Code No. C1403:
Mode switch failure
OPERATION
- When the transfer-ECU measures 0 V at the drive mode-selector position which
the driver selects, it will determine that the appropriate position is turned on. When the ECU
measures system voltage at the other selector positions, it will determine that the other positions
are turned off.
System voltage is applied to the drive mode-selector when the ignition switch is turned
ON.
- System voltage is applied to the transfer-ECU when the drive mode-selector is in
the "2H," "4H," "4HLc" or "4LLc." The transfer-ECU judges that the drive mode-selector is in
the "2H," "4H," "4HLc" or "4LLc" when the system voltage is applied.
DIAGNOSIS CODE SET CONDITIONS
In the case that the input signal from the drive mode-selector is open or shorted, code
No.C1403 is set as the open circuit or the short circuit of the drive mode-selector system.
PROBABLE CAUSES
- Malfunction of the drive mode-selector
- Damaged harness wires and connectors
- Malfunction of the transfer-ECU
|
|
STEP 1. M.U.T.-III data list
|
|
|
Use the transfer-ECU service data to check the signals related to the operation of drive
mode-selector.
|
|
|
- Turn the drive mode-selector to the "2H" position.
|
|
|
Item No.
|
Item name
|
Normal condition
|
34
|
T/F select switch (2H)
|
ON
|
35
|
T/F select switch (4HLc)
|
OFF
|
36
|
T/F select switch (4LLc)
|
OFF
|
37
|
T/F select switch (4H)
|
OFF
|
|
|
|
- Turn the drive mode-selector to the "4HLc" position.
|
|
|
Item No.
|
Item name
|
Normal condition
|
34
|
T/F select switch (2H)
|
OFF
|
35
|
T/F select switch (4HLc)
|
ON
|
36
|
T/F select switch (4LLc)
|
OFF
|
37
|
T/F select switch (4H)
|
OFF
|
|
|
|
- Turn the drive mode-selector to the "4LLc" position.
|
|
|
Item No.
|
Item name
|
Normal condition
|
34
|
T/F select switch (2H)
|
OFF
|
35
|
T/F select switch (4HLc)
|
OFF
|
36
|
T/F select switch (4LLc)
|
ON
|
37
|
T/F select switch (4H)
|
OFF
|
|
|
|
- Turn the drive mode-selector to the "4H" position.
|
|
|
Item No.
|
Item name
|
Normal condition
|
34
|
T/F select switch (2H)
|
OFF
|
35
|
T/F select switch (4HLc)
|
OFF
|
36
|
T/F select switch (4LLc)
|
OFF
|
37
|
T/F select switch (4H)
|
ON
|
|
|
|
OK: Normal condition are displayed.
|
|
|
Q.
Are the check result normal?
|
|
|
 The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction  ).
|
|
|
|
|
|
 Go to Step 2.
|
|
|
|
|
|
STEP 2. Check the drive mode-selector.
|
|
|
Refer to .
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 3.
|
|
|
|
|
|
Replace the drive mode-selector (Refer to ).
|
|
|
|
|
|
STEP 3. Resistance measurement at the drive mode-selector connector
(earth terminal).
|
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
|
(2)Measure the resistance between the drive mode-selector connector (earth terminal)
and body earth.
|
|
|
(3)OK: Continuity exists (2 Ω or less)
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 5.
|
|
|
|
|
|
Go to Step 4.
|
|
|
|
|
|
STEP 4. Check of open circuit in earth line between the drive mode-selector
connector and body earth.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 5.
|
|
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
|
|
STEP 5. Check of short to power supply, short to earth, and open circuit
in 2H line between transfer-ECU and drive mode-selector connector.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 6.
|
|
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
|
|
STEP 6. Check of short to power supply, short to earth, and open circuit
in 4HLc line between transfer-ECU and drive mode-selector connector.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 7.
|
|
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
|
|
STEP 7. Check of short to power supply, short to earth, and open circuit
in 4LLc line between transfer-ECU and drive mode-selector connector.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 8.
|
|
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
|
|
STEP 8. Check of short to power supply, short to earth, and open circuit
in 4H line between transfer-ECU and drive mode-selector connector.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 9.
|
|
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
|
|
STEP 9. Retest the system
|
|
|
Check that the drive mode-selector functions work normally.
|
|
|
Q.
Is the check result normal?
|
|
|
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction ).
|
|
|
|
|
|
Replace the transfer-ECU (Refer to ).
|
|
|
|