Mitsubishi Galant 9G. Manual — part 1617
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-52
STEP 5. Measure the resistance at ABS-ECU connector
A-02.
(1) Disconnect the connector A-02, and connect special tool
ABS Check Harness (MB991970) to the wiring
harness-side connector.
NOTE: Do not connect special tool ABS Check Harness
(MB991970) to the ABS-ECU.
(2) Measure the resistance between terminal 18 and ground. It
should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 7.
NO : Go to Step 6.
AC306403
19
2
18
1
8
9
7
6
5
4
3
10
11
25
15
16
17
27
28
26
12
13
14
23
24
22 21 20
A-02(GR)
CONNECTOR: A-02
HYDRAULIC UNIT
(WITH BUILT-IN ABS-ECU)
AH
ABS-ECU
MB991970
CHECK CONNECTOR
A-02 HARNESS
CONNECTOR
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-53
STEP 6. Check ABS-ECU connector A-02 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ABS-ECU connector A-02 damaged?
YES : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
NO : An open circuit may be present in the ground circuit.
Repair the wiring harness between ABS-ECU
connector A-02 terminal 18 and the body ground.
Then go to Step 8.
STEP 7. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the DTC.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Turn the ignition switch to the "ON" position.
(5) Check if the DTC is set.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC C1266, C1273 or C1274 set?
YES : Replace the hydraulic unit (integrated with
ABS-ECU). Then go to Step 8.
NO : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunction
AC306406
19
2
18
1
8
9
7
6
5
4
3
10
11
25
15
16
17
27
28
26
12
13
14
23
24
22 21 20
A-02 HARNESS CONNECTOR
(HARNESS SIDE)
AB
A-02 (GR)
CONNECTOR: A-02
HYDRAULIC UNIT
(WITH BUILT-IN ABS-ECU)
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-54
STEP 8. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the DTC.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Turn the ignition switch to the "ON" position.
(5) Check if the DTC is set.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC C1266, C1273 or C1274 set?
YES : Go to Step 1.
NO : The procedure is complete.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-55
DTC C1278/C1279 Valve Relay System
CAUTION
If there is any problem in the CAN bus lines, an
incorrect diagnostic trouble code may be set.
Prior to this diagnosis, diagnose the CAN bus
lines.
.
CIRCUIT OPERATION
• The ABS-ECU contains the power supply circuit
(terminal 1) for the solenoid valve. The solenoid
valve is energized by the valve relay, which is
integrated in the ABS-ECU.
• The valve relay, which is integrated in the
ABS-ECU, is always energizing the solenoid
valve unless the initial check is in progress when
the ignition switch is turned on.
.
ABS DTC SET CONDITIONS
These diagnostic trouble codes will be set under the
cases below.
ABS SOLENOID VALVE
HYDRAULIC UNIT
MOTOR
FUSIBLE
LINK
MOTOR
POWER
SUPPLY
SOLENOID
VALVE POWER
SUPPLY
ABS-ECU
3
AC308173
AB
Solenoid Valve and Motor Power Supply Circuit
AC304742
A-02 (GR)
CONNECTOR: A-02
HYDRAULIC UNIT
(WITH BUILT-IN ABS-ECU)
AC
AC305015AE
FUSIBLE LINK
No.3
RELAY BOX IN ENGINE COMPARTMENT
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