engine SUBARU LEGACY 1997 Service Repair Manual

B4M0435A
2. CHECK HARNESS BETWEEN ABS/TCS CONTROL
MODULE AND ENGINE CONTROL MODULE.
1) Turn ignition switch OFF.
2) Disconnect engine control module.
3) Disconnect ABS/TCS control module.
4) Measure voltage between ABS/TCS control module
connector and body.
Connector & terminal / Specified voltage:
(P6) No. 12—body/0V(AET communication
cable)
(P6) No. 5—body/0V(AEB communication
cable)
(P6) No. 14—body/0V(AEC communication
cable)
5) Turn ignition switch ON.
6) Measure voltage between ABS/TCS control module
connector and body.
Connector & terminal / Specified voltage:
(P6) No. 12—body/0V(AET communication
cable)
(P6) No. 5—body/0V(AEB communication
cable)
(P6) No. 14—body/0V(AEC communication
cable)
B4M0434A
3. CHECK ABS/TCS CONTROL MODULE INTERNAL
CIRCUITS.
1) Turn ignition switch OFF.
2) Disconnect engine control module.
3) Connect ABS/TCS control module.
4) Measure voltage between ABS/TCS control module
connector and body.
Connector & terminal / Specified voltage:
(P6) No. 12—body/2Vorless (AET communica-
tion cable)
(P6) No. 5—body/2Vorless (AEB communica-
tion cable)
(P6) No. 14—body/2Vorless (AEC communi-
cation cable)
5) Turn ignition switch ON.
6) Measure voltage between ABS/TCS control module
connector and body.
Connector & terminal / Specified voltage:
(P6) No. 12—body/2Vorless (AET communica-
tion cable)
(P6) No. 5—body/2Vorless (AEB communica-
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8. Diagnostics Chart with Trouble Code

tion cable)
(P6) No. 14—body/2Vorless (AEC communi-
cation cable)
B4M0740A
4. CHECK OUTPUT VOLTAGE OF ENGINE CONTROL
MODULE.
1) Turn ignition switch OFF.
2) Connect engine control module.
3) Connect ABS/TCS control module.
4) Turn ignition switch ON.
5) Measure voltage between engine control module con-
nector and body.
Connector & terminal / Specified voltage:
(B84) No. 74—body / 4—5.4 V (AET communi-
cation cable)
(B84) No. 73—body / 4—5.4 V (AEB communi-
cation cable)
(B84) No. 47—body / 4—5.4 V (AEC communi-
cation cable)
B4M0438A
5. CHECK BODY SHORT OF HARNESS.
1) Turn ignition switch OFF.
2) Disconnect engine control module.
3) Disconnect ABS/TCS control module.
4) Measure resistance between ABS/TCS control module
connector and body.
Connector & terminal / Specified resistance:
(P6) No. 12—body/1MΩor more (AET commu-
nication cable)
(P6) No. 5—body/1MΩor more (AEB communi-
cation cable)
(P6) No. 14—body/1MΩor more (AEC commu-
nication cable)
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8. Diagnostics Chart with Trouble Code

B4M0728A
6. CHECK OPEN CIRCUIT OF HARNESS.
1) Turn ignition switch OFF.
2) Disconnect engine control module.
3) Disconnect ABS/TCS control module.
4) Measure resistance between ABS/TCS control module
connector and engine control module connector.
(P6) No. 12—(B84) No. 74 / 1Ωor less (AET commu-
nication
cable)
(P6) No. 5—(B84) No. 73 / 1Ωor less (AEB commu-
nication cable)
(P6) No. 14—(B84) No. 47 / 1Ωor less (AEC com-
munication
cable)
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8. Diagnostics Chart with Trouble Code

L: TROUBLE CODE 57
—FAULTY FLUID LEVEL SENSOR—
DIAGNOSIS:

Faulty fluid level sensor circuit

Faulty harness/connector

Faulty ABS/TCS control module

Faulty generator
TROUBLE SYMPTOM:

ABS does not operate.

TCS does not operate.
1. Check engine trouble code.
Ye sNO
5. Check generator function.
OK
Not OK
Repair generator.
6. Check input voltage of ABS/TCS control
module.
OK
Not OK
Repair harness/connector.
Replace ABS/TCS control module.
2. Check input voltage of ABS/TCS control module.
OK
Not OK
Repair harness/connector.
3. Check ground short of harness.
OK
Not OK
Repair harness.
4. Check ground circuit of ABS/TCS control module.
OK
Not OK
Repair harness/connector.
Replace ABS/TCS control module.






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8. Diagnostics Chart with Trouble Code

B4M0743
1. CHECK ENGINE TROUBLE CODE.
1) Read out engine trouble code.
2) Is trouble code 39 in memory?
B4M0395A
2. CHECK INPUT VOLTAGE OF ABS/TCS CONTROL
MODULE.
1) Turn ignition switch OFF.
2) Disconnect ABS/TCS control module connectors.
3) Turn ignition switch ON, while engine is idling.
4) Measure voltage between ABS/TCS control module
connector and body.
Connector & terminal / Specified voltage:
(P5) No. 1—body / 14.5±0.3 V
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8. Diagnostics Chart with Trouble Code

B4M0733A
3. CHECK GROUND SHORT OF HARNESS.
1) Turn ignition switch OFF.
2) Remove No. 18 fuse from fuse and joint box.
3) Disconnect ABS/TCS control module connectors.
4) Measure resistance between ABS/TCS control module
connector and body.
Connector & terminal / Specified resistance:
(P5) No. 1—body/1MΩor more
B4M0405A
4. CHECK GROUND CIRCUIT OF ABS/TCS CONTROL
MODULE.
1) Turn ignition switch OFF.
2) Disconnect connector from ABS/TCS control module.
3) Measure resistance between ABS/TCS control module
connector and body.
Connector & terminal / Specified resistance:
(P4) No. 6—body / 1Ωor less
(P5) No. 5—body / 1Ωor less
(P7) No. 15—body / 1Ωor less
5. CHECK GENERATOR FUNCTION.
1) When the ignition key is at OFF, check the charge warn-
ing light is off.
2) Turn the key ON and ensure the light comes on.
3) Keep the engine running at idle and ensure the light
goes off.
B4M0473A
B4M0395A
6. CHECK INPUT VOLTAGE OF ABS/TCS CONTROL
MODULE.
1) Turn ignition switch OFF.
2) Disconnect ABS/TCS control module connectors.
3) Turn ignition switch ON.
4) Measure voltage between ABS/TCS control module
connector and body.
Connector & terminal / Specified voltage:
(P7) No. 20—body/2Vorless (Engine OFF)
(P7) No. 20—body / 10—14 V (Engine idling)
(P5) No. 1—body / 10—13 V (Engine OFF)
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8. Diagnostics Chart with Trouble Code

2. FA MODE (ON/OFF DATA ARE DISPLAYED.)
If the system is in normal condition with the engine run at
idle speed (when the brake pedal is off), the LED of EC
(AEC signal) of FA2 will come on, the LED of EM (EAM
signal) blink and all other LED’s go out.
Function code
Measuring
itemsContents to be monitored Scroll Ref. to 4-4b
Code Abbreviation
FA 0OF OFF.SW LED 1 comes on with the OFF switch on.
Possible [T9H0] B1Stop light
switchLED 2 comes on with the switch on (with the brake
pedal down).
VRValve relay
signalLED 3 comes on with the valve relay off.
VMValve relay
monitorLED 4 comes on with the valve relay off.
MRMotor relay
signalLED 5 comes on with the motor on.
MS Motor sensor LED 6 comes on with the motor on.
FSFluid level
sensorLED 7 comes on with the sensor on (the fluid level
is lowered).
FA 1FI FR.IN valveLED 1 comes on when the FR.IN valve is operat-
ing.
Possible [T9I0] RO FR.OUT valveLED 2 comes on when the FR.OUT valve is operat-
ing.
FL FL.IN valve LED 3 comes on when the FL.IN valve is operating.
LO FL.OUT valveLED 4 comes on when the FL.OUT valve is operat-
ing.
T1 TCS1 valve LED 5 comes on when the TCS1 valve is operating.
RI RR.IN valveLED 6 comes on when the RR.IN valve is operat-
ing.
RO RR.OUT valveLED 7 comes on when the RR.OUT valve is operat-
ing.
RI RL.IN valve LED 8 comes on when the RL.IN valve is operating.
LO RL.OUT valveLED 9 comes on when the RL.OUT valve is operat-
ing.
T2 TCS2 valveLED 10 comes on when the TCS2 valve is operat-
ing.
FA 2AWABS warning
lightLED 1 comes on when the warning light is on.
Possible [T9J0] TWTCS warning
lightLED 2 comes on when the warning light is on.
TOTCS OFF
indicator lightLED 3 comes on when the indicator light is on.
TITCS operation
indicator lightLED 4 comes on when the indicator light is on.
EC AEC signalWith the engine run at idle speed, LED 6 (AEC)
comes on and LED 7 (AEB) goes out (They go on
and off depending on the behavior of a vehicle.) EB AEB signal
ET AET signal LED 8 comes on with the TCS control on.
EM EAM signalLED 9 comes on or blinks when the engine control
is enabled.
AT AAT signal LED 10 comes on when ABS control is on.
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9. Select Monitor Function Mode

LED No. Signal name Display
1Front right inlet solenoid
valveFI
2Front right outlet solenoid
valveRO
3Front left inlet solenoid
valveFI
4Front left outlet solenoid
valveLO
5Traction control solenoid
valve 1T1
6Rear right inlet solenoid
valveRI
7Rear right outlet solenoid
valveRO
8Rear left inlet solenoid
valveRI
9Rear left outlet solenoid
valveLO
10Traction control solenoid
valve 2T2
FI RO FI LO T1
RI RO RI LO T2
1
2345
678910
I: MODE FA1
—ON↔OFF SIGNAL—
Requirement for LED“ON”
LED No. 1 Front right inlet solenoid valve is in function.
LED No. 2 Front right outlet solenoid valve is in function.
LED No. 3 Front left inlet solenoid valve is in function.
LED No. 4 Front left outlet solenoid valve is in function.
LED No. 5 Traction control solenoid valve 1 is in func-
tion.
LED No. 6 Rear right inlet solenoid valve is in function.
LED No. 7 Rear right outlet solenoid valve is in function.
LED No. 8 Rear left inlet solenoid valve is in function.
LED No. 9 Rear left outlet solenoid valve is in function.
LED No. 10 Traction control solenoid valve 2 is in func-
tion.
LED No. Signal name Display
1 ABS warning light AW
2 TCS warning light TW
3 TCS OFF indicator light TO
4TCS operating indicator
lightTI
5——
6 AEC signal EC
7 AEB signal EB
8 AET signal ET
9 EAM signal EM
10 AAT signal AT
AW TW TO TI—
EC EB ET EM AT
1
2345
678910
J: MODE FA2
—ON↔OFF SIGNAL—
Requirement for LED“ON”
LED No. 1 ABS warning light is on.
LED No. 2 TCS warning light is on.
LED No. 3 TCS OFF indicator light is on.
LED No. 4 TCS operating indicator light is on.
LED No. 6 Engine is running at idle. (LED comes on or
goes off depending on vehicle movement.)
LED No. 7 Engine is running at idle. (LED comes on or
goes off depending on vehicle movement.)
LED No. 8 TCS control operates.
LED No. 9 Engine control is permitted.
LED No. 10 ABS control operates.
NOTE:
If the system is normal when idling the engine without
depressing brake pedal, LED No. 6 comes on, LED No. 9
blinks and all other LED’s are off.
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9. Select Monitor Function Mode

B4M0521
V: TROUBLE CODE 43
EGI LINE
—Faulty engine control module communication
cables—
DIAGNOSIS:

AET communication cable is broken or short circuited.

AEB communication cable is broken or short circuited.

AEC communication cable is broken or short circuited.

Faulty ABS/TCS control module

Faulty engine control module
TROUBLE SYMPTOM:

TCS does not operate.
1. Check communication cables.

OK

Terminal voltage
remains at 4—5.4 V.
Replace ABS/TCS control module.

Terminal voltage
remains at 10—14 V.
Go to step 2.

Terminal voltage
remains at2Vorless.
Go to step 4.
Replace ABS/TCS control module.
2. Check harness between ABS/TCS control
module and ECM.

OK
Not OK
Repair harness.
3. Check ABS/TCS control module internal
circuits.

OK
Not OK
Replace ABS/TCS control module.
Replace engine control module.
4. Check output voltage of ECM.

Not OK
OK
6. Check open circuit of harness.
OK Not OK
Replace ABS/TCS
control module.
5. Check body short of harness.

OK
Not OK
Repair harness/connector.
Replace engine control module.






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10. Diagnostic Chart with Select Monitor

11. General Diagnostics Table
: Primary expected causes: Secondary expected causes
Trouble conditions
SymptomsHydraulic
unit
Speed sensor
P valve
Master cylinder
Calipers and piston
Pad
Rotor
Hand brake
Piping
Mixture of air
Brake booster and check valve
Axle and wheel
Alignment
Play of pedal
Rough road surface
Semicylindrical road surface
Loose or worn suspension
Tire
Wrong connection and wiring
Stroke sensor Solenoid valve
Motor
Mount bush ABS function
Directional stability cannot be
obtained when braking.Vehicle turns to right or left. 
Vehicle spins.
Out-of-order brakesLong braking distance
 
Brakes lock.  
Brakes drag.
Long pedal stroke  
Abnormal vehicle pitching 
Unstable braking force. One-
side brake refuses to work. 
TCS function
When accelerating abruptly,
directional stability cannot be
obtained when traveling on a
slippery road surface.Vehicle moves unsteadily.
Handle refuses to work.
Handle loses control. 
Bad acceleration, engine stall-
ing (In addition to the causes
listed here, check the ECM
specifications.)Engine stalls. Engine speed
fails to increase.
Engine speed increases sud-
denly.
Vibration occurs and abnormal
noise is produced.

When applying brakes abruptly.

When accelerating abruptly.

When driving on a slippery
road surface.Brake pedal heavily vibrates
when applying brakes.
   
Loud hydraulic unit operating
noise
Noise is produced from front
of vehicle.
Noise is produced from rear of
vehicle.
NOTE:
This list includes no engine failure and transmission failure.
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11. General Diagnostics Table