ANTI-LOCK BRAKING SYSTEM
Diagnostic - Fault finding chart
38C
38C - 63V2 MR-372-J84-38C000$924_eng.mif
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0F
ABS8.0_V0C_ALP13 /ABS8.0_V0D_ALP13/ABS8.0_V0E_ALP13/ABS8.0_V0F_ALP13
ALP 13Intermittent illumination of the brake, ABS, SERVICE and STOP
fault warning lights and the message “brake failure” on the
instrument panel with no fault codes in the computer
NOTESOnly consult this customer complaint after a complete check with the diagnostic
tool.
Check the condition and connection of the
battery terminals.
Is the battery in good condition?
YES
Check the 50A power fuse in position 5 on
the power fuse board. Check fuse F13 (25A)
on the UPC and the correct locking of the
grey 4-track PPH1 connector (Vdiag 44) or
the 25A fuse F8 on the UPC and the correct
locking of the black 6-track CM connector
(Vdiag 48 or higher).
Are the fuses and connectors correct?
YES
Check the connection and condition of the tab
1 red wire of the grey connector.
Is the connector correct?
YES
NOClean the battery terminals.
NOIf the connector is faulty and there is a repair
procedure (see Technical Note 6015A,
Electrical wiring repair, Wiring: Precautions
for repair), repair the connector, otherwise
replace the wiring.
Replace any faulty fuses. Switch on the ignition
again.
Is the replaced fuse or fuses correct?
NO
Check the insulation to earth between:
–fuse 50A and track 2 of the computer
–fuse 25A and track 3 of the computer
Are the connections correct?
NO YES
Contact the Techline.
If the connection(s) are faulty and there is a repair method
(see Technical Note 6015A, Repairing electrical wiring,
Wiring: Precautions for repair), repair the wiring, otherwise
replace it.
NO
If the connector is faulty and there is a repair method (see Technical
Note 6015A, Repairing electrical wiring, Wiring: Precautions for repair),
repair the connector, otherwise replace the wiring.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
ANTI-LOCK BRAKING SYSTEM
Diagnostic - Fault finding chart
38C
38C - 64V2 MR-372-J84-38C000$924_eng.mif
ALP 13
CONTINUED
Check the connections on the 26-track
connector of the ABS computer.
Is the connector correct?
YES
Check the ABS earths on tracks 1 and 4
(attached under the ABS unit) and carry out
an inspection of the entire
ABS wiring.
Are the earths correct?
YES
Check the continuity between the fuses and
tracks 2 and 3 of the computer connector
(+ Before ignition present on the tracks) and
between the UCH and track 18 of the
computer (+ After ignition feed present on
the track).
Is the continuity correct?
YES
If the customer complaint is still present,
contact Techline.
NOIf the connector is faulty and there is a repair
procedure (see Technical Note 6015A,
Electrical wiring repair, Wiring: Precautions
for repair), repair the connector, otherwise
replace the wiring.
NOIf the connection(s) are faulty and there is a
repair method (see Technical Note 6015A,
Repairing electrical wiring, Wiring:
Precautions for repair), repair the wiring,
otherwise replace it.
BOSCH ABS 8.0
Vdiag No.: 0C, 0D, 0E, 0F
ABS 8.0X84 3.0
NOIf the connection(s) are faulty and there is a
repair method (see Technical Note 6015A,
Repairing electrical wiring, W iring:
Precautions for repair), repair the wiring,
otherwise replace it.
AFTER REPAIRClear the computer fault memory.
Carry out a road test followed by another check with the diagnostic tool.
