Section 05 ENGINE MANAGEMENT
Subsection 03 (DIAGNOSTIC PROCEDURES)
4-TEC SYSTEM FAULT CODES
General
ThefaultsregisteredintheVCM/ECMECUare
kept when the battery is disconnected.
IMPORTANT: After a problem has been solved,
ensure to clear the fault(s) in the VCM/ECM ECU
using the VCK. This will properly reset the appro-
priate counter(s). This will also records that the
problem has been fixed in the VCM/ECM ECU
memory.
Many fault codes at the same time is likely to be
burnt fuse(s).
For more information pertaining to the code faults
(state, count, first, etc.) and report, refer to
B.U.D.S. online help.
Supplemental Information for
Some Specific Faults
ECM ECU fault codes P0601, P0602, P0604 and
P605: These codes may occur in the following
situations:
– Electrical noise is picked up by the ECM ECU.
Ensure that all connections are in good con-
dition, also grounds (battery, ECM ECU, en-
gine and ignition system), they are clean and
well tightened and that all electronic compo-
nents are genuine — particularly in the igni-
tion system. Installing resistive caps, non-re-
sistive spark plugs or improper knock sensor
wiring/routing may lead to generate this fault
code.
– Electrical noise might also lead engine to oc-
casional cutout without generating a fault code
when engine is restarted. When looking at the
fault code, pay attention to the “count” value in
the software B.U.D.S. A value between 1 and
9 confirms an electrical noise problem. A value
of 10 and above will generate a fault code.
– When installing a new ECM ECU. It is not prop-
erly programmed from the factory. The ECM
ECUmustbereturnedtobeproperly“acti-
vated”.
– Perform service action recommended in
B.U.D.S. under the “Faults” tab.
– If everything is in good condition, try a new
ECM ECU.
When using the service action suggested in the
Fault section of B.U.D.S., Refer to WIRING DIA-
GRAM to have the explanation of the system cir-
cuits coding that are referred to in B.U.D.S.
TPS (Throttle Position Sensor) Faults
Faults which are reported in B.U.D.S. fall into two
groups TPS faults and adaption faults. These are
displayed on the B.U.D.S. system as TPS OUT OF
RANGE and TPS ADAPTION FAILURE.
212 Te m plat e
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