Bus & Coach Manuals PDF, Wiring Diagrams

SOR Bus Blink Codes EDC

TROUBLESHOOTING

For correct troubleshooting, it is always necessary to carry out comprehensive diagnostics using the means intended for this purpose. These devices to us on the display will show successively the operations that need to be performed for the chosen diagnostics.

In addition, there is a list of flashing codes, complementary to troubleshooting, but can not replace preventive diagnostics using diagnostic tools.

In the event of a deviation from normal operation, it is possible to diagnose the current faults or malfunctions registered in the memory of the motor control computer.

- Turn on the main switch.

- Turn on the control.

- The test lamp will turn off several times in a row and turn on again and the number of flashes will determine the fault code.

The fault code is defined by two series of quick flashes, which are interrupted by the lamp shutting off for a period of three seconds.

Adding the flashes of each series, we determine two figures. The combination of these two digits corresponds to a specific fault code.

To repeat the following faults, repeat the operation.

Table of blinking EDC codes

Note:

Control lamp of flashing codes the control lamp does not light = a small fault (no restrictions, monitoring if possible)

Control lamp of blinking codes control lamp on = average fault (continue driving to the nearest repair shop)

The flashing code warning lamp flashes = very important fault (do not continue in motion)

TROUBLE CODE

CONTROL LAMP - the status indicator lamp is on, the control lamp is off, blinking.

POSSIBLE REASON

SYSTEM / BUS SYSTEM REACTION

RECOMMENDED TESTS AND ACTIONS

NOTES

1.1

control lamp is on

The signal about the bus speed exceeded the maximum or minimum limit (a short circuit of the wiring is possible).

The tachograph does not work (if there is a fault between the sensor and the tachograph).

Cruise Control does not work (only for an engine with a single-stage overpressure valve).

Measuring parameters with the diagnostic tool: in case of this fault, the speed in the control unit remains constant at a value of 5 km / h. Reading the fault memory of the control system: if the fault is occasional, check that the connectors are not fixed. If the fault is actual, carry out the following checks:

a). if the tachograph does not operate, monitor the electrical wiring and connectors between the sensor and the tachograph;

b). if the tachograph is working, check the correct installation, cleanliness and working clearance of the sensor.

If the fault persists, monitor the electrical wiring and the connectors between the sensor and the control unit (terminal B74) through the bushing B, terminal 13.

The fault is only registered when the bus is moving and only if there is a short circuit in the circuit.

If no signal is received, then the control unit does not record any fault and "believes" that the bus is standing.

1.2

Not used

1.3

the control lamp is on (with a single-stage valve)

the control lamp does not light (for a two-stage valve)

Invalid signal from the buttons of the Cruise Control function / side drive.

Cruise Control / side drive and idle speed setting does not work.

Status parameters using the diagnostic tool: monitor the signals from individual switches.

Control the resistance of the multimeter directly on the connector of the lever switch at the switch causing the fault.

If the button is OK, monitor the cable between the connector of the lever switch and the control unit (terminal B61) through the bushing E, terminal 32 for the switch SET-, between the connector of the lever switch and the control unit (terminal B79) through the bushing E, terminal 34 for the switch SET +, between the connector of the lever switch and the control unit (terminal B59) through the bushing E, terminal 33 for the RESUME switch and between the connector of the lever switch and the control unit (terminal B60) through the bushing E, terminal 31 for the switch OFF.

The invalidity of the signal is recorded if a signal comes simultaneously from the switches SET and SET + or from the switches RESUME and OFF.

1.4

control lamp is on

Short circuit on the potentiometer of the fuel feed pedal.

Reduced power.

With the fuel feed pedal free, the idle speed reaches its highest value (about 1100 rpm).

By depressing the fuel feed pedal, the engine jumps and uncontrolled increases the speed (about 2600 rpm).

Measuring parameters with the diagnostic tool: confirm the correct operation of the potentiometer between 0% and 100%. If it is not reached reading the parameters to confirm the correct functioning of the potentiometer, measure the multimeter with its intactness (R ≈ 1.0 kΩ between terminals 2 and 3 of the pedal connector); to control the linear change of resistance, depending on the depression of the pedal between the extreme positions between the terminals 1 - 3 and the terminals 2 - 3 of the pedal connector.

1.4

control lamp is on

Loss of signal from the potentiometer of the fuel delivery pedal (chain breakage possible).

Reduced power.

Idling turns increase at any position of the fuel delivery pedal (approx. 1100 rpm).

1.4

control lamp is on

Invalid signal between the idle switch and the potentiometer of the fuel feed pedal.

a). the idling speed increases with the free fuel pedal (approx. 1100 rpm) and the engine "gas" after pressing the fuel pedal in the order,

b). idling speed is OK, and there is a decrease in speed and power when "gas".

Measuring parameters with the diagnostic tool: confirm the correct operation of the potentiometer between 0% and 100%.

Status parameters with the diagnostic tool: confirm the correct operation of the ON-OFF switch.

a). Check with the multimeter the undamaged idle switch between terminals 4 and 5 of the pedal connector; if the switch is in order to monitor the cables between the pedal connector pin 4 and the control unit (pin B50) through the bushing B, the pin 33 and between the pedal connector, pin 5 and the control unit (pin B73) through the bushing B, terminal 32.

b). Check the potentiometer's intactness with a multimeter if the potentiometer is OK, monitor the cable intact between the pedal connector and the control unit connector.

a). the signal from the potentiometer is OK and reports that the fuel feed pedal is free, but the state of the switch indicates that the fuel pedal is depressed,

b). the signal from the switch is OK and reports that the fuel feed pedal is free, but the signal from the potentiometer indicates that the fuel pedal is depressed.

1.5

the control lamp is on (with a single-stage valve)

the control lamp does not light (for a two-stage valve)

Clutch switch: inaccurate signal

Cruise Control does not work.

Status parameters using the diagnostic tool: confirm the correct operation of the switch.

Check the LED test lamp under the plastic protective cover (with the free clutch pedal, the test lamp should be on). If the sensor is in order and correctly laid, check the electrical wiring, connectors and proper sensor adjustment (distance from the pedal: 1 ÷ 3 mm).

If there is no signal to press the pedal, the control unit does not notify the cause and considers this state to be normal.

Cruise Control does not work because the control unit "believes" that the pedal is constantly depressed.

ATTENTION: make sure the cable is routed so that it does not come to its compression and damage when the clutch pedal is depressed.

1.6

control lamp is on

Brake switches: unreliable signals between the primary and secondary switch.

Brake lights must not light.

Cruise Control does not work.

Status parameters with the diagnostic tool: confirm the correct and timely activation of both brake switches.

With a multimeter, check the short circuit on the connector of the switches.

If the switches are not damaged, check the cables between the switch connector, pin 4 and the control unit (pin B76) and between the switch connector, pin 2 and the control unit (pin B80) via IBC and bushing B, pin 31.

1.7.

the control lamp does not light

Unreliable signals between the brake pedal and the fuel pedal or the simultaneous depression of both pedals.

The engine speed is lowered to the idling limit.

Status parameters using the diagnostic tool: Check the signal from the potentiometer after releasing the accelerator pedal.

It is possible that the driver could also press both pedals simultaneously.

If the brake pedal is depressed simultaneously with the fuel pedal, the engine speed is reduced, while holding the fuel pedal at the idle speed limit so that it is possible to stop the bus, even though the fuel pedal is locked in the safety mode. In spite of this, it is allowed to "gas" with the brake pedal depressed without the safety mode.

1.8

the control lamp does not light

Defective control lamp on the optical panel.

Power reduction (only for an engine with a single-stage overpressure valve). The indicator lamp never lights up when the ignition key is turned on or remains lit after the ignition key is turned off.

Active diagnostics using a diagnostic tool.

If the test lamp does not work during active diagnostics, check the bulb's integrity between terminals 12 and 13 of the module.

If the light bulb is OK, check the cable between the light bulb terminal 12 and the control unit (terminal B28) through the bushing B, the terminal 7 and between the light bulb terminal 13 and the control unit (terminal B28) through the bushing B, terminal 8.

Proper operation of the warning lamp is a vital eye to the problem-free functioning of the system.

Explain to the user the procedure for correctly confirming the activity of the warning lamp (if the system does not have a malfunction, after turning on the key, the test lamp should light up for about 2 seconds, then go out).

1.9

the control lamp is on (with a single-stage valve)

the control lamp does not light (for a two-stage valve)

Motor (exhaust) brake selector: an invalid signal or loss of interconnection, depending on the control of the motor brake.

The engine (exhaust) brake is activated only after the pedal is depressed on the floor of the cabin or after the pedal is depressed it can not be switched on and can only be operated in the next two selector positions.

Status parameters using the diagnostic tool: check the signal from the engine brake switch.

If the signal does not come from the selector to the control unit, check with the multimeter that the selector switch is correctly connected between terminals 6 and 8 of the connector.

If the selector is OK, check the cables between the selector connector, terminal 6 and the control unit (output B38) through the bushing E, terminal 36 and between the selector connector, the terminal 8 and the control unit (output B22) through the bushing E, terminal 35.

2.1

control lamp is on

Coolant temperature sensor:

short circuit in the positive branch connection,

short to ground or open circuit.

The arrow of the temperature indicator in the limit position, the indicator lamp lights up the control lamp.

Measuring parameters with the diagnostic tool: in the event of this fault, the temperature read in the parameters is half that of the engine oil.

Check with a multimeter for sensor intactness between terminals 1 and 2 (at a temperature of 20 ° C, the resistance is approximately 2.5 kΩ).

If the sensor is in order to monitor the cables between the sensor, pin 1 and the control unit (pin C18) and between the sensor, pin 2 and the control unit (pin C36).