Code No.P0828: Shift Switch (Up Switch/Down Switch) System
PROBABLE CAUSES
- Malfunction of shift switch
- Damaged harness wires and connectors
- Malfunction of the A/T-ECU
OPERATION
The shift switch detects the up shift/down shift which the driver has selected, and sends the information to the A/T-ECU.
COMMENTS ON TROUBLE SYMPTOM
While the engine is running, when the select switch is other than the sport mode, if the UP/DOWN signal from shift switch is detected continuously for 10 seconds, code No. P0828 is set.
PROBABLE CAUSES
- Malfunction of shift switch
- Damaged harness wires and connectors
- Malfunction of the A/T-ECU
|
|
STEP 1. M.U.T.-III data list
|
|
|
- Item 20: Shift lever switch (UP)
- Item 21: Shift lever switch (DOWN)
|
|
|
Check the above data list (Refer to  ).
|
|
|
Q.
Is the check result normal?
|
|
|
 Go to Step 8.
|
|
|
|
|
|
NO "NG" for item 20 : Go to Step 2.
|
|
|
|
|
|
NO "NG" for item 21 : Go to Step 5.
|
|
|
|
|
|
STEP 2. Measure the voltage at A/T-ECU connector
|
|
|
(1)Disconnect the connector, and measure the voltage between terminal UPSW line and body earth at the wiring harness side.
|
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
|
(3)Selector lever position: Upshift and hold the selector lever.
OK: System voltage
|
|
|
(4)Selector lever position: Other than above.
OK: 1 V or less
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 8.
|
|
|
|
|
|
 Go to Step 3.
|
|
|
|
|
|
STEP 3. Check for short circuit in UPSW line between shift switch assembly connector and A/T-ECU connector.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 4.
|
|
|
|
|
|
Repair the connector(s) or the wiring harness.
|
|
|
|
|
|
STEP 4. Check the shift switch (Up switch).
|
|
|
Refer to .
|
|
|
Q.
Is the check result normal?
|
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
|
|
|
|
|
|
Replace the selector lever assembly.
|
|
|
|
|
|
STEP 5. Measure the voltage at A/T-ECU connector.
|
|
|
(1)Disconnect the connector, and measure the voltage between terminal DWSW line and body earth at the wiring harness side.
|
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
|
(3)Selector lever position: Downshift and hold the selector lever.
OK: System voltage
|
|
|
(4)Selector lever position: Other than above.
OK: 1 V or less
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 8.
|
|
|
|
|
|
Go to Step 6.
|
|
|
|
|
|
STEP 6. Check for short circuit in DWSW line between shift switch assembly connector and A/T-ECU connector.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 7.
|
|
|
|
|
|
Repair the connector(s) or the wiring harness.
|
|
|
|
|
|
STEP 7. Check the shift switch (Down switch).
|
|
|
Refer to .
|
|
|
Q.
Is the check result normal?
|
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
|
|
|
|
|
|
Replace the selector lever assembly.
|
|
|
|
|
|
STEP 8. Check whether the diagnosis code is set again.
|
|
|
- Ignition switch: "LOCK"(OFF) → "ON"
- Check again if the diagnosis code is set.
|
|
|
Q.
Is diagnosis code No.P0828 set?
|
|
|
Replace the A/T-ECU.
|
|
|
|
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
|
|
|
|