Nissan Altima 2007-2012 Service Manual: Vehicle speed signal circuit
Description
• Combination meter sends vehicle speed signal to power steering control unit.
Diagnosis Procedure
1.PERFORM COMBINATION METER SELF-DIAGNOSIS
Perform combination meter self-diagnosis.
Is any error system detected? YES >> Check the error system.
NO >> GO TO 2.
2.CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT
1. Turn the ignition switch OFF.
2. Disconnect combination meter harness connector.
3. Disconnect power steering control unit harness connector.
4. Check continuity between combination meter harness connector M24 (A) terminal 30 and power steering control unit harness connector M59 (B) terminal 8.
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 VEHICLE SPEED SIGNAL (COMBINATION METER SIDE)
1. Turn the ignition switch OFF.
2. Connect combination meter harness connector.
3. Check combination meter input/output standard values. Refer to MWI-59, "Reference Value".
Is the inspection result normal? YES >> GO TO 4.
NO >> Replace combination meter. Refer to MWI-176, "Removal and Installation".
4.CHECK VEHICLE SPEED SIGNAL (POWER STEERING CONTROL UNIT SIDE)
1. Turn the ignition switch OFF.
2. Connect power steering control unit harness connector.
3. Check signal between power steering control unit harness connector M59 terminal 8 and ground with oscilloscope.
Also check harness for short to ground and short to power.
Is the inspection result normal? YES >> GO TO 5.
NO >> Replace power steering control unit.
5.CHECK TERMINALS AND HARNESS CONNECTORS
• Check power steering control unit pin terminals for damage or loose connection with harness connector.
• 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.
Engine speed signal circuit
Description
• ECM sends engine speed signal to power steering control unit.
Diagnosis Procedure
1.PERFORM ECM SELF-DIAGNOSIS
Perform ECM self-diagnosis.
Is any error system detected?
YES ...
ECU diagnosis
POWER STEERING CONTROL UNIT
Reference Value
TERMINAL LAYOUT
PHYSICAL VALUES
CAUTION:
When using circuit tester or oscilloscope to measure voltage for inspection, be
sure not to extend for ...
Other materials:
AMP on signal circuit
Description
When the audio system is turned on, a voltage signal is supplied from the
audio unit to the BOSE speaker
amp. When this signal is received, the BOSE speaker amp. will turn on.
Diagnosis Procedure
1.CHECK AMP ON SIGNAL (BOSE SPEAKER AMP)
1. Turn audio system ON.
2. Check voltag ...
Accelerator pedal released position
learning
Description
Accelerator Pedal Released Position Learning is a function of ECM to learn
the fully released position of the
accelerator pedal by monitoring the accelerator pedal position sensor output
signal. It must be performed each
time harness connector of accelerator pedal position sensor ...
Precaution
Supplemental Restraint System (SRS) "AIR B
AG" and "SEAT BELT PRE-TENSIONER"
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”,
used along
with a front seat belt, helps to reduce the risk or severity of injury to the
driver and fron ...