Nissan Altima 2007-2012 Service Manual: How to follow trouble diagnoses


NOTICE: Trouble diagnoses indicate work procedures required to diagnose problems effectively. Observe the following instructions before diagnosing.

• Before performing trouble diagnoses, read the “Work Flow” in each section.

• After repairs, re-check that the problem has been completely eliminated.

• Refer to Component Parts and Harness Connector Location for the Systems described in each section for identification/location of components and harness connectors.

• When checking circuit continuity, ignition switch should be OFF.

• Refer to the Circuit Diagram for quick pinpoint check.

If you need to check circuit continuity between harness connectors in more detail, such as when a sub-harness is used, refer to Wiring Diagram in each individual section and Harness Layout in PG section for identification of harness connectors.

• Before checking voltage at connectors, check battery voltage.

• After accomplishing the Diagnosis Procedures and Electrical Components Inspection, make sure that all harness connectors are reconnected as they were.

How to Follow Test Groups in Trouble Diagnosis

1. Test group number and test group title

1. Test group number and test group title

• Test group number and test group title are shown in the upper portion of each test group.

2. Work and diagnosis procedure

• Start to diagnose a problem using procedures indicated in enclosed test groups.

3. Questions and results

• Questions and required results are indicated in test group.

4. Action

• Next action for each test group is indicated based on result of each question.

Key to Symbols Signifying Measurements or Procedures

How to read wiring diagrams

    How to use this manual
    Description This volume explains “Removal, Disassembly, Installation, Inspection and Adjustment” and “Trouble Diagnoses”. Terms • The captions WARNING and CAUTION warn y ...

    How to read wiring diagrams
    Connector symbols Most of connector symbols in wiring diagrams are shown from the terminal side. • Connector symbols shown from the terminal side are enclosed by a single line and follow ...

    Other materials:

    Removal and installation
    EPS CONTROL UNIT Removal and Installation REMOVAL 1. Remove audio/navi unit. Refer to AV-72, "Removal and Installation" or AV-437, "Removal and Installation" (with navi). 2. Remove power steering control unit (1). 3. Disconnect power steering control unit connector. ...

    Cylinder block
    Disassembly and Assembly 1. Cylinder block 2. O-ring 3. Crankshaft position sensor (POS) 4. Knock sensor 5. Cylinder block heater (if equipped) 6. Lower cylinder block 7. Lower cylinder block bolt 8. Snap ring 9. Connecting rod 10. Connecting rod bearing 11. Connecting rod bearing cap ...

    P1225 TP Sensor
    Description Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement. The throttle position sensor has two sensors. These sensors are a kind of potentiometers which transform the ...