MAN FFR Onboard Computer User Manual

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MAN FFR Onboard Computer Fault codes list

Code (SPN)

Description

The reason, check and reaction of the system.

32

The state of the divider.

Priority 3. Indication only when the car is stationary, only indication of the
fault, the indication of actions for the error is not required. On Still Car
Lights the alarm lamp STOP Yellow. The state of the divider could not be
determined for the specified measurement time. Check the circuit, the pins
in the connectors and the accuracy of the speed sensor readings at the input
of the gearbox (in 368). Check the accuracy of the rotation signal using the
PC. Check resistance: from side FFR Between Contacts Х3/12 (+) and х1/3 (-)
resistance should correspond to approximately 1.78 Kom, on the part of the
sensor resistance should correspond to approximately 1.05 Kom. Check the
voltage between the unit pins FFR Х3/12 (+) and х1/3 (-), the voltage should
equal approximately 1 v. At idle. WhenTagging: see SPN 770 and 771.

161

Rotational speed at the
input of the gearbox.

Priority 3. Indication only when the car is stationary, only indication of the
fault, the indication of actions for the error is not required. On a stationary
car the warning lamp is illuminated STOP Yellow. Incorrect signal from the
speed sensor at the input of the gearbox (in 368) the status "Signal
unavailable" is set, it is impossible to determine the state of the divider, the
function "Comfort-ShiftLocked. Check the circuit, the pins in the connectors
and the accuracy of the speed sensor readings at the input of the gearbox (in

368). Check the accuracy of the rotation signal using the PC. Check
resistance: from side FFR Between Contacts Х3/12 (+) and х1/3 (-) resistance
should correspond to approximately 1.78 Kom, on the part of the sensor
resistance should correspond to approximately 1.05 Kom. Check the voltage
between the unit pins FFR Х3/12 (+) and х1/3 (-), the voltage should equal
approximately 1 v. At idle.

168

Battery voltage

Priority 3. Indication only when the car is stationary, only indication of the
fault, the indication of actions for the error is not required. On a stationary
car the warning lamp is illuminated STOP Yellow. The operating voltage is
more than 32 v. Check the accuracy of the signal using a PC, check wiring,
pins in connectors, generator and batteries. Check the voltage on the contact
unit FFR Х1/2, X1/1 (+), х1/3 (-), the voltage must be
Between 20 and 28 v. If the voltage measured on the connectors is
Block FFR Normal, replace the unit FFR.

168

battery power supply
voltage.

Priority 3. Indication only when the car is stationary, only indication of the
fault, the indication of actions for the error is not required. On a stationary
car the warning lamp is illuminated STOP Yellow. The operating voltage is less
than 16 v. Check the accuracy of the signal using a PC, check wiring, pins in
connectors, generator and batteries. Check the voltage on the contact unit
FFR Х1/2, Х1/1 (+), х1/3 (-), the voltage should be within the limits between
20 and 28 v. If the voltage measured on the connectors of the Unit FFR
Normal, replace the unit FFR.

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572

Auxiliary device for the
activation of the retarder
brake.

Priority 5: Indication during stop and during vehicle movement. Signal Lamp
STOP is lit in yellow and during movement and during stop or parking. The
wiring of the data line from the touch control switch to the retarderer is
faulty. The switch stops functioning. The included brake retardeactivates by
pressing the accelerator pedal. Check the accuracy of the signal using the PC,
check the wiring, pins in the connectors, touch the brake-retarderer. Check
the resistance of the data transmission line from the touch switch, between
the unit pins FFR Х2/10 (+) and х1/3 (-) on the side of the block FFR Approx.

1.5 PTO, on the car side approximately 1.6 pto. Check the wire resistance of
the touch switch of the retarder, between the pins of the unit FFR X2/6 (+)
and x 1/3 (-) on the side of the block FFR Approximately 1.7 IOM, on the side
of the car approximately 1.2 IOM. Check the voltage of the data transmission
line from the touch switch, between the unit pins FFR X2/10 (+) and х1/3 (-),
jumper (test block) Closed: approx. 14.2 v., jumper (test block) Open: On the
side of the unit FFR Approx. 23.5 in, on the side of the car approx. 14 v. Check
the voltage of the timing wire of the retarder touch switch, between the unit
pins FFR Х2/6 (+) and x 1/3 (-) jumper (test block) Closed: approx. 12.3 v.,
jumper (test block) Open: On the side of the unit FFR Approximately 13.5 v.,
on the side of the car approximately 22.5 v.

697

Accelerator pedal, Signal
PWM1 (signal pulse
modulation).

Priority 2: A malfunction that requires removal from the service center. Signal
Lamp STOP Lights up permanently in red. Missing or incorrect signal PWM1
Accelerator pedal (a 410). To identify the position of the accelerator pedal, a
signal is PWM2. Engine speed and torque are limited (1800 RPM and 80%
limit). Check the accuracy of the signal PWM1 with PC, check wiring, pins in
connectors. Perform measurement using a portable oscilloscope Fluke
ScopeMeter 123 or similar device (frequency 200 Hz). Check the voltage on
the unit FFR Between pins х2/11 (+) and х1/3 (-): The jumper (Test block) is
closed, the signal Low: (The accelerator pedal is fully pressed) approx. 8 v.,
the Signal HIGH: approx. 20 v.; Jumper (test block) Open: On the side of the
unit FFR Approx. 25.4 v., on the side of the car approx. 0.5 v. If the problem is
not found, try recalibrating the accelerator pedal.
If the voltage drop when the ignition is on, the PWM1 (а410/pin5) and power
supply on PWM2 (а410/pin6) is more than 100 MS, the fault code is
registered.

698

Accelerator pedal, Signal
PWM2 (signal pulse
modulation).

Priority 2: A malfunction that requires removal from the service center. Signal
Lamp STOP Lights up permanently in red. Missing or incorrect signal PWM2
Accelerator pedals (a 410). To identify the position of the accelerator pedal, a
signal is PWM1. Engine speed and torque are limited (1800 RPM and 80%
limit). Check the accuracy of the signal PWM2 using PC, check wiring, pins in
connectors. Perform measurement using a portable oscilloscope Fluke
ScopeMeter 123 or similar device (frequency 200 Hz). Check the voltage on
the unit FFR Between pins х2/18 (+) and х1/3 (-): The jumper (Test block) is
closed, the signal Low: approx. 8 v., Signal HIGH (Accelerator pedal is fully
pressed): approx. 20 v.; Jumper (test block) Open: On the side of the unit FFR
Approx. 25.5 v., from the car side approx. 0 v. If the problem is not found, try
recalibrating the accelerator pedal.
If the voltage drop when the ignition is on, the PWM1 (а410/pin5) and power
supply on PWM2 (а410/pin6) is more than 100 MS, the fault code is
registered.

770

Раздельный H.

Priority 5: Indication during stop and during vehicle movement. Signal Lamp
STOP is lit in yellow and during movement and during stop or parking.
Malfunction in electromagnetic valve wiring detected SPLIT-HIGH (Y307). The
malfunction is recorded in the fault recorder in case the malfunction is
recorded during three cycles of measurement (500 ms). The divider valve
stops being controlled.
Using a PC, you can test the elements "SPLIT-HIGHandSPLIT- LOW". Check
resistance between pins х3/13 (+) and х4/6 (-): On the side of the block FFR
Approximately 6 Kom, on the car side approximately 83.3 ohm. Check
resistance between pins х3/13 (+) and х1/3 (-): On the side of the block FFR
approx. 4.3 com, on the side of the car

---. Check the voltage between the unit pins FFR {3/13 (+) and х4/6 (-): At an
activated electromagnetic valve approximately 27.6 v. At the deactivated
valve approximately 0 v.

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771

Раздельный.

Priority 5: Indication during stop and during vehicle movement. Signal Lamp
STOP is lit in yellow and during movement and during stop or parking.
Malfunction in electromagnetic valve wiring detected SPLIT-LOW (Y307). The
malfunction is recorded in

Fault recorder in case the fault is registered during three cycles of
measurement (500 ms). The divider valve stops being controlled. Using a PC,
you can test the elements "SPLIT-HIGHandSPLIT- LOW". Check resistance
between pins х4/7 (+) and х4/6 (-): On the side of the block FFR
Approximately 6 Kom, on the car side approximately 84.6 ohm. Check
resistance between pins х4/7 (+) and х1/3 (-): On the side of the block FFR
approx. 4.3 com, on the side of the car--

-. Check the voltage between the unit pins FFR {4/7 (+) and х4/6 (-): At an
activated electromagnetic valve approximately 27.6 v. At the deactivated
valve approximately 0 v.

898

Group of resistors limit
maximum speed.

Priority 5: Indication during stop and during vehicle movement. Signal Lamp
STOP is lit in yellow and during movement and during stop or parking.
Incorrect signal from the group of resistors (R134). Stage HGB (maximum
speed limit) remains activated. After the next turn, select the RGB0
(Maximum speed limit 1 is activated). With the help of PC check signal

accuracy, check wiring, pins in connectors, check the body interface х1996,

check the group of resistors (R134). Check the resistance between pins х2/6
(+) and х1/3 (-) on the side of the unit FFR Approximately 6.5 Kom, on the
side of the car approximately 0.511 Kom. Check resistance of the group of
resistors (R134): Between contacts 5 and 7/6 approximately 3.09 Kom,
between contacts 5 and 3/4 approximately 1.37 Kom, between contacts 5
and 2/8 approximately 0.51 Kom, between contacts 5 and 1/9 approximately

8.2 kom.
Check the voltage between the unit pins FFR: х2/6 (+) and х1/3 (-)
approximately 460 mv.

1045

The final stage of the
transmission lock.

Priority 5: Indication during stop and during vehicle movement. Signal Lamp
STOP is lit in yellow and during movement and during stop or parking.
Closure of the lock on the output of the transmission (end stage) of the
electromagnetic valve block (Y307). The transmission lock is no longer
controlled. Check with PC the actuators (lock on transmission), wiring, pins in
connectors. On gearboxes type ZF16S151/ZF16S181 Check the block of
electromagnetic valves (Y307). Check the resistance between the pins x 4/13
(+) and х3/5 (-): On the side of the unit FFR Approximately 8.9 ohm, on the
side of the car approximately 135 ohms. Check resistance between pins
х4/13 (+) and x 1/3 (-): On the side of the block FFR Approx. 8.3 Kom, on the
side of the car---. Check the voltage between pins х4/13 (+) and х3/5 (-):
When an electromagnetic valve is activated approximately 27.5 v., when The
solenoid valve is deactivated by approx. 0 v.

3010

Limit the speed and torque.

Priority 5: Indication during stop and during vehicle movement. Signal Lamp
STOP is lit in yellow and during movement and during stop or parking.
Incorrect signal from the group of resistors (R134). The limit level for the
speed range remains activated. At the first turn, step 0 is activated for the
engine speed range. With the help of PC check signal accuracy, check wiring,

pins in connectors, check the body interface х1996, check the group of

resistors (R134). Check the resistance between pins х2/1 (+) and х1/3 (-): On
the side of the block FFR Approximately 6.5 ohm, on the side of the car
approximately 0.511 ohms. Check resistance of the group of resistors (R134):
Between contacts 5 and 7/6 approximately 3.09 Kom, between contacts 5
and 3/4 approximately 1.37 Kom, between contacts 5 and 2/8 approximately

0.51 Kom, between contacts 5 and 1/9 approximately 8.2 kom. Check the
voltage between the unit pins FFR: х2/1 (+) and х1/3 (-) approximately 460
mv.