DTC P1791 LINE PRESSURE SENSOR — Diagnostic Procedure
AT-7109flowchartSource has spelling glitches preserved verbatim: 'Whitout CONSULT-II' (step 1 OK row) and 'shortor or open' (NG branch on step 3).
Diagnostic Procedure
1
1. CHECK LINE PRESSURE SENSOR — Refer to "Component Inspection" AT-7110.
OK (Without CONSULT-II)
3. CHECK INPUT SIGNAL (Without CONSULT-II) — Refer to "Component Inspection", AT-7110.
NG
Repair or replace output pulley speed sensor.
OK (With CONSULT-II)
2
2. CHECK POWER SOURCE CIRCUIT (With CONSULT-II) — Start engine. Select "ECU Input Item Parameter List" in "DATA MONITOR" mode for "CVT" with CONSULT-II. Read out the value of "LINE PRESS SEN" while driving. Check the value changes according to driving speed. Specification: Approximately 0.5 - 5.5 MPa.
NG
Check the following items: Harness for short or open between TCM, ECM and output pulley speed sensor (Main-harness); Ground circuit for ECM. Refer to EC section ("TROUBLE DIAGNOSIS FOR POWER SUPPLY").
Check the following items: Harness for short or open between TCM, ECM and output pulley speed sensor (Main-harness); Ground circuit for ECM. Refer to EC section ("TROUBLE DIAGNOSIS FOR POWER SUPPLY").
OK
3
4. CHECK DTC — Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-7106.
NG
1. Perform TCM input/output signal inspection. 2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK
4
INSPECTION END