ASCD BRAKE SWITCH
ASCD BRAKE SWITCH PFP:25320
Component Description UBS00KWD
When the brake pedal is depressed, ASCD brake switch is turned
OFF and stop lamp switch is turned ON. ECM detects the state of
the brake pedal by this input of two kinds (ON/OFF signal).
Refer to EC-29, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)"
for the ASCD function.
BBIA0087E
CONSULT-II Reference Value in Data Monitor Mode UBS00KWE
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
BRAKE SW 1 Brake pedal: Fully released ON
● Ignition switch: ON
(ASCD brake switch) Brake pedal: Slightly depressed OFF
BRAKE SW 2 Brake pedal: Fully released OFF
● Ignition switch: ON
(Stop lamp switch) Brake pedal: Slightly depressed ON
Revision: October 2004 EC-626 2005 Titan
ASCD BRAKE SWITCH
Wiring Diagram UBS00KWF
EC
BBWA1724E
Revision: October 2004 EC-627 2005 Titan
ASCD BRAKE SWITCH
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TER-
WIRE
MINAL ITEM CONDITION DATA (DC Voltage)
COLOR
NO.
[Ignition switch: OFF]
Approximately 0V
● Brake pedal: Fully released
101 R/WL Stop lamp switch
[Ignition switch: OFF] BATTERY VOLTAGE
● Brake pedal: Slightly depressed (11 - 14V)
[Ignition switch: ON] BATTERY VOLTAGE
● Brake pedal: Fully released (11 - 14V)
108 BR/W ASCD brake switch
[Ignition switch: ON]
Approximately 0V
● Brake pedal: Slightly depressed
Diagnostic Procedure UBS00KWG
1. CHECK OVERALL FUNCTION-I
With CONSULT-II
1. Turn ignition switch ON.
2. Select “BRAKE SW 1” in “DATA MONITOR” mode with CONSULT-II.
3. Check “BRAKE SW 1” indication under the following conditions.
CONDITION INDICATION
Brake pedal: Slightly depressed OFF
Brake pedal: Fully released ON
SEC011D
Without CONSULT-II
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 108 and ground under the
following conditions.
CONDITION VOLTAGE
Brake pedal: Slightly depressed Approximately 0V
Brake pedal: Fully released Battery voltage
MBIB0061E
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
Revision: October 2004 EC-628 2005 Titan
ASCD BRAKE SWITCH
2. CHECK OVERALL FUNCTION-II A
With CONSULT-II
Check “BRAKE SW 2” indication in “DATA MONITOR” mode.
EC
CONDITION INDICATION
Brake pedal: Fully released OFF
Brake pedal: Slightly depressed ON C
SEC013D E
Without CONSULT-II
Check voltage between ECM terminal 101 and ground under the following conditions. F
CONDITION VOLTAGE
Brake pedal: Fully released Approximately 0V
G
Brake pedal: Slightly depressed Battery voltage
I
PBIB1537E
OK or NG J
OK >> INSPECTION END
NG >> GO TO 7.
K
Revision: October 2004 EC-629 2005 Titan
ASCD BRAKE SWITCH
3. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Turn ignition switch ON.
BBIA0373E
4. Check voltage between ASCD brake switch terminal 1 and
ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
PBIB0857E
4. DETECT MALFUNCTIONING PART
Check the following.
● Harness connectors M31, E152
● Fuse block (J/B) connector M4
● 10A fuse
● Harness for open or short between ASCD brake switch and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 108 and ASCD brake switch terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK ASCD BRAKE SWITCH
Refer to EC-632, "Component Inspection" .
OK or NG
OK >> GO TO 11.
NG >> Replace ASCD brake switch.
Revision: October 2004 EC-630 2005 Titan
ASCD BRAKE SWITCH
7. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT A
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
EC
BBIA0373E
E
3. Check voltage between stop lamp switch terminal 1 and ground
with CONSULT -II or tester.
F
Voltage: Battery voltage
OK or NG
OK >> GO TO 9. G
NG >> GO TO 8.
H
WBIA0545E
8. DETECT MALFUNCTIONING PART I
Check the following.
● Harness connectors M31, E152 J
● Fuse block (J/B) connector M60
● 10A fuse
● Harness for open or short between stop lamp switch and battery K
>> Repair open circuit or short to ground or short to power in harness or connectors.
L
9. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector. M
2. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 10.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
10. CHECK STOP LAMP SWITCH
Refer to EC-632, "Component Inspection" .
OK or NG
OK >> GO TO 11.
NG >> Replace stop lamp switch.
Revision: October 2004 EC-631 2005 Titan
ASCD BRAKE SWITCH
11. CHECK INTERMITTENT INCIDENT
Refer to EC-153, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Component Inspection UBS00KWH
ASCD BRAKE SWITCH
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Check harness continuity between ASCD brake switch terminals
1 and 2 under the following conditions.
Condition Continuity
Brake pedal: Fully released. Should exist.
Brake pedal: Slightly depressed. Should not exist.
If NG, adjust ASCD brake switch installation, refer to BR-6,
"BRAKE PEDAL" , and perform step 3 again.
SEC023D
STOP LAMP SWITCH
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check harness continuity between stop lamp switch terminals 1
and 2 under the following conditions.
Condition Continuity
Brake pedal: Fully released. Should not exist.
Brake pedal: Slightly depressed. Should exist.
If NG, adjust stop lamp switch installation, refer to BR-6,
"BRAKE PEDAL" , and perform step 3 again.
WBIA0546E
Revision: October 2004 EC-632 2005 Titan
ASCD INDICATOR
ASCD INDICATOR PFP:24814
A
Component Description UBS00F0Z
ASCD indicator lamp illuminates to indicate ASCD operation status. Lamp has two indicators, CRUISE and
SET, and is integrated in combination meter. EC
CRUISE indicator illuminates when MAIN switch on ASCD steering switch is turned ON to indicate that ASCD
system is ready for operation.
SET indicator illuminates when following conditions are met.
C
● CRUISE indicator is illuminated.
● SET/COAST switch on ASCD steering switch is turned ON while vehicle speed is within the range of
ASCD setting.
D
SET indicator remains lit during ASCD control.
Refer to EC-29, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)" for the ASCD function.
CONSULT-II Reference Value in Data Monitor Mode UBS00F10 E
Specification data are reference value.
MONITOR ITEM CONDITION SPECIFICATION
F
● MAIN switch: Pressed at the 1st
CRUISE LAMP ● Ignition switch: ON ON → OFF
time → at the 2nd time
● MAIN switch: ON ● ASCD: Operating ON
G
SET LAMP ● When vehicle speed is
between 40 km/h (25 MPH) ● ASCD: Not operating OFF
and 144 km/h (89 MPH)
H
Revision: October 2004 EC-633 2005 Titan
ASCD INDICATOR
Wiring Diagram UBS00F11
BBWA1717E
Revision: October 2004 EC-634 2005 Titan
ASCD INDICATOR
Diagnostic Procedure UBS00F12
1. CHECK OVERALL FUNCTION A
Check ASCD indicator under the following conditions.
ASCD INDICATOR CONDITION SPECIFICATION EC
● MAIN switch: Pressed at the 1st
CRUISE LAMP ● Ignition switch: ON ON → OFF
time → at the 2nd time
C
● MAIN switch: ON ● ASCD: Operating ON
SET LAMP ● When vehicle speed is between
40 km/h (25 MPH) and 144 km/h ● ASCD: Not operating OFF
(89 MPH) D
OK or NG
OK >> INSPECTION END
NG >> GO TO 2. E
2. CHECK DTC
F
Check that DTC U1000 or U1001 is not displayed.
OK or NG
OK >> GO TO 3. G
NG >> Perform trouble diagnosis for DTC U1000, U1001. Refer to EC-160, "DTC U1000, U1001 CAN
COMMUNICATION LINE" .
3. CHECK COMBINATION METER FUNCTION H
Refer to DI-5, "COMBINATION METERS" .
OK or NG I
OK >> GO TO 4.
NG >> Go to DI-5, "COMBINATION METERS" .
J
4. CHECK INTERMITTENT INCIDENT
Refer to EC-153, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
K
>> INSPECTION END
L
Revision: October 2004 EC-635 2005 Titan
MIL AND DATA LINK CONNECTOR
MIL AND DATA LINK CONNECTOR PFP:24814
Wiring Diagram UBS00F13
BBWA1718E
Revision: October 2004 EC-636 2005 Titan
MIL AND DATA LINK CONNECTOR
EC
BBWA1719E
Revision: October 2004 EC-637 2005 Titan
