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
With CONSULT-III
Start engine.
Drive vehicle for at least 5 consecutive seconds.
Perform "SELF-DIAG RESULTS" mode for "TRANSMISSION". With GST
Check resistance between TCM harness connector F16 terminal 27, 29 and 28, 30.
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)
Disconnect CVT unit harness connector.
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 Component Inspection (Step Motor).
Is the Inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5. 5.CHECK DTC
With CONSULT-III
Turn ignition switch ON.
Perform "SELF-DIAG RESULTS" mode for "TRANSMISSION". Is "P1777 STEP MOTOR CIRC" detected?