Nissan Altima L32. Instruction — part 1397
POWER SUPPLY AND GROUND CIRCUIT
STC-7
< COMPONENT DIAGNOSIS >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
Is the inspection result normal?
YES
>> Inspection End
NO
>> Repair or replace damaged parts.
STC-8
< COMPONENT DIAGNOSIS >
POWER STEERING SOLENOID VALVE
POWER STEERING SOLENOID VALVE
Description
INFOID:0000000004205830
• Power steering solenoid valve controls the power steering oil pressure in the gear housing assembly.
Diagnosis Procedure
INFOID:0000000004205831
1.
CHECK POWER STEERING SOLENOID VALVE SIGNAL
1. Start engine.
2. Check voltage between power steering control unit harness con-
nector M59 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 4.
2.
CHECK HARNESS BETWEEN POWER STEERING SOLENOID VALVE AND POWER STEERING CON-
TROL UNIT
1. Turn the ignition switch OFF.
2. Disconnect power steering solenoid valve harness connector.
3. Disconnect power steering control unit harness connector.
4. Check the continuity between power steering solenoid valve
harness connector E14 (A) terminal 1 and 2 and the power
steering control unit harness connector M59 (B) terminal 1 and
5.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace damaged parts.
3.
CHECK POWER STEERING SOLENOID VALVE
1. Check resistance between power steering solenoid valve termi-
nals.
Power steering control unit
Value (Approx.)
Connector
Terminal
Condition
M59
1 - Ground
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
AWGIA0108ZZ
Power steering solenoid valve
Power steering control unit
Continuity
Connector
Terminal
Connector
Terminal
E14 (A)
1
M59 (B)
1
Existed
2
5
Existed
AWGIA0036ZZ
Power steering solenoid valve
Resistance (Approx.)
Terminal
1 - 2
5
Ω
AWGIA0037ZZ
POWER STEERING SOLENOID VALVE
STC-9
< COMPONENT DIAGNOSIS >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
2. Check power steering solenoid valve by listening for its opera-
tion sound while applying battery voltage to power steering sole-
noid valve terminal 1 (positive) and battery ground to terminal 2
(negative).
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace power steering solenoid valve. Refer to
4.
CHECK TERMINALS AND HARNESS CONNECTORS
• Check power steering control unit pin terminals for damage or loose connection with harness connector.
• Check power steering solenoid valve pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES
>> Inspection End
NO
>> Repair or replace damaged parts.
AWGIA0038ZZ
STC-10
< COMPONENT DIAGNOSIS >
ENGINE SPEED SIGNAL CIRCUIT
ENGINE SPEED SIGNAL CIRCUIT
Description
INFOID:0000000004205832
• ECM sends engine speed signal to power steering control unit.
Diagnosis Procedure
INFOID:0000000004205833
1.
PERFORM ECM SELF-DIAGNOSIS
With CONSULT-III
Perform ECM self-diagnosis.
Is any error system detected?
YES
>> Check the error system.
NO
>> GO TO 2.
2.
CHECK HARNESS BETWEEN ECM AND POWER STEERING CONTROL UNIT
1. Turn the ignition switch OFF.
2. Disconnect ECM harness connector E10.
3. Disconnect power steering control unit harness connector.
4. Check continuity between ECM harness connector E10 (A) ter-
minal 94 and power steering control unit harness connector M59
(B) terminal 10.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace damaged parts.
3.
CHECK ENGINE SPEED SIGNAL (ECM SIDE)
1. Turn the ignition switch OFF.
2. Connect ECM harness connector.
3. Check signal between ECM harness connector E10 terminal 94
and ground with oscilloscope.
ECM
Power steering control unit
Continuity
Connector
Terminal
Connector
Terminal
E10 (A)
94
M59 (B)
10
Existed
AWGIA0039ZZ
AWGIA0040ZZ
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