Nissan Maxima. Instruction — part 1127
STC-14
< DTC/CIRCUIT DIAGNOSIS >
VEHICLE SPEED SIGNAL CIRCUIT
2. Turn ignition switch ON.
3. Check voltage between combination meter connector M24 ter-
minal 30 and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connectors.
4.
CHECK VEHICLE SPEED SIGNAL (COMBINATION METER SIDE)
1. Turn the ignition switch OFF.
2. Connect combination meter connector.
3. Check combination meter input/output standard values. Refer to
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace combination meter. Refer to
MWI-122, "Removal and Installation"
5.
CHECK VEHICLE SPEED SIGNAL (POWER STEERING CONTROL UNIT SIDE)
1. Turn the ignition switch OFF.
2. Connect power steering control unit connector.
3. Start the engine.
4. Check signal between power steering control unit connector
M59 terminal 8 and ground with oscilloscope.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace power steering control unit. Refer to
STC-22, "Removal and Installation"
6.
CHECK TERMINALS AND HARNESS CONNECTORS
1. Check power steering control unit pin terminals for damage or loose connection with harness connector.
2. Check combination meter pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES
>> Inspection End
NO
>> Repair or replace damaged parts.
Combination meter
Ground
Voltage (Approx.)
Connector
Terminal
M24
30
—
0V
AWGIA0098ZZ
Power steering control unit
Value (Approx.)
Connector
Terminal
Condition
M59
8 - Ground
Vehicle speed:
40 km/h (25
MPH)
CAUTION:
Check air
pressure of
tire under
standard con-
dition.
AWGIA0121ZZ
ELF1080D
POWER STEERING CONTROL UNIT
STC-15
< ECU DIAGNOSIS INFORMATION >
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STC
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ECU DIAGNOSIS INFORMATION
POWER STEERING CONTROL UNIT
Reference Value
INFOID:0000000009466561
TERMINAL LAYOUT
PHYSICAL VALUES
CAUTION:
JSGIA0023ZZ
Terminal No.
Wire
color
Description
Condition
Value (Approx.)
+
-
Signal name
Input/
Output
1
Ground
R/Y
Power steering so-
lenoid valve voltage
Output
Vehicle speed: 0 km/h (0 MPH)
(Engine is running)
4.4 - 6.6 V
Vehicle speed: 100 km/h (62 MPH)
2.5 - 3.7 V
3
Ground
G
Ignition power sup-
ply
Input
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
5
Ground
LG/W
Power steering so-
lenoid valve ground
—
Always
0 V
6
Ground
B
Ground
—
Always
0 V
8
Ground
L/B
Vehicle speed sig-
nal
Input
Vehicle speed: 40 km/h (25 MPH)
CAUTION:
Check air pressure of tire under
standard condition.
10
Ground
V/W
Engine speed sig-
nal
Input
Engine speed: At idle
(Warm-up condition)
Engine speed: Approx. 2,000 RPM
(Warm-up condition)
ELF1080D
JSGIA0143ZZ
PBIA3655J
STC-16
< ECU DIAGNOSIS INFORMATION >
POWER STEERING CONTROL UNIT
When using circuit tester or oscilloscope to measure voltage for inspection, be sure not to extend forcibly any connector ter-
minals.
Fail Safe
INFOID:0000000009466562
EPS system
• EPS system enters the fail-safe mode (that allows the steering
force to be controlled without impairing the drive ability) if any of
the input/output signals to/from EPS system (power steering con-
trol unit) deviate from the standard.
NOTE:
The system enters the fail-safe mode if the engine speed remains
at 1,500 RPM or more for over 10 seconds while the vehicle is
stopped. This is normal.
• The fail-safe function is cancelled when a vehicle speed signal of 2
km/h (1.2 MPH) or more is inputted or the key switch is turned
OFF
→ ON. EPS system restores the normal operation at that time.
ABGIA0091GB
Function
Warn-
ing lamp
DTC No.
Detection point (malfunction part)
Malfunction part and cause
Fail-safe
function
—
—
Vehicle speed signal
• Engine speed is 1,500 RPM or more and there is no vehicle
speed signal input for over 10 seconds during vehicle travel.
• Vehicle speed signal has abruptly dropped from 30 km/h (19
MPH) or more to 2 km/h (1.2 MPH) or less within 1.4 sec-
onds.
ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM
STC-17
< WIRING DIAGRAM >
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WIRING DIAGRAM
ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM
Wiring Diagram
INFOID:0000000009466563
ABGWA0002GB
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