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:
P0443 evap canister purge volume
control solenoid valve
Description
The EVAP canister purge volume control solenoid valve uses a ON/
OFF duty to control the flow rate of fuel vapor from the EVAP canister.
The EVAP canister purge volume control solenoid valve is
moved by ON/OFF pulses from the ECM. The longer the ON pulse,
the greater the amount o ...
Power supply and ground circuit (sedan)
AUDIO UNIT
Diagnosis Procedure
1.CHECK FUSES
Check that the following fuses are not blown.
Are the fuses OK?
YES >> GO TO 2
NO >> If fuse is blown, be sure to eliminate cause of malfunction before
installing new fuse.
2.POWER SUPPLY CIRCUIT CHECK
1. Disconnect audio u ...
B2109 steering lock relay
Description
The steering lock relay ON signal is transmitted to IPDM E/R by BCM via CAN
communication.
IPDM E/R turns the steering lock relay ON and transmits the release of the
steering to BCM.
DTC Logic
DTC DETECTION LOGIC
NOTE:
• If DTC B2109 is displayed with DTC U1000, first perf ...