How To Perform Trouble Diagnosis For Quick and Accurate Repair: Introduction

The TCM receives a signal from the vehicle speed signal, ECM (throttle opening) or PNP switch and provides shift control or lock-up control via A/T 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 A/T 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 A/T system. The A/T system must be in good operating condition and be free of valve seizure, solenoid valve malfunction, etc.

Fig 1: Identifying Sensors And Solenoid Valves

Courtesy of NISSAN MOTOR CO., U.S.A.

It is much more difficult to diagnose an error that occurs intermittently rather than continuously. Most intermittent error 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-II (or GST) or a circuit tester connected should be performed. Follow the "WORK FLOW ".

Fig 2: Checking Causes Using Information

Courtesy of NISSAN MOTOR CO., U.S.A.

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 Worksheet" as shown on the example (Refer to DIAGNOSTIC WORKSHEET ) 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.

Fig 3: Identifying Correct Malfunction Path

Courtesy of NISSAN MOTOR CO., U.S.A.