Description
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 those two types of input (ON/OFF signal). Refer to See: Cruise Control\Description and Operation\System Diagram for the ASCD function.
DTC Logic
DTC DETECTION LOGIC
NOTE:
If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to See: P0605.
This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.1st trip DTC is erased when ignition switch is turned OFF. And even when malfunction A is detected in two consecutive trips, DTC is not stored in ECM memory.
DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.
Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds.
NOTE:
The procedure for malfunction B is not described. It takes an extremely long time to complete the procedure for malfunction B. By performing the procedure for malfunction A, the condition that causes malfunction B can be detected.
>> GO TO 2. 2.PERFORM DTC CONFIRMATION PROCEDURE With CONSULT-III
Start engine (ESP switch OFF).
Select "DATA MONITOR" mode with CONSULT-III.
Press MAIN switch and check that CRUISE lamp illuminate.
Drive the vehicle for at least 5 consecutive seconds under the following conditions.
CAUTION: Always drive vehicle at a safe speed.
NOTE: This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.
Check 1st trip DTC. With GST
Follow the procedure "With CONSULT-III" above.
Is 1st trip DTC detected?
YES >> Go to Diagnosis Procedure.
NO >> GO TO 3. 3.PERFORM DTC CONFIRMATION PROCEDURE With CONSULT-III
Drive the vehicle for at least 5 consecutive seconds under the following conditions.
CAUTION: Always drive vehicle at a safe speed.
NOTE: This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.
Check 1st trip DTC. With GST
Follow the procedure "With CONSULT-III" above.
Is 1st trip DTC detected?
YES >> Go to Diagnosis Procedure.
NO >> Inspection END
Diagnosis Procedure 1.CHECK OVERALL FUNCTION-I With CONSULT-III
Turn ignition switch ON.
Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT-III.
Check "BRAKE SW1" indication under the following conditions.
Without CONSULT-III
Turn ignition switch ON.
Check the voltage between ECM harness connectors.
Is the Inspection result normal?
YES >> GO TO 2.
NO-1 >> CVT models: GO TO 3.
NO-2 >> M/T models: GO TO 7. 2.CHECK OVERALL FUNCTION-II With CONSULT-III
Check "BRAKE SW2" indication in "DATA MONITOR" mode.
Without CONSULT-III
Check the voltage between ECM harness connectors.
Is the Inspection result normal?
YES >> GO TO 19.
NO >> GO TO 15. 3.CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
Turn ignition switch OFF.
Disconnect ASCD brake switch harness connector.
Turn ignition switch ON.
Check the voltage between ASCD brake switch harness connector and ground.
Is the Inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4. 4.DETECT MALFUNCTIONING PART
Check the following.
Fuse block (J/B) connector E6
10 A fuse (No. 3)
Harness for open or short between ASCD brake switch and fuse >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
Turn ignition switch OFF.
Disconnect ECM harness connector.
Check the continuity between ASCD brake switch harness connector and ECM harness connector.
Also check harness for short to ground and short to power. Is the Inspection result normal?
YES >> GO TO 6.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. 6.CHECK ASCD BRAKE SWITCH
Refer to Component Inspection (ASCD Brake Switch).
Is the Inspection result normal?
YES >> GO TO 19.
NO >> Replace ASCD brake switch. 7.CHECK ASCD BRAKE SWITCH CIRCUIT
Turn ignition switch OFF.
Disconnect ASCD clutch switch harness connector.
Turn ignition switch ON.
Check the voltage between ASCD clutch switch harness connector and ground.
Is the Inspection result normal?
YES >> GO TO 12.
NO >> GO TO 8. 8.CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
Turn ignition switch OFF.
Disconnect ASCD brake switch harness connector.
Turn ignition switch ON.
Check the voltage between ASCD brake switch harness connector and ground.
Is the Inspection result normal?
YES >> GO TO 10.
NO >> GO TO 9. 9.DETECT MALFUNCTIONING PART
Check the following.
Fuse block (J/B) connector E6
10 A fuse (No. 3)
Harness for open or short between ASCD brake switch and fuse >> Repair open circuit, short to ground or short to power in harness or connectors.
10.CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
Turn ignition switch OFF.
Check the continuity between ASCD brake switch harness connector and ASCD clutch switch harness connector.
Is the Inspection result normal?
YES >> GO TO 11.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. 11.CHECK ASCD BRAKE SWITCH
Refer to Component Inspection (ASCD Brake Switch).
Is the Inspection result normal?
YES >> GO TO 19.
NO >> Replace ASCD brake switch. 12.CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
Turn ignition switch OFF.
Disconnect ECM harness connector.
Check the continuity between ASCD clutch switch harness connector and ECM harness connector.
Also check harness for short to ground and short to power. Is the Inspection result normal?
YES >> GO TO 14.
NO >> GO TO 13. 13.DETECT MALFUNCTIONING PART
Check the following.
Junction block connectors E45, E46
Joint connector-E06 E27
Harness for open or short between ASCD clutch switch and ECM >> Repair open circuit, short to ground or short to power in harness or connectors.
14.CHECK ASCD CLUTCH SWITCH
Refer to Component Inspection (ASCD Clutch Switch).
Is the Inspection result normal?
YES >> GO TO 19.
NO >> Replace ASCD clutch switch. 15.CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
Turn ignition switch OFF.
Disconnect stop lamp switch harness connector.
Check the voltage between stop lamp switch harness connector and ground.
Is the Inspection result normal?
YES >> GO TO 17.
NO >> GO TO 16. 16.DETECT MALFUNCTIONING PART
Check the following.
Fuse block (J/B) connector E6
10 A fuse (No. 7)
Harness for open or short between stop lamp switch and battery >> Repair open circuit, short to ground or short to power in harness or connectors.
17.CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
Disconnect ECM harness connector.
Check the continuity between stop lamp switch harness connector and ECM harness connector.
Also check harness for short to ground and short to power. Is the Inspection result normal?
