P0780

DTC P0780 SHIFT

Description
- This malfunction will not be detected while the A/T CHECK indicator lamp is indicating another self-diagnosis malfunction.
- This malfunction is detected when the A/T does not shift as instructed by the TCM. This is not caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such as control valve sticking, improper solenoid valve operation, etc.

On Board Diagnosis Logic
- This is an OBD-II self-diagnostic item.
- Diagnostic trouble code "SHIFT" with CONSULT-II or P0780 without CONSULT-II is detected under the following conditions.
- When no rotation change occurs between input (turbine revolution sensor) and output (revolution sensor) and shifting time is long.
- When shifting ends immediately.
- When engine revs up unusually during shifting.

Possible Cause
- Shift solenoid valve D (Off error.)
- Shift solenoid valve E (Off error.)
- Pressure control solenoid valve A (On/Off error.)
- Pressure control solenoid valve B (On/Off error.)
- Pressure control solenoid valve C (On/Off error.)
^ Hydraulic control circuit

DTC Confirmation Procedure

CAUTION:
- Always drive vehicle at a safe speed.
- Be careful not to rev engine into the red zone on the tachometer.

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-II





1. Start engine and select "A/T" with "DATA MONITOR" mode in CONSULT-II.
2. Make sure that ATF temperature is within the range below.
FLUID TEMP: More than 60°C (140°F)
If out of range, drive the vehicle to warm up the fluid.
3. Drive vehicle and allow the following conditions.
SLCT LVR POSI: "D" position
GEAR: 1st -> 2nd -> 3rd -> 4th -> 5th position
(Vehicle speed: Refer to "VEHICLE SPEED WHEN SHIFTING GEARS".)
4. If DTC is detected, go to AT-187. "Diagnostic Procedure".

WITH GST
Follow the procedure "With CONSULT-II".

AT-SFTFNC-01:

AT-SFTFNC-02:

AT-SFTFNC:

Wiring Diagram-AT-SFTFNC

Diagnostic Procedure
1. CHECK EACH SHIFT SOLENOID VALVE CIRCUIT
Perform "Diagnostic Procedure" for the following DTCs.
- "DTC P0765 SHIFT SOLENOID VALVE D" (Refer to AT-171. "Diagnostic Procedure".) P0765
- "DTC P0770 SHIFT SOLENOID VALVE E" (Refer to AT-176. "Diagnostic Procedure".) P0770
OK or NG
OK >>GO TO 2.
NG >>Repair or replace damaged parts.

2. CHECK EACH PRESSURE CONTROL SOLENOID VALVE CIRCUIT
Perform "Diagnostic Procedure" for the following DTCs.
- "DTC P0745 PRESSURE CONTROL SOLENOID VALVE A" (Refer to AT-146 "Diagnostic Procedure".) P0745
- "DTC P0775 PRESSURE CONTROL SOLENOID VALVE B" (Refer to AT-181. "Diagnostic Procedure".) P0775
- "DTC P0795 PRESSURE CONTROL SOLENOID VALVE C" (Refer to AT-190 "Diagnostic Procedure".) P0795
OK or NG
OK >>GO TO 3.
NG >>Repair or replace damaged parts.

3. CHECK DTC
Perform "DTC Confirmation Procedure". Refer to AT-184. "DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >>Replace the control valve assembly. Refer to "Control Valve Assembly".