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The following test steps may or may not be helpful, they are only a proposal.
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Diagnostic Trouble Codes
- Read and record diagnostic trouble codes including status
- 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.
- 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.
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Quick Check
- Select the following Functional System on the diagnostic tester:
Electronic Diesel Injection System EDC 16C9, Z 17 DTL, Z 17 DTH
- Perform the following evaluation:
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- The following control units can impair the system function:
ABS/TC/ESP (Vehicle Dynamic System)
Heating, Ventilation and Air Conditioning System
ECC/SAC (Electronic Climate Control)
The checking of the corresponding Data List / Actuator Tests may or may not be helpful.
- After successful test/fault repair proceed to the next test step
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