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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
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