CONSULT-III”.
Is “P1777 STEP MOTR CIRC” detected? YES >> Go to TM-184, "Diagnosis Procedure".
NO >> Check intermittent incident. Refer to GI-42, "Intermittent Incident".
Diagnosis Procedure
1.CHECK STEP MOTOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect TCM harness connector.
3. Check resistance between TCM harness connector F16 terminal 27, 29 and 28, 30.
4. Check resistance between TCM harness connector F16 terminal 27, 28, 29, 30 and ground.
Is the inspection result normal? YES >> GO TO 5.
NO >> GO TO 2.
2.CHECK HARNESS BETWEEN TCM AND CVT UNIT (STEP MOTOR) (PART 1)
1. Disconnect CVT unit harness connector.
2. Check continuity between TCM harness connector F16 (A) terminal 27, 28, 29, 30 and CVT unit harness connector F46 (B) terminal 9, 8, 7, 6.
Is the inspection result normal? YES >> GO TO 3.
NO >> Repair or replace damaged parts.
3.CHECK HARNESS BETWEEN TCM AND CVT UNIT (STEP MOTOR) (PART 2)
Check continuity between TCM harness connector F16 terminal 27, 28, 29, 30 and ground.
Is the inspection result normal? YES >> GO TO 4.
NO >> Repair or replace damaged parts.
4.CHECK STEP MOTOR
Check step motor. Refer to TM-186, "Component Inspection (Step Motor)".
Is the inspection result normal? YES >> GO TO 5.
NO >> Replace transaxle assembly. Refer to TM-259, "Exploded View".
5.DETECT MALFUNCTIONING ITEMS
Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
Component Inspection (Step Motor)
1.CHECK STEP MOTOR
1. Check resistance between CVT unit terminal 6, 8 and 7, 9.
2. Check resistance between CVT unit terminal 6, 7, 8, 9 and ground.
Is the inspection result normal? YES >> INSPECTION END
NO >> Replace transaxle assembly. Refer to TM-259, "Exploded View".
P1745 line pressure control
Description
The pressure control solenoid valve A (line pressure solenoid valve)
regulates the oil pump discharge pressure
to suit the driving condition in response to a signal sent from the TCM. ...
P1778 step motor - function
Description
• The step motor's 4 aspects of ON/OFF change according to the signal from
TCM. As a result, the flow of line
pressure to primary pulley is changed and pulley ratio is controlled.
...
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valve
Description
The EVAP canister vent control valve is located on the EVAP canister
and is used to seal the canister vent.
This solenoid valve responds to signals from the ECM. When the
ECM sends an ON signal, the coil in the solenoid valve is energized.
A plunger will then move to seal the ca ...
P2135 TP Sensor
Description
Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
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Front door glass
Components
1. Door
2. Inside seal
3. Door glass
4. Regulator assembly
5. Door module assembly
6. Window motor
7. Cover
Removal and Installation
REMOVAL
1. Remove the front door finisher. Refer to INT-12, "Removal and
Installation".
2. Remove the bolt hole covers.
3. R ...