🔍 Key Concepts

• Use the trouble analysis flow chart for fault code 41 (SPEED LOG ERROR) step‑by‑step, from top to bottom. • Remember standard troubleshooting logic: start with simple checks (signal and wiring) before replacing major assemblies. • Note that the chart usually moves from checking the external speed log signal toward the internal ADS/CPU hardware as later steps.

💭 Think About

• On the chart for code 41, what is the first action box after “fault displayed”? Then, which actions follow it in sequence? • Between checking signal output, checking cabling, replacing CPU, and replacing ADS, which ones are verification tests and which are hardware swaps? Hardware swaps normally come later—what is the very last box in that branch? • If the message string from the speed log and the cabling both check out, what does the manufacturer’s chart say to do next, and what is the final escalation step?

✅ Before You Answer

• Carefully trace only the branch that corresponds to Fault Code 41 – SPEED LOG ERROR; ignore other codes. • Confirm the exact order of the boxes along that branch and identify which is printed as the final corrective action. • Make sure you are not stopping at an intermediate “if NG (no good)” step—follow the arrows all the way to the last box before the flow returns to normal.