IVECO Bus Fault Codes (part 2)

3.7 On (single-stage valve) does not light (for a two-stage valve) Inadequate supply voltage on the batteries (too low). The idling speed increases depending on the voltage to 200 rpm. above the normal value. Power reduction (only for a motor with a single-stage overpressure valve). Measurement parameters with the diagnostic tool: determine the voltage on the batteries. Carry out the appropriate checks of the voltage regulator, batteries and the power circuit. The voltage of the batteries at the time of verification should not be too low or be recorded by the control unit as unreliable.

3.8 does not illuminate Control lamp-incandescent: short circuit to mass. A). The control lamp of incandescence-burning constantly burns. b). The indicator lamp for incandescence does not light up. Active diagnostics with the diagnostic tool. If the test lamp does not work during active diagnostics, check the bulb's integrity at the terminals of module 14. If the light bulb is OK, check the cable between the light bulb terminal 14 and the control unit (pin B46) through the bushing B, pin 19. There may be an incorrect cold start of the engine, since the glow is working and the test lamp does not light up.

3.9. The control lamp of incandescence-burning. Perhaps increased smoke when starting the engine. Check that the cables are well connected to the heat resistance terminals. Check for undamaged thermal resistance (R and 0.5 Ohm). Check the cable and the connection between the resistance and the heat relay, terminal 87. Check the grounding cable for the heating resistance. The control unit does not receive a signal from the air temperature sensor that the temperature in the suction receiver is increasing, depending on the supply of the heating resistance.

4.6. Motor brake solenoid valve: short circuit in positive connection line, short circuit to ground or open circuit. Motor brake does not work or is permanently activated after the limit is exceeded 1000 rpm. Active diagnostics with the diagnostic tool. Status parameters using the diagnostic tool: check the control of the motor brake. Check that the solenoid valve is intact (R and 35 Ω). If the solenoid valve is OK, check the cables between the solenoid valve connector, pin 1 and the control unit (pin B4) and between the solenoid valve connector, pin 2 and the control unit (pin B11).

5.1 lit. Electric part of injector of cylinder No. 1: short to ground or open circuit. The motor runs on 3 (5) cylinders. Check that the fixing nuts of the electromagnetic injector cables are properly tightened to 1.5 Nm. Check the intactness and resistance of the solenoid valve (R and 0.5 ohms). If the solenoid valve is OK, check the cables in the head between terminals 3 and 4 of the connector and the injector. If the cable in the head is OK, check the cable between the head connector, pin 3 and the control unit (pin A13) and the cable between the head connector, pin 4 and the control unit (pin A9). It is also possible that the motor will run for 2 (3) cylinder, because the nozzles are controlled by two feeding branches. In this case, the control unit can also register a fault 5.7.

5.2. The electrical part of the cylinder 2 injector: a short to ground or an open circuit. The motor runs on 3 (5) cylinders. Check that the fixing nuts of the electromagnetic injector cables are properly tightened to 1.5 Nm. Check the intactness and resistance of the solenoid valve (R and 0.5 ohms). If the solenoid valve is OK, check the cables in the head between terminals 1 and 2 of the connector and the injector. If the cable in the head is OK, check the cable between the head connector, pin 1 and the control unit (pin A3) and the cable between the head connector, pin 2 and the control unit (pin A6). It is also possible that the motor will run for 2 (3) cylinder, because the nozzles are controlled by two feeding branches. In this case, the control unit can register a fault 5.7 (for six-cylinder engines) or 5.8 (for four-cylinder engines).

5.3 lit Cylinder No.3 injector electrical part: short to ground or open circuit. The motor runs on 3 (5) cylinders. Check that the fastening nuts of the electromagnetic injector cables are properly tightened to 1.5 Nm. Check the intactness and resistance of the solenoid valve (R and 0.5 ohms). If the solenoid valve is OK, check the cables in the head between terminals 3 and 4 of the connector and the injector. If the cable in the head is OK, check the cable between the head connector, pin 3 and the control unit (pin A12) and the cable between the head connector, pin 4 and the control unit (pin A4). It is also possible that the engine will run for 2 (3) cylinder, because the nozzles are controlled by two feeding branches. In this case, the control unit can register a fault 5.7 (for six-cylinder engines) or 5.8 (for four-cylinder engines).

5.4. The electrical part of the cylinder 4 injector: a short to ground or an open circuit. The motor runs on 3 (5) cylinders. Check that the fixing nuts of the electromagnetic injector cables are properly tightened to 1.5 Nm. Check the intactness and resistance of the solenoid valve (R and 0.5 ohms). If the solenoid valve is OK, check the cables in the head between terminals 1 and 2 of the connector and the injector. If the cable in the head is OK, check the cable between the head connector, pin 1 and the control unit (pin A5) and the cable between the head connector, pin 2 and the control unit (pin A14). It is also possible that the motor will run for 2 (3) cylinder, because the nozzles are controlled by two feeding branches. In this case, the control unit can register a fault 5.7 (for six-cylinder engines) or 5.8 (for four-cylinder engines).

5.5 lit Cylinder 5 injector electrical part: short to ground or open circuit. The motor operates on 3 (5) cylinders. Check that the mounting nuts of the electromagnetic injector cables are properly tightened to 1.5 Nm. Check the intactness and resistance of the solenoid valve (R and 0.5 ohms). If the solenoid valve is OK, check the cables in the head between terminals 3 and 4 of the connector and the injector. If the cable in the head is OK, check the cable between the head connector, pin 3 and the control unit (pin A16) and the cable between the head connector, pin 4 and the control unit (pin A11). It is also possible that the motor will run for 2 (3) cylinder, because the nozzles are controlled by two feeding branches. In this case, the control unit can also register a fault 5.8.

5.6 Lit The electrical part of the injector of cylinder No. 6: short to earth or open circuit. The motor runs on 3 (5) cylinders. Check that the fixing nuts of the electromagnetic injector cables are properly tightened to 1.5 Nm. Check the intactness and resistance of the solenoid valve (R and 0.5 ohms). If the solenoid valve is OK, check the cables in the head between terminals 1 and 2 of the connector and the injector. If the cable in the head is OK, check the cable between the head connector, pin 1 and the control unit (pin A10) and the cable between the head connector, pin 2 and the control unit (pin A15). It is also possible that the motor will run for 2 (3) cylinder, because the nozzles are controlled by two feeding branches. In this case, the control unit can also register a fault 5.8.

5.7 Cylinder 1-4 injector (four-cylinder engine) or 1-2-3 (six-cylinder engine) is on. The engine is running on 2 (3) cylinders. Announce the memory of the control unit and try restarting the engine. If this malfunction persists, and only after excluding the possibility of a faulty injector (see 5.X), contact the Help Desk and follow their instructions if there is a possible replacement of the control system.

5.8 Cylinder 2-3 (four-cylinder engine) or 4-5-6 (six-cylinder engine) power control. The engine runs on 2 (3) cylinders. Announce the memory of the control unit and try restarting the engine. If this malfunction persists, and only after excluding the possibility of a faulty injector (see 5.X), contact the Help Desk and follow their instructions if there is a possible replacement of the control system.

6.1 On The crankshaft sensor: no signal or inaccurate signal. The motor can not be started. A large reduction in engine power with a single-stage overpressure valve. Low power reduction in the engine with a two-stage overpressure valve. Check the cleanliness and proper mounting of the sensor. Control the purity and integrity of the impulse ring. Check sensor integrity (R and 920 Ω). If the cable is OK, check the cables between the sensor connector, pin 1 and the control unit (pin C25) and between the sensor connector, pin 2 and the control unit (pin C24). The fault 6.1 is always tied to fault 6.3. The engine can not be started, because after a few engine turns the starter turns off.

6.2 lit Camshaft sensor: no signal or inaccurate signal. Difficult start of the engine in all its states. Incorrect injection and smoke during start-up. Low power reduction in the engine with a two-stage overpressure valve. Check the cleanliness and proper mounting of the sensor. Control the purity and integrity of the impulse ring. Check sensor integrity (R and 890 Ohm). If the cable is OK, check the cables between the sensor connector, pin 1 and the control unit (pin C23) and between the sensor connector, pin 2 and the control unit (pin C30). The fault 6.2 is always tied to fault 6.3. If the signal from the camshaft is not in order, the signal from the crankshaft sensor is used for the replacement.

6.3. The uncertainty between the signals from the crankshaft sensor and the camshaft sensor is illuminated. Low power loss. Reading the fault memory of the control unit with the diagnostic tool: the surrounding states are tied to this fault. If this malfunction has been registered at engine rpm below 650 rpm, cancel the fault memory and send the bus. If this malfunction has been registered at engine rpm above b50 rpm, check the intactness of the torsional vibration damper and impulse ring on the crankshaft; to control the cleanliness and proper mounting of the sensors. Sometimes only fault 6.3 is recorded, although in fact it concerns a bad signal from the camshaft. For this reason, carry out the monitoring indicated for troubleshooting 6.2. This malfunction can also be sometimes

off the engine from the motor space. If the torsional vibration damper is damaged, a partial deformation occurs and pressing is performed at the joints of the covers; Traces of silicone appear on the perimeter. To check that there are no patches of adhesive tape on the impulse ring, and that the ring does not have axial oscillation resulting from the impact.

6.4 flashing The excess permissible engine speed. No recognizable change by the bus driver. Engine shutdown (only for a motor with a single-stage overpressure valve). Reading the deck registrar of the control system using the diagnostic tool: determine the essence and possible frequency of this condition. Inform the driver about the correct way of controlling the bus.

6.5 On Motor starter relay: short to ground or open circuit. The motor can not be started. If the engine is running, it turns off. Check the relay intact. Check the intactness between the relay and the control unit (terminal B37).

6.6 OFF The signal for the tachometer: a short to ground or an open circuit. The tachometer does not function. Check the cable intact between terminal 3 of the device and the control unit (terminal B49).

6.8 OFF The synchronization signal between the control unit and the diagnostic tool: a short to ground or an open circuit. Check the cable intact between the terminal 23 of the diagnostic socket and the control unit (pin B48) through the bushing B, pin 11.