Mitsubishi Lancer Evolution IX. Manual — part 311
TROUBLESHOOTING
REAR AXLE
27-19
STEP 7. Check the harness between direction
valve (RH) connector F-23 terminal No.2 and
4WD-ECU connector C-25 terminal No.14.
AC310740
1 2
Connector: F-23
F-23 (2-B)
AB
Hydraulic unit
assembly
AC310721
18
16
1415
17
23
21
1920
22
26
2425
3
1 2
4 5
10
8
6 7
9
13
12
11
4WD-ECU
C-25 (26-Y)
Connector: C-25
AB
Check the output line for short-circuited or open cir-
cuit.
Q: Is the check result normal?
YES :
Replace the 4WD-ECU.
NO :
Repair the wiring harness.
Code No.73: Direction valve (LH) system
DIRECTION VALVE (LH) SYSTEM
CIRCUIT
Refer to
.
OPERATION
• After processing information of various sensors
and switches, the 4WD-ECU calculates the
amount of AYC torque movement and direction,
and controls the direction valve (LH).
• The current flows from the 4WD-ECU to activate
the direction valve (LH), which supplies the oil
pressure to the AYC left clutch.
DIAGNOSIS CODE SET CONDITIONS
Diagnosis code No.73 is set when the direction valve
(LH) control circuit is open circuited or
short-circuited.
PROBABLE CAUSES
• Malfunction of the direction valve (LH)
• Damaged harness wires and connectors
• Malfunction of the 4WD-ECU
TROUBLESHOOTING
REAR AXLE
27-20
DIAGNOSIS
STEP 1. M.U.T.-II/III data list
Set M.U.T.-II/III to data reading mode, and check the
data list item.
Item 60: direction valve (LH) (Refer to Data List Table
Q: Is the check result normal?
YES :
This malfunction is intermittent. Refer to
GROUP 00, How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunction
.
NO :
Go to Step 2.
STEP 2. Measure the resistance at direction valve
(LH) connector F-22.
AC310739
1 2
Connector: F-22
F-22 (2-B)
AB
Hydraulic unit
assembly
Disconnect the connector, and measure the resist-
ance between terminal 1 and 2 at the direction valve
(LH) side.
OK: 19
− 21 Ω or less
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace the hydraulic unit.
STEP 3. Measure the resistance at direction valve
(LH) connector F-22.
AC310739
1 2
Connector: F-22
F-22 (2-B)
AB
Hydraulic unit
assembly
Measure the resistance between terminal 1 and
earth at the direction valve (LH) side
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the defective connector.
STEP 4. Connectors check: F-22 direction valve
(LH) connector, F-21 intermediate connector
AC310739
1 2
Connector: F-22
F-22 (2-B)
AB
Hydraulic unit
assembly
7
3
5
1
6
2
8
4
AC310719AB
Connector: F21
F-21 (8-B)
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the defective connector.
TROUBLESHOOTING
REAR AXLE
27-21
STEP 5. Check the harness wires between
direction valve (LH) connector F-22 terminal 1
and intermediate connector F-21 and body earth.
AC310739
1 2
Connector: F-22
F-22 (2-B)
AB
Hydraulic unit
assembly
7
3
5
1
6
2
8
4
AC310719AB
Connector: F21
F-21 (8-B)
Check the earth line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the wiring harness.
TROUBLESHOOTING
REAR AXLE
27-22
STEP 6. Connectors check: C-25 4WD-ECU
connector, C-122, C-134 and F-21 intermediate
connectors, and F-22 direction valve (LH)
connector
AC310721
18
16
1415
17
23
21
1920
22
26
2425
3
1 2
4 5
10
8
6 7
9
13
12
11
4WD-ECU
C-25 (26-Y)
Connector: C-25
AB
AC310724
2
1
3
13
12
14
21
10
5
4
6
16
15
17
7 8 9
19
18
20
11
22
Connector: C-122
<LHD>
AB
C-122
(22-L)
AC310725
2
1
3
13
12
14
21
10
5
4
6
16
15
17
7 8 9
19
18
20
11
22
Connector: C-122
<RHD>
AB
C-122 (22-L)
AC310723
6
2
5
1
7 8
11
4
9 10
3
Connector: C-134
<LHD>
AB
C-134 (11-B)
AC310726
6
2
5
1
7 8
11
4
9 10
3
Connector: C-134
<RHD>
AB
C-134 (11-B)
7
3
5
1
6
2
8
4
AC310719AB
Connector: F21
F-21 (8-B)
AC310739
1 2
Connector: F-22
F-22 (2-B)
AB
Hydraulic unit
assembly
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the defective connector.
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