Mazda 2: Electric Power Steering (EPS)
ELECTRIC POWER STEERING (EPS) SYSTEM WIRING DIAGRAM

ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS
On-Board Diagnostic (OBD) Test Description
- The OBD test inspects the integrity and function of the EPS and outputs
the results when
requested by the specific tests.
- On-board diagnostic test also:
- Provides a quick inspection of the EPS usually performed at the
start of
each diagnostic procedure.
- Provides verification after repairs to ensure that no other faults
occurred
during service.
- The OBD test is divided into 2 tests:
- Read/clear diagnostic results, PID/Data monitor and record.
Read/clear diagnostic results
- This function allows reading or clearing of DTCs in the EPS CM memory.
PID/Data monitor and record
- This function allows access of certain data values, input signals,
calculated values, and
system status information.
Reading DTCs Procedure
1. Connect the M-MDS (IDS) to the DLC-2.
2. After the vehicle is identified, select the following items from the
initialization screen of the
IDS.
- Select "Self Test".
- Select "Modules".
- Select "EPS".
3. Verify the DTC according to the directions on the screen.
- If any DTCs are displayed, perform troubleshooting according to the
corresponding DTC inspection.
4. After completion of repairs, clear all DTCs stored in the EPS CM. (See
Clearing DTCs
Procedures).
Clearing DTCs Procedures
1. Connect the M-MDS (IDS) to the DLC-2.
2. After the vehicle is identified, select the following items from the
initialization screen of the
IDS.
- Select "Self Test".
- Select "Modules".
- Select "EPS".
3. Verify the DTC according to the directions on the screen.
4. Press the clear button on the DTC screen to clear the DTC.
5. Switch the ignition to off.
6. Switch the ignition to ON and wait for 5 s or more.
7. Perform DTC inspection. (See Reading DTCs Procedure).
8. Verify that no DTCs are displayed.
PID/Data Monitor and Record Procedure
1. Connect the M-MDS (IDS) to the DLC-2.
2. After the vehicle is identified, select the following items from the
initialization screen of the
IDS.
- Select "DataLogger".
- Select "Modules".
- Select "EPS".
3. Select the applicable PID from the PID table.
4. Verify the PID data according to the directions on the screen.
NOTE:
- The PID data screen function is used for monitoring the calculated value
of input/output
signals in the module. Therefore, if the monitored value of the output parts
is not within
the specification, it is necessary to inspect the monitored value of input
parts
corresponding to the applicable output part control. In addition, because
the system does
not display an output part malfunction as an abnormality in the monitored
value, it is
necessary to inspect the output parts individually.
DTC Table



PID/DATA Monitor Table



DTC C1B00:2F/C1B00:61/C1B00:62

Diagnostic Procedure

DTC C1B00:54, C1B00:95

Diagnostic Procedure


DTC C200B:2F/C200B:61/C200C:2F

Diagnostic Procedure

DTC C200D:49/U2011:49/U2011:61

Diagnostic Procedure

DTC U0001:88

Diagnostic Procedure
DTC U0100:00

Diagnostic Procedure
DTC U0300:00

Diagnostic Procedure

DTC U0401:00

Diagnostic Procedure

DTC U2100:00

Diagnostic Procedure

DTC U3000:05/U3000:41/U3000:43/U3000:46/U3000:49/U3000:61/U3000:96

Diagnostic Procedure


DTC U3003:16/U3003:17

System wiring diagram

Diagnostic Procedure


DTC U3004:49

Diagnostic Procedure

ELECTRIC POWER STEERING (EPS) SYSTEM WIRING DIAGRAM

FOREWORD
- Before performing the steps in Symptom Troubleshooting, perform the
On-board
Diagnostic Inspection. To inspect the DTC, follow the DTC Inspection steps.
(See
ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS).
PRECAUTION
Intermittent Concern Troubleshooting
Vibration method
- If a malfunction occurs or becomes worse while driving on a rough road
or when the
engine is vibrating, perform the following steps.
NOTE:
- There are several reasons why vehicle or engine vibration could cause an
electrical
malfunction. Inspect the following:
- Connectors not fully seated.
- Wiring harnesses not having full play.
- Wires laying across brackets or moving parts.
- Wires routed too close to hot parts.
- An improperly routed, improperly clamped, or loose wiring harness can
cause wiring to
become pinched between parts.
- The connector joints, points of vibration, and places where wiring
harness pass through
the firewall, body panels and other panels are the major areas to be
inspected.
Inspection method for switch and/or sensor connectors or wires
1. Connect the M-MDS to the DLC-2.
2. Switch the ignition to ON (engine off).
NOTE:
- If the engine starts and runs, perform the following steps at idle.
3. Access PIDs for the switch you are inspecting.
4. Turn the switch on manually.
5. Slightly shake each connector or wiring harness vertically and horizontally
while
monitoring the PID.

- If the PID value is unstable, inspect for poor connection.
Inspection method for sensors
1. Connect the M-MDS to the DLC-2.
2. Switch the ignition to ON (engine off).
NOTE:
- If the engine starts and runs, perform the following steps at idle.
3. Access PIDs for the switch you are inspecting.
4. Vibrate the sensor slightly with your finger.
- If the PID value is unstable or a malfunction occurs, inspect for poor
connection and/or poorly mounted sensor.
Connector terminal inspection method
1. Inspect the connection of each female terminal.
2. Insert the male terminal to the female terminal and inspect the female
terminal for
looseness.

SYMPTOM TROUBLESHOOTING
- Verify the symptom, and perform troubleshooting according to the
appropriate number.

NO.1 ELECTRIC POWER STEERING (EPS) WARNING LIGHT DOES NOT ILLUMINATE
WITH
IGNITION SWITCH AT ON

Diagnostic procedure

NO.2 ELECTRIC POWER STEERING (EPS) WARNING LIGHT DOES NOT GO OUT EVEN
THOUGH
ENGINE HAS STARTED

Diagnostic procedure


NO.3 ELECTRIC POWER STEERING (EPS) WARNING LIGHT FLASHING

Diagnostic procedure

NO.4 POWER ASSIST DIFFERS BETWEEN RIGHT AND LEFT TURNS

Diagnostic procedure


READ NEXT:
WARNING:
Always inspect the steering component carefully for any shock or impact
which may
have occurred during a collision or servicing operation. If a damaged part
or a part
suspected of bei
Steering wheel and column
(See STEERING WHEEL AND COLUMN INSPECTION.)
(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
Steering shaft
(See STEERING SHAFT INSPECTION.)
EPS CM
STEERING WHEEL AND COLUMN INSPECTION
Play inspection
1. With the wheels in the straight-ahead position, start the engine.
2. Turn the steering wheel to the left and right gently, then verify that the
SEE MORE:
DSC LOCATION INDEX
DSC HU/CM
(See DSC SYSTEM WIRING DIAGRAM.)
(See DSC SYSTEM INSPECTION.)
(See DSC HU/CM REMOVAL/INSTALLATION.)
(See DSC HU/CM INSPECTION.)
Brake fluid pressure sensor (Built into DSC HU/CM)
(See BRAKE FLUID PRESSURE SENSOR INSPECTION.)
(See DSC SENSOR INITIALIZ
LUBRICATION SYSTEM LOCATION INDEX
Dipstick
(See ENGINE OIL LEVEL INSPECTION)
(See ENGINE OIL REPLACEMENT)
Oil pressure switch
(See OIL PRESSURE INSPECTION)
Oil filter
(See OIL FILTER REPLACEMENT)
Oil strainer
(See OIL PAN REMOVAL/INSTALLATION)
Oil pan
(See OIL PAN
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