LAUNCH TECH CRP 429HD - EOBDII Diagnosing

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LAUNCH CRP 429HD User's Manual
Generally, there are three elements for one J1939 DTC (See Figure 5-7):
• SuspectParameterNumber(SPN)–IndicateswhatfunctionontheECUhas
failed.
• FailureModeIndicator(FMI)–Indicatesinwhatwaythefunctionfailed.
• Occurence(OC)–IndicatestheoccurencetimesofthecurrentDTC.
Whereas, if we choose [J1587/1708], the fault code includes:
• SubsystemIdentier(SID)–IndicateswhatfunctionontheECUhasfailed.
• FailureModeIndicator(FMI)–Indicatesinwhatwaythefunctionfailed.
• Occurence(OC)–IndicatestheoccurencetimesofthecurrentDTC.
*Note: Retrieving and using DTCs for troubleshooting vehicle operation is only one
part of an overall diagnostic strategy. Never replace a part based only on the DTC
denion. Each DTC has a set of tesng procedures, instrucons and ow charts that
must be followed to confirm the location of the problem. This information can be
found in the vehicle’s service manual.
3. Clear diagnostic trouble code
This option allows you to clear the existing or historic trouble codes.
ClearingDTCsdoesnotxtheproblem(s)thatcausedthecode(s)tobeset.If
proper repairs to correct the problem that caused the code(s) to be set are not
made, the code(s) will appear again and the check engine light will illuminate as
soon as the problem that cause the DTC to set manifests itself.
*Note: Aer clearing, you should retrieve trouble codes once more or turn ignion
on and retrieve codes again. If there are still some trouble codes in the system,
please troubleshoot the code using a factory diagnosis guide, then clear the code and
recheck.
4. Data stream
This option enables you to read the real-time data stream in character or graphic
form.
*Note: If you must drive the vehicle in order to perform a troubleshoong procedure,
ALWAYS have a second person help you. Trying to drive and operate the CRP 429HD at
the same me is dangerous, and could cause a serious trac accident.
5.3.2 EOBDII Diagnosing
On Fig. 5-5, tap [EOBD II] to start initializing. Once the initialization is complete,
a screen displaying Monitor Status appears. Tap [OK] to enter the function
selection page.