This is the power source for the ECU, hence for the CPU, and ABS actuator. DTC No. DTC Detecting Condition. Trouble Area. C1241 / 41. Detection of any of ...
CIRCUIT DESCRIPTION This is the power source for the ECU, hence for the CPU, and ABS actuator. DTC No.
DTC Detecting Condition
C1241 / 41
Detection of any of conditions from 1. through 3. 1. With vehicle speed at 3 km/h or more, IG1 or +BS terminal voltage is 8.5 V or below for 10 sec. or longer. 2. With IG1 terminal voltage at 8.5 V or below, ABS solenoid relay open, ABS motor relay open, solenoid fault detecting condition are established. 3. +BS terminal voltage is 19 V or above for 1 sec. or longer
Trouble Area
Battery Charging system Power source circuit
WIRING DIAGRAM ABS Actuator with ECU
Instrument Panel J/B Ignition Switch 2 B-Y
1 AM1
4
ECU-IG
1O
IG1
8 W-L
1O
4 FL Block ALT
1
2 AM1 2
1
3 B-L
1B
3 A4 IG
1 1C
B (*1) B-G (*2)
ABS 2 A4 +BS 24 A4 +BM
B
5
B
BR W-B
Battery
1 A4 GND1 23 A4
GND2
EC *1: Puerto Rico *2: Except Puerto Rico F09224
2002 ECHO (RM884U)
Author:
Date:
392
DI-223 DIAGNOSTICS
-
ANTI-LOCK BRAKE SYSTEM
INSPECTION PROCEDURE 1
Check ECU-IG fuse. PREPARATION: Remove ECU-IG fuse from Instrument Panel J/B. CHECK: Check continuity of ECU-IG fuse. OK: Continuity
Instrument Panel J/B
ECU-IG F08570
NG
Check for short circuit in all the harness and components connected to ECU-IG fuse (See attached wiring diagram).
NG
Check and repair the charging system (See page IN-29 ).
OK
2
Check battery positive voltage.
OK: Voltage: 10 - 14 V
OK
3
Check voltage of the ECU IG power source.
In case of using the TOYOTA hand-held tester: PREPARATION: (a) Connect the TOYOTA hand-held tester to the DLC3. (b) Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON. (c) Select the DATALIST mode on the TOYOTA hand-held tester. CHECK: Check the voltage condition output from the ECU displayed on the TOYOTA hand-held tester. OK: ”Normal” is displayed. 2002 ECHO (RM884U)
Author:
Date:
393
DI-224 DIAGNOSTICS
-
ANTI-LOCK BRAKE SYSTEM
In case of not using the TOYOTA hand-held tester: PREPARATION: ON Disconnect ABS ECU connector. 3 CHECK: 1 (a) Turn the ignition switch ON. (+) (b) Measure voltage between terminals 3 and 1, 23 of ABS ECU harness side connector. OK: (-) Voltage: 10 - 14 V 23 F08558
OK
Check or replace ABS actuator assembly.
NG
4
Check continuity between terminals GND (1, 23) of ABS ECU connector and body ground. CHECK: Measure resistance between terminals 1 and 23 of ABS ECU harness side connector and body ground. OK: Resistance: 1 Ω or less
LOCK 1 (+)
(-) 23 F08559
NG
Repair or replace harness or connector.
OK
Check for open circuit in harness and connector between ABS ECU and ECU-IG fuse (See page IN-29 ).
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