ad2620w3003a

Electronic power shift (EPS) diagnosis operational check without tester on display

Type ad · topic 26.20 · version 0100 · 2003-06-10

Applies to: TRANSMISSION 714.4 in MODEL 650.###, 651.###, 652.###, 653.###, 654.### ## up to 957416 TRANSMISSION 714.7, 715.2 in MODEL 625.1, 655.###, 656.###, 657.###, 658.###, 659.### ## up to 962862 TRANSMISSION 714.7 in MODEL 625.2

Where it sits

Function group 2 Chassis › 26 Manual transmission › 26.20 Electronic Power Shift (EPS) - Gear Control (GS) — Series 625 (models 1**, 2**) · Series 650 · Series 651 · Series 652 · Series 653 · Series 654 · Series 655 · Series 656 · Series 657 · Series 658 · Series 659

Also applies to engines/gearboxes: 714 4**, 714 7**, 715 2**

AD26.20-W-3003A

Electronic power shift (EPS) diagnosis operational check without tester on display

7.11.97

TRANSMISSION 714.4 in MODEL 650.###, 651.###, 652.###, 653.###, 654.### ## up to 957416

TRANSMISSION 714.7, 715.2
in MODEL 625.1,
655.###, 656.###, 657.###, 658.###, 659.### ## up to 962862

TRANSMISSION 714.7 in MODEL 625.2

Electronic power shift (EPS) diagnosis operational check without tester on display

W26.20-0022-01

The function check permits a limitation of the fault possibilities and should, as a basic principle, be carried out before operations on the EPS system. Faults are shown by the illumination of the display (1) and code numbers (2) in the display.

The connection of secondary electric consumers to the existing EPS fuses may, in the event of short-circuit or overloading, leave the EPS inoperative.

Electronic power shift (EPS), diagnosis previous knowledge

AD26.20-W-2001A

Diagnosis tools EPS

AD26.20-W-2001-01A

On-board voltage 24V (Specific density 1.16, with undervoltage fault code 17)

Indicator lamp for secondary consumers must be out

Compressed air minimum 5.5 bar

Function check

Test step / scope of test

Actuation / requirement

Specified value

Possible cause / remedy

1

Display function

Ignition: ON

All figures / symbols illuminate

approx. 4 s.

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AD26.20-W-6001-21A

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Fuse F1 on base module defective

2

Check warning buzzer function and D+ actuation

Ignition: ON

Start engine

Charge indicator lamp goes out

AD26.20-W-6001-19A

AD26.20-W-6001-20A

AD26.20-W-6001-21A

AD26.20-W-6001-22A

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3

Shift processes

Ignition: ON

Actuate clutch pedal

Shift through gears N, 1-8, R, reverse gear with function knob.

Actuate splitter switch.

All gears (N, 1-8, R, Split) are displayed according to actuation.

Actuate transmission tooth on tooth (actuate clutch pedal again if necessary / briefly start engine and repeat test step).

Check compressed air supply and test step 4.

4

Check whether fault code no. appears in display

– The fault codes no. 1-18 show stored electrical faults

– Faults occurring intermittently (loose contact) are also only displayed intermittently during driving.

– The fault lamp lights up in conjunction with fault codes no. 1-18.

Ignition: ON

Note illuminating code nos. as these may be erased after the following programming.

Carry out programming in the following sequence:

1. Switch off all electric consumers.

2. Switch off ignition (for at least 15 s).

3. Actuate clutch pedal and hold.

4. Hold shift lever in neutral position.

5. Switch on ignition.

The programming process lasts approx. 15 seconds.

The following codes may appear in the display during programming:

1a Fault codes 21-26 appear in display only during programming.

1b Previously displayed (noted) fault codes no. 1-18 do not appear in display during programming.

Fault is constantly present.

In the sequence:

1. Remove all previously displayed fault codes 1-18

AD26.20-W-6001A

and then carry out programming.

2. Check electrical and pneumatic connections on transmission for correct connection.

3. Mechanical defect in transmission.

The fault code no is shown again in the display after switching off engine and switching on ignition again.

Fault codes no. 21-26 show deviations from the sensor specified travel values during programming.

– When installing a new control unit, part no. 006 545 6632 or 006 545 6732, only 8 and N are displayed when programming.

– The driver or customer should also be informed about the programming process.

– Re-program in the event of undervoltage or jump-starting. With undervoltage programming should take place with jump-starting batteries.

2. New fault codes no. 21-26 appear in display.

Fault codes no. 1-18 do not appear in display.

In the sequence:

1. Check electrical and pneumatic connections on transmission for correct connection.

2. Sensor outside travel tolerance (replace on trial), refer to

AD26.20-W-2001-15A

(fault code assignment table).

3. Mechanical defect in transmission

3. If programming has not taken place:

Previously displayed (noted) fault codes no. 1-18 re-appear in display

Fault is constantly present. Carry out test steps in accordance with fault code no. displayed:

AD26.20-W-6001A

4. Previously displayed (noted) fault codes no. 1-18 no longer appear in display.

N. Neutral position is shifted / displayed following programming.

Fault is currently not present. Check components and plug connections in accordance with displayed fault code no. for correct functioning / loose contact:

AD26.20-W-6001A

5. Before and after programming no display in display, yet complaint on transmission.

1. Check electrical and pneumatic connections on transmission for correct connection.

2. Mechanical defect in transmission.

3. Possibly change control electronics on trial.

Referenced documents