Mitsubishi Colt Ralliart. Manual — part 437

TROUBLESHOOTING

POWER STEERING

37-15

STEP 9. Check the 3-V power supply for open
circuit.

AC314189AD

Connector: B-37-1

Harness side

Measure the voltage between the 3-V power supply
(connector B-37-1 terminal 18) and body earth with-
out disconnecting the connector (by backprobing).

• Ignition switch: ON (start the engine)

•

AC400130

Harness side
connector B-37-1
(Rear view)

AB

Measure the voltage between the 3-V power supply

(connector B-37-1 terminal 18) and the body
earth.

OK: 2.88

− 3.12 V

Q: Is the check result normal?

YES :

Go to Step 10.

NO :

Replace the electric power steering-ECU
(Refer to

P.37-102

).

STEP 10. Check the 8-V power supply for open
circuit.

AC314189AD

Connector: B-37-1

Harness side

Measure the 8-V power supply voltage between
connector B-37-1 terminal 14 and body earth without
disconnecting the connector (by backprobing). Dis-
connect electric power steering-ECU, and measure
the internal resistance in the ECU.

• Ignition switch: ON

•

AC400131

Harness side
connector B-37-1
(Rear view)

AB

Measure the voltage between the 8-V power supply

(connector B-37-1 terminal 14) and the body
earth.

OK: 7.5

− 8.5 V

Q: Is the check result normal?

YES :

Go to Step 11.

NO :

Replace the electric power steering-ECU
(Refer to

P.37-102

).

Main

Index

Group

TOC

TROUBLESHOOTING

POWER STEERING

37-16

STEP 11. Check whether the diagnosis code is
reset

AC206895

AC

Diagnosis

connector

MB991827

MB991824

MB991910

CAUTION

Before connecting or disconnecting the
M.U.T.-III, turn the ignition switch to the "LOCK"
(OFF) position.
Check again if the diagnosis code is set.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)

position.

(4) Turn the ignition switch to the "ON" position.
(5) Start the engine, and turn the steering wheel.
(6) Check if the diagnosis code is set.
(7) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is diagnosis code C1511 or C1512 set?

YES :

Replace the steering gear box and linkage

assembly (Refer to

P.37-96

).

NO :

The malfunction is intermittent. Refer to
GROUP 00, How to Use
Troubleshooting/Inspection Service Points

−

How to Cope with Intermittent Malfunction

P.00-13

.

STEP 12. M.U.T.-III diagnosis code

AC206895

AC

Diagnosis

connector

MB991827

MB991824

MB991910

CAUTION

Before connecting or disconnecting the
M.U.T.-III, turn the ignition switch to the "LOCK"
(OFF) position.
Check again if the diagnosis code is set.
(1) Turn the ignition switch to the "ON" position.
(2) After starting the engine, check whether

diagnosis code C1514 is set.

(3) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is the status of diagnosis code C1514 stored as

"Active"?
YES :

Go to Step 13.

NO :

The malfunction is intermittent. Refer to
GROUP 00, How to Use
Troubleshooting/Inspection Service Points

−

How to Cope with Intermittent Malfunction

P.00-13

.

Main

Index

Group

TOC

TROUBLESHOOTING

POWER STEERING

37-17

STEP 13. Check the harness wires between
electric power steering-ECU connector B-37-1
(terminal 13) and torque sensor.

AC314189AD

Connector: B-37-1

Harness side

Q: Is any wire between electric power steering-ECU

connector B-37-1 (terminal 13) and torque sensor
damaged?
YES :

Repair it.

NO :

Go to Step 14.

STEP 14. Check the earth circuit to the electric
power steering-ECU for open circuit.

AC314189AH

Connector: B-37-1, B-38

B-37-1

B-38

Harness side

B-37-1

B-38

Disconnect electric power steering-ECU connectors
B-38 and B-37-1, and measure the internal resist-
ance in the ECU.

•

AC400134

Harness side
connector B-37-1
(Rear view)

AB

Harness side
connector B-38
(Rear view)

Measure the resistance between connector B-38 ter-

minal 21 and connector B-37-1 terminal 13.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES :

Go to Step 15.

NO :

Replace the electric power steering-ECU
(Refer to

P.37-102

).

Main

Index

Group

TOC

TROUBLESHOOTING

POWER STEERING

37-18

STEP 15. Check whether the diagnosis code is
reset

AC206895

AC

Diagnosis

connector

MB991827

MB991824

MB991910

CAUTION

Before connecting or disconnecting the
M.U.T.-III, turn the ignition switch to the "LOCK"
(OFF) position.
Check again if the diagnosis code is set.
(1) Turn the ignition switch to the "ON" position.

(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)

position.

(4) Turn the ignition switch to the "ON" position.
(5) Start the engine, and turn the steering wheel.
(6) Check if the diagnosis code is set.
(7) Turn the ignition switch to the "LOCK" (OFF)

position.

(8) Disconnect M.U.T.-III.

Q: Is diagnosis code set?

YES :

Replace the steering gear and linkage

assembly (Refer to

P.37-96

).

NO :

The malfunction is intermittent. Refer to
GROUP 00, How to Use
Troubleshooting/Inspection Service Points

−

How to Cope with Intermittent Malfunction

P.00-13

.

Main

Index

Group

TOC