|
The following test steps may or may not be helpful, they are only a proposal.
- Check the newest Technical Information TI for tips regarding the appeared intermittent problems before proceeding with the diagnostic procedure.
Preliminary diagnostic check (visual inspection)
- Check all sensors, actuators and the wiring harness of the system for corrosion and damages.
- Check all connectors of the system for corrosion and for damaged terminals.
- Check all ground connections of the system for corrosion and damages
- Check if the fault was recognised in an area of strong electromagnetic sources e.g. near radio stations
Diagnostic Trouble Codes
- Read and record trouble codes
- Check for trouble codes with status INTERMITTENT or NOT PRESENT. If a trouble code is stored this may indicate the circuit which has the intermittent condition.
- INTERMITTENT and NOT PRESENT trouble codes are leading to an intermittent problem. This trouble codes refer to a related functional group. To find the defective component the following test steps may be helpful.
- Use the following table to obtain the concerned functional group and perform the following additional test steps, while performing the troubleshooting in the C-x tables.
Move the related connectors, wiring harness and components in order to find the failure. Switch on all electric consumers by turns, because this can cause an electromagnetic interference in a circuit. Use the TECH 31/32 or an oscilloscope to observe the wiring harness for disturbances. Operate the system under different conditions over a considerable time.
Snapshot function of the Diagnostic tester and TIS/TIS 2000
- Select the snapshot function of the Diagnostic Tester. Set the Diagnostic Tester to trigger on ANY CODE/CENTER and try to recreate the conditions that may cause the intermittent trouble code to be set (use the customer complaint information). Use the Diagnostic tester or TECH 31/32 application to analyse the related data list parameters.
The disturbances in the signal can be observed at the trigger point where the trouble code is set.
Use the following table to obtain the concerned functional group and perform the following additional test steps, while performing the troubleshooting in the C-x tables.
Move the related connectors, wiring harness and components in order to find the failure. Switch on all electric consumers by turns, because this can cause an electromagnetic interference in a circuit. Use the TECH 31/32 or an oscilloscope to observe the wiring harness for disturbances. Operate the system under different conditions over a considerable time.
After successful test/fault repair proceed to the next test step
|
|
