What
Start with the reason the check matters. Engine status is not a fuel reading and not a movement reading. On most installs it is a voltage-sense input on the ignition line, while some units read ignition state from the vehicle bus instead. Either way it answers one narrow question: is the key turned and the circuit live. Every other number inherits that state, including engine hours, idle time, and the way activity is counted for billing. If the state is wrong or missing, your cost per vehicle drifts from what the invoice says, and you find out during reconciliation rather than at budget time. So verify first, then plan.Step one is to identify the device. Note the unit ID printed on the hardware and match it to your install sheet and the paperwork on file for Rajasthan GPS compliance. A mismatch here is cheap to fix today and awkward to explain in a later review. While you have the paperwork open, confirm the unit ID on the record matches the one physically fitted, not just the one in the spreadsheet.Step two is to establish what the device is sensing. Ask whether it reads the ignition line by voltage or from the vehicle bus. The two behave differently, and knowing which one you have changes how you read every report that follows.Step three is a live state test. Turn the key on with the engine not running, then let the vehicle idle. Watch the platform. You want ignition-on with zero speed at the right moments. A vehicle idling reports ignition-on with zero speed, and most platforms class that as idle time rather than driving time, which is exactly the label you need to see land correctly.Step four is to read one week of trip records for that single vehicle against the driver's log. Split trips and unexplained gaps are the signature to look for. Signal quality is the usual cause. Tunnels, dense flyovers, and rough electrical conditions can cause brief voltage dips that get logged as ignition-off, which chops one journey into several trip records. On a mid-sized fleet running daily routes, that splitting quietly shifts the idle percentages you use to assign cost per vehicle.Step five is to compare reported engine hours with idle time for the same unit. When idle time looks implausibly low, suspect the threshold settings before you suspect the drivers. Idle thresholds, ignition debounce windows, and geofence alert triggers interact, so adjusting one can shift the behaviour of the others. Raise an idle threshold to cut false alerts and you may stop recording genuine idling events, which under-reports time on site.Then follow the decision path. Test the suspect unit beside a known-good vehicle on the same route. If both report the same way, the problem is fleet-wide and likely configuration. If only one misreports, look at the wiring, because ignition wiring and detection settings are configured unit by unit, and two identical trucks prepared by different technicians can report different engine hours from the same route.What does this mean for your budget? Both outcomes leave engine hours wrong, so any cost per vehicle built on them is not yet defensible. Tune when the mismatch stays steady across representative routes and the device clearly reports ignition state. Reconfigure when debounce, idle thresholds, and alert windows appear to be working against each other, which often shows up as delayed alerts with no hardware fault present. Replace when a device cannot report ignition state reliably under your operating conditions, confirmed by comparison testing. Be clear about the limit here: platform settings cannot repair a wiring fault, and no correction factor should be applied without test evidence.Finally, keep a written record. Log the date, the unit, and every settings change, because that is what makes a later compliance review answerable from notes rather than memory. Confirm current field and retention expectations against the rules in force rather than assuming a fixed period, and treat this as a method rather than a statement about any specific device brand. Once the data holds still for a full month, your reconciliation closes on time and your next quarter's fleet cost plan has something solid underneath it.