A/T Does Not Shift: D4 ---> D3, When OD Off
A/T Does Not Shift: D4 ---> D3, When OD OFFSYMPTOM: A/T does not shift from D4 to D3 when OD OFF (OD OFF indicator lamp is on) on "Cruise Test - Part 3".
DIAGNOSTIC PROCEDURE
1. CHECK CAN COMMUNICATION LINE
Perform self-diagnosis. Refer to AT-73, "CONSULT-III Function (A/T)" or AT-78, "Diagnosis Procedure without CONSULT-III".
Consult-III Function (A/T)
Diagnosis Procedure Without Consult-III
Is a malfunction in CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to AT-83. U1000
NO >> GO TO 2.
2. CHECK OVERDRIVE CONTROL SWITCH CIRCUIT
With CONSULT-III
1. Turn ignition switch ON. (Do not start engine)
2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-III.
3. Read out "OVERDRIVE SW".
Check the signal of the overdrive control switch is indicated properly.
Without CONSULT-III
1. Turn ignition switch ON. (Do not start engine)
2. Check voltage between A/T device harness connector terminal and ground.
OK or NG
OK >> Go to AT-186, "A/T Does Not Shift: D2 ---> D3". A/T Does Not Shift: D2 ---> D3
NG >> Check overdrive control switch. Refer to AT-171, "Component Inspection". PNP, OD Switch and Closed Throttle, Wide Open Throttle Position Signal Circuit