Code No.15 Auto-cruise
Control Switch System
OPERATION
This circuit judges the signals of each switch
(SET, RESUME and CANCEL) of the auto-cruise
control switch. The engine-A/T-ECU detects the state of the
auto-cruise control switch
by sensing the voltages shown below.
- When all switches are OFF: 4.7 - 5.0 volts
- When the MAIN switch is ON: 0 - 0.3 volt
- When the SET switch is ON: 2.0 - 2.8 volts
- When the RESUME switch is ON: 3.3 - 4.1 volts
- When the CANCEL switch is ON: 0.8 - 1.5 volts
DIAGNOSIS CODE SET CONDITIONS
If the auto-cruise control
switch is operated, this diagnosis code will be set when the
engine-A/T-ECU terminal voltage is different from the standard
value.
POSSIBLE CAUSES
- Malfunction of the auto-cruise control switch.
- Malfunction of the clock spring.
- Damaged harness or connector.
- Malfunction of the engine-A/T-ECU.
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STEP 1. M.U.T.-III data list
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- Item 01: Main switch (Refer to data list reference
table
 ).
- Item 02: Set switch (Refer to data list reference
table ).
- Item 03: Resume switch (Refer to data list reference
table ).
- Item 04: Cancel switch (Refer to data list reference
table ).
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Q.
Is the check result normal?
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 Go to Step
17.
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 Go to Step
2.
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STEP 2. Measure the voltage at auto-cruise control
switch connector
C-305.
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(1)Remove the air bag module (driver’s side)
(Refer to GROUP 52B, Driver’s,
Front Passenger’s Air Bag Module(s) and Clock Spring ).
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(2)Connect the negative (-) battery
cable.
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(3)Turn the ignition switch to the "ON" position and
the MAIN switch to the "OFF"
position.
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(4)Measure the voltage between
connector C-305 terminal No.2 and earth.
OK:
4.7-5.0 V
(5)Turn the ignition switch to
the "LOCK" (OFF) position.
Q.
Is the check result normal?
Go to Step
9.
Go to Step
3.
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STEP 3. Measure the voltage at engine-A/T-ECU connector
C-113.
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(1)Turn the ignition switch to the "ON" position and
the MAIN switch to the "OFF"
position.
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(2)Measure the voltage between
engine-A/T-ECU connector C-113 terminal No.94 and
earth.
OK: 4.7-5.0 V
(3)Turn the
ignition switch to the "LOCK" (OFF) position.
Q.
Is the check result normal?
Go to Step
6.
Go to Step
4.
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STEP 4. Connector check: C-113 engine-A/T-ECU
connector
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Q.
Is the check result normal?
Go to Step
5.
Repair or
replace the faulty connector, and install the air bag module
(driver’s
side) (Refer to GROUP 52B, Driver’s, Front
Passenger’s Air Bag Module(s)
and Clock Spring ). Then go
to Step 18.
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STEP 5. Check the harness between engine-A/T-ECU
connector C-113 terminal
No.94 and the auto-cruise control switch connector C-305
terminal No.2.
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(1)Disconnect engine-A/T-ECU
connector C-113 and measure at the harness connector
side.
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(2)Measure the continuity between
engine-A/T-ECU connector C-113 terminal No.94 and
earth.
(3)Connect engine-A/T-ECU connector
C-113.
Q.
Is the measured continuity open circuit?
Install the
air bag module (driver’s side) (Refer to GROUP 52B,
Driver’s,
Front Passenger’s Air Bag Module(s) and Clock Spring
).
Then go to Step 17.
Go to Step
6.
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STEP 6. Connectors check: C-305 auto-cruise control
switch connector,
C-17 and C-304 intermediate connectors, C-310 and C-311
clock spring connectors
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Q.
Is the check result normal?
Go to Step
7.
Repair or
replace the faulty connector, and install the air bag module
(driver’s
side) (Refer to GROUP 52B, Driver’s, Front
Passenger’s Air Bag Module(s)
and Clock Spring ). Then go
to Step 18.
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STEP 7. Check the harness between engine-A/T-ECU
connector C-113 terminal
No.94 and the auto-cruise control switch connector C-305
terminal No.2.
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Q.
Is the check result normal?
Go to Step
8.
Repair the
damaged harness wire, and install the air bag module
(driver’s
side) (Refer to GROUP 52B, Driver’s, Front
Passenger’s Air Bag Module(s)
and Clock Spring ). Then go
to Step 18.
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STEP 8. Check the clock spring.
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Refer to GROUP 52B, Driver’s,
Front Passenger’s Air Bag Module(s) and
Clock Spring .
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Q.
Is the check result normal?
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It can be
assumed that this malfunction is intermittent, and install
the air bag
module (driver’s side) (Refer to GROUP 52B,
Driver’s, Front Passenger’s
Air Bag Module(s) and Clock Spring ). Then go
to Step 18.
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Replace the
clock spring and install the air bag module (driver’s
side)
(Refer to GROUP 52B, Driver’s, Front Passenger’s
Air Bag Module(s) and Clock
Spring ). Then go
to Step 18.
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STEP 9. Measure the voltage at auto-cruise control
switch connector
C-305.
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(1)Turn the ignition switch to the "ON" position and
the MAIN switch to the "ON" position.
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(2)Measure the voltage between
connector C-305 terminal No.3 and earth.
OK:
0.3 V or less
(3)Turn the MAIN switch to the
"OFF" position and the ignition switch to the "LOCK"
(OFF) position.
Q.
Is the check result normal?
Go to Step
15.
Go to Step
10.
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STEP 10. Measure the voltage at engine-A/T-ECU connector
C-114.
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(1)Turn the ignition switch to the "ON" position and
the MAIN switch to the "ON" position.
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(2)Measure the voltage between
engine-A/T-ECU connector C-114 terminal No.146 and
earth.
OK: 0.3 V or less
(3)Turn the
MAIN switch to the "OFF" position and the ignition switch to
the "OFF"
position.
Q.
Is the check result normal?
Go to Step
12.
Go to Step
11.
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STEP 11. Connector check: C-114 engine-A/T-ECU
connector
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Q.
Is the check result normal?
Install the
air bag module (driver’s side) (Refer to GROUP 52B,
Driver’s,
Front Passenger’s Air Bag Module(s) and Clock Spring
).
Then go to Step 17.
Repair or
replace the faulty connector, and install the air bag module
(driver’s
side) (Refer to GROUP 52B, Driver’s, Front
Passenger’s Air Bag Module(s)
and Clock Spring ). Then go
to Step 18.
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STEP 12. Connectors check: C-114 engine-A/T-ECU
connector, C-17 and
C-304 intermediate connector, C-305 auto-cruise control
switch connector, C-310 and C-311 clock
spring connectors
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Q.
Is the check result normal?
Go to Step
13.
Repair or
replace the faulty connector, and install the air bag module
(driver’s
side) (Refer to GROUP 52B, Driver’s, Front
Passenger’s Air Bag Module(s)
and Clock Spring ). Then go
to Step 18.
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STEP 13. Check the harness between engine-A/T-ECU
connector C-114
terminal No.146 and the auto-cruise control switch
connector C-305 terminal No.3.
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Q.
Is the check result normal?
Go to Step
14.
Repair the
damaged harness wire, and install the air bag module
(driver’s
side) (Refer to GROUP 52B, Driver’s, Front
Passenger’s Air Bag Module(s)
and Clock Spring ). Then go
to Step 18.
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STEP 14. Check the clock spring.
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Refer to GROUP 52B, Driver’s,
Front Passenger’s Air Bag Module(s) and
Clock Spring .
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Q.
Is the check result normal?
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It can be
assumed that this malfunction is intermittent, and install
the air bag
module (driver’s side) (Refer to GROUP 52B,
Driver’s, Front Passenger’s
Air Bag Module(s) and Clock Spring ). Then go
to Step 18.
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Replace the
clock spring and install the air bag module (driver’s
side)
(Refer to GROUP 52B, Driver’s, Front Passenger’s
Air Bag Module(s) and Clock
Spring ). Then go
to Step 18.
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STEP 15. Connector check: C-305 auto-cruise control
switch connector
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Q.
Is the check result normal?
Go to Step
16.
Repair or
replace the faulty connector, and install the air bag module
(driver’s
side) (Refer to GROUP 52B, Driver’s, Front
Passenger’s Air Bag Module(s)
and Clock Spring ). Then go
to Step 18.
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STEP 16. Check the auto-cruise control
switch.
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Refer to .
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Q.
Is the check result normal?
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Install the
air bag module (driver’s side) (Refer to GROUP 52B,
Driver’s,
Front Passenger’s Air Bag Module(s) and Clock Spring
).
Then go to Step 17.
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Replace the
auto-cruise control switch (Refer to ),
and install the air bag module (driver’s side) (Refer
to GROUP 52B, Driver’s,
Front Passenger’s Air Bag Module(s) and Clock Spring
).
Then go to Step 18.
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STEP 17. Check the M.U.T.-III diagnosis code
No.15.
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Q.
Is the M.U.T.-III diagnosis code No.15 output?
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Replace the
engine-A/T-ECU (Refer to GROUP 13A, Engine-ECU and
Engine-A/T-ECU ).
Then go to Step 18 .
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It can be assumed
that this malfunction is intermittent.
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STEP 18. Check the M.U.T.-III diagnosis code
No.15.
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Q.
Is the M.U.T.-III diagnosis code No.15 output?
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Return to
Step 1.
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The procedure is
complete.
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