ASCD Brake Switch
ASCD BRAKE SWITCH
Component Description
When depress on the brake pedal, ASCD brake switch (2) is turned
OFF and stop lamp switch (1) is turned ON. ECM detects the state of the brake pedal by this input of two kinds (ON/OFF signal)
Refer to the ASCD function.
CONSULT Reference Value in Data Monitor Mode
Specification data are reference values.
Wiring Diagram
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 damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnosis Procedure
1. CHECK OVERALL FUNCTION-I
With CONSULT
1.Turn ignition switch ON.
2.Select "BRAKE SW-1" in "DATA MONITOR" mode with CONSULT.
3.Check "BRAKE SW-1" indication under the following conditions.
Without CONSULT
1.Turn ignition switch ON.
2.Check voltage between ECM terminal 100 and ground under the following conditions.
OK or NG
OK- GO TO 2.
NG (M/T models) -GO TO 3.
NG (A/T and CVT models) -GO TO 4.
2. CHECK OVERALL FUNCTION-II
With CONSULT
Check "BRAKE SW-2" indication in "DATA MONITOR" mode.
Without CONSULT
Check voltage between ECM terminal 99 and ground under the following conditions.
OK or NG
OK- INSPECTION END.
NG- GO TO 11.
3. CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT
1.Turn ignition switch OFF.
2.Disconnect ASCD clutch switch (1) harness connector.
3.Turn ignition switch ON.
4.Check voltage between ASCD clutch switch terminal 1 and ground under the following conditions with CONSULT or tester.
OK or NG
OK- GO TO 9.
NG- GO TO 4.
4. CHECK ASCD BRAKE SWITCH POWER SUPPLY
1.Turn ignition switch OFF.
2.Disconnect ASCD brake switch (2) harness connector.
3.Turn ignition switch ON.
4.Check voltage between ASCD brake switch terminal 1 and ground with CONSULT or tester.
Voltage: Battery voltage
OK or NG
OK (M/T models) -GO TO 6.
OK (A/T and CVT models) -GO TO 7.
NG- GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M69, E7
- 10 A 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.
6. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.Turn ignition switch OFF.
2.Check harness continuity between ASCD brake switch terminal 2 and ASCD clutch switch terminal 1.
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 8.
NG- Repair open circuit or short to ground or short to power in harness or connectors.
7. 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 100 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 8.
NG- Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK ASCD BRAKE SWITCH
P1572.
OK or NG
OK- GO TO 15.
NG- Replace ASCD brake switch. Removal And Installation.
9. CHECK ASCD CLUTCH 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 100 and ASCD clutch 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 10.
NG- Repair open circuit or short to ground or short to power in harness or connectors.
10. CHECK ASCD CLUTCH SWITCH
P1572
OK or NG
OK- GO TO 15.
NG- Replace ASCD clutch switch. Service and Repair.
11. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1.Turn ignition switch OFF.
2.Disconnect stop lamp switch (1) harness connector.
3.Check voltage between stop lamp switch terminal 1 and ground with CONSULT or tester.
Voltage: Battery voltage
OK or NG
OK- GO TO 13.
NG- GO TO 12.
12. DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M69, E7
- 10 A fuse
- Harness for open or short between stop lamp switch and battery
- Repair open circuit or short to ground or short to power in harness or connectors.
13. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.Disconnect ECM harness connector.
2.Check harness continuity between ECM terminal 99 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 14.
NG- Repair open circuit or short to ground or short to power in harness or connectors.
14. CHECK STOP LAMP SWITCH
P1572.
OK or NG
OK- GO TO 15.
NG- Replace stop lamp switch. Removal And Installation.
15. CHECK INTERMITTENT INCIDENT
Refer to Trouble Diagnosis For Intermittent Incident Trouble Diagnosis For Intermittent Incident.
-INSPECTION END
Component Inspection
ASCD BRAKE SWITCH
1.Turn ignition switch OFF.
2.Disconnect ASCD brake switch harness connector.
3.Check continuity between ASCD brake switch terminals 1 and 2
under the following conditions.
If NG, adjust ASCD brake switch installation, and perform step 3 again.
ASCD CLUTCH SWITCH
1.Turn ignition switch OFF.
2.Disconnect ASCD clutch switch harness connector.
3.Check continuity between ASCD clutch switch terminals 1 and 2
under the following conditions.
If NG, adjust ASCD clutch switch installation, and perform step 3 again.
STOP LAMP SWITCH
1.Turn ignition switch OFF.
2.Disconnect stop lamp switch harness connector.
3.Check continuity between stop lamp switch terminals 1 and 2 under the following conditions.
If NG, adjust stop lamp switch installation, and perform step 3 again.