1E-18 Electronic control fuel injection system (Common rail type) Confirmation after repair About confirmation of machine repair It is effective for confirmation of machine repair to use on-board diagnosis (OBD) system check. Mechanic should perform the following steps to diagnose the machine after repair. 1. Review and record the DTC (diagnostic trouble code) or scan tool data used in diagnosis. 2. Clear the DTC. 3. Operate the machine based on scan tool data. 4. Confirm the DTC status information of specified DTC used in diagnosis until the diagnostic test relating that DTC is performed by control unit.
In the case of confirmation of repair by on-board diagnosis (OBD) system check, performing these steps is extremely important. Failure to perform these steps may require unnecessary repair. Confirmation of machine repair If an electronic control system is repaired, it is necessary to confirm that repair is properly performed after the repair work. If this confirmation is not properly performed, it may happen that the diagnosis lamp comes on again or a trouble in operability occurs in the course of delivering the machine to the customer. Especially as for intermittent (trouble), it is needed to reproduce and confirm the situation according to the customer’s complaint.
List of final check items Confirmation of powerful electric wave transmitter; if faults are found in these items, inform a customer of the following check items as required. An antenna should be installed as far away from control unit/sensors or electrical systems on the machine as possible. Antenna codes should be installed at least 20 cm (7.8 in) away from control units/sensors or electrical systems on the machine. Do not put the antenna codes and other wire together. Keep the antenna codes as far away from other wire as possible. When installing an additional equipment, follow its installation manual to install it securely. Do not install mobile communication equipment with high output.
Caution: If confirming repair using on-board diagnosis system check, perform the following steps. If not following these steps, unnecessary repair may be needed. Review and record the scan tool data related to DTC which is diagnosed. Clear the DTC. Operate the machine while checking the relevant scan tool data. No. Item Purpose Method 1 Check of DTC Confirm the DTC display after repair. Clear previous DTC. To gain a test environment, warm-up sufficiently with idling and raise the engine speed to “No Load Max.” to race. 2 Confirmation of idle speed after the engine is warmed-up. To check whether the idling control is normal or not.
Check whether the idle speed after warm-up is stable under no load condition. If the trouble is detected, refer to “Unstable idling” in symptom diagnosis. 3 Check the scan tool data list. Check the engine control and communication status for faults at standard condition. Monitor the scan tool data list and use a typical data sheet to perform the check. Confirm the typical data of scan tool data list. 4 Confirmation of ability of restarting To check whether the starting control is normal. Confirm that after the engine is warmed up. Confirm that the engine starts after less than 5 second of cranking time and becomes stable. 5 Confirmation of powerful electric wave transmitter.
If an electric wave transmitting equipment such as transceiver is additionally installed, confirm whether interfering electric wave is consequently transmitted or not. Check if idling engine speed changes due to “ON” and “OFF” of an electric wave transmitter such as transceiver. If a fault is found, inform a customer of necessity to change the location and output of an electric wave transmitter.