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module 

673

2.2.7 Diagnostic information and procedures 

2.2.7.1 Diagnosis descriptions 

Before carrying out the control system diagnostic, refer to “2.12.2 Description and 
Operation” and “2.12.3 System Operating Principle”. 

Understand and get familiar with 

control system operating principle, and then start systematic diagnostic, so that it will help to 
determine the correct diagnostic steps. More importantly, it will also help to determine whether 
the situation described by the customer is normal. 

Any control system fault diagnosis should start with Control System Inspection. Control System 
Inspection will guide the service personnel to take the next logical step to diagnose the fault. 
Understand and correctly use the diagnostic flow chart can reduce the diagnostic time and avoid 
misjudge on components. 

2.12.7.2 Inspection of control system 2.12.7.6 Definition of type of fault diagnosis code 

Before inspecting the control system, please do the following primary inspections: 

1.  Inspect the battery terminal voltage to ensure an adequate power supply and a stable voltage. 

2.  Inspect the battery cables, clean and tighten. 

3.  Inspect the system components easy to access or visible to determine whether there are 

obvious damages that may cause the symptoms, such as the damage to the vacuum tube and 
the connection reliability of wiring harness connectors. 

4.  Inspect whether the control module and battery main ground points are normal and whether 

the copper plates at the ground points have oxidation, loose or other signs. 

5.  Check whether the control system is equipped with after-sales additional devices which may 

influence its normal operation. 

Diagnostic Steps: 

1 

Verify customer described faults. 

 

2 

Connect a fault diagnosis tester. 

(a)  Install the fault diagnosis tester. 

(b)  Connect the power supply of the fault diagnosis tester. 

Is power supply of the fault diagnosis tester connected?

 

 

3 

Start communication between the fault diagnosis tester and the engine control module.

(a)  Turn on the ignition switch, but do not start the engine. 

(b)  Try to establish communication between the scan tool and engine control module (ECM) . 

Can the fault diagnosis tester communicate with engine control module? 

 

No 

Go to step 14 

Yes 

No 

Go to step 11 

Yes 

Next 

674