Nissan Altima 2007-2012 Service Manual: Diagnosis and repair workflow

Work Flow

INTRODUCTION

The TCM receives a signal from the vehicle speed sensor, PNP switch and provides shift control or lock-up control via CVT solenoid valves.

The TCM also communicates with the ECM by means of a signal sent from sensing elements used with the OBD-related parts of the CVT system for malfunction-diagnostic purposes. The TCM is capable of diagnosing malfunctioning parts while the ECM can store malfunctions in its memory.

Input and output signals must always be correct and stable in the operation of the CVT system. The CVT system must be in good operating condition and be free of valve seizure, solenoid valve malfunction, etc.

It is much more difficult to diagnose an error that occurs intermittently rather than continuously. Most intermittent errors are caused by poor electric connections or improper wiring. In this case, careful checking of suspected circuits may help prevent the replacement of good parts.

A visual check only may not find the cause of the errors. A road test with CONSULT-III (or GST) or a circuit tester connected should be performed. Follow the “DETAILED FLOW”.

Before undertaking actual checks, take a few minutes to talk with a customer who approaches with a driveability complaint. The customer can supply good information about such errors, especially intermittent ones. Find out what symptoms are present and under what conditions they occur. A “Diagnostic Work Sheet” as shown on the example (Refer to TM-86) should be used.

Start your diagnosis by looking for “conventional” errors first. This will help troubleshoot driveability errors on an electronically controlled engine vehicle.

Also check related Service bulletins.

DETAILED FLOW

1.COLLECT THE INFORMATION FROM THE CUSTOMER

Get the detailed information from the customer about the symptom (the condition and the environment when the incident/malfunction occurred) using diagnosis worksheet. Refer to TM-86, "Diagnostic Work Sheet".

>> GO TO 2.

2.CHECK SYMPTOM 1

Check the following items based on the information obtained from the customer.

• Fail-safe. Refer to TM-219, "Fail-safe".

• CVT fluid inspection. Refer to TM-240, "Inspection".

• Line pressure test. Refer to TM-247, "Inspection and Judgment".

• Stall test. Refer to TM-245, "Inspection and Judgment".

>> GO TO 3.

3.CHECK DTC

1. Check DTC.

2. Perform the following procedure if DTC is detected.

• Record DTC.

• Erase DTC. Refer to TM-117, "Diagnosis Description".

Is any DTC detected? YES >> GO TO 4.

NO >> GO TO 6.

4.PERFORM DIAGNOSTIC PROCEDURE

Perform “Diagnostic Procedure” for the displayed DTC.

>> GO TO 5.

5.PERFORM DTC CONFIRMATION PROCEDURE

Perform “DTC CONFIRMATION PROCEDURE” for the displayed DTC.

Is DTC detected? YES >> GO TO 4.

NO >> GO TO 6.

6.CHECK SYMPTOM 2

Try to confirm the symptom described by the customer.

Is any malfunction present? YES >> GO TO 7.

NO >> INSPECTION END

7.RODE TEST

1. Perform “RODE TEST”. Refer to TM-249, "Description".

>> GO TO 8.

8.CHECK SYMPTOM 3

Try to confirm the symptom described by the customer.

Is any malfunction present? YES >> GO TO 2.

NO >> INSPECTION END

Diagnostic Work Sheet

INFORMATION FROM CUSTOMER

KEY POINTS

• WHAT..... Vehicle & CVT model

• WHEN..... Date, Frequencies

• WHERE..... Road conditions

• HOW..... Operating conditions, Symptoms

DIAGNOSTIC WORK SHEET

    Inspection and adjustment
    ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT Precaution for TCM and CVT Assembly Replacement CAUTION: • Check if new data (Unit ID) are entered correctly after replacing CVT assembly and er ...

    Other materials:

    P0740 torque converter clutch solenoid valve
    Description • The torque converter clutch solenoid valve is activated by the TCM in response to signals sent from the vehicle speed and accelerator pedal position sensors. Lock-up piston operation will then be controlled. • Lock-up operation, however, is prohibited when CVT fluid temper ...

    Lifting point
    Special Service Tool The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here. CAUTION: • Every time the vehicle is lifted up, maintain the complete vehicle curb condition. • Since the vehicle's center of gravity changes when removing main ...

    Vin registration
     Description VIN Registration is an operation to register VIN in ECM. It must be performed each time ECM is replaced. NOTE: Accurate VIN which is registered in ECM may be required for Inspection & Maintenance (I/M).  Special Repair Requirement 1.CHECK VIN Check the VIN of ...