Section 08 ENGINE MANAGEMENT (4-TEC)
Subsection 03 (DIAGNOSTIC PROCEDURES)
When using the service action suggested in the
Fault section of B.U.D.S., the system circuits are
referred as 4-23 for instance. It means Amp con-
nector no. 4 and the circuit wire no. 23 as found
in the wiring diagram.
When they are referred as A-41, it means connec-
tor “A” ontheECMandthecircuit41.
Supplemental Information for
Some Specific Faults
Communication link fault code 1681: Sometimes
the information center does not synchronize fast
enough for the MPEM. That brings this fault code.
Simply clear the fault and try again.
ECM fault codes P0601, P0602, P0604 and P605:
These codes may occur in the following situations:
– Electrical noise is picked up by the ECM. En-
sure that all connections are in good condition,
also grounds (battery, ECM, engine and igni-
tion system), they are clean and well tightened
and that all electronic components are genuine
-- particularly in the ignition system. Installing
resistive caps, non-resistive spark plugs or im-
proper 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. It is not properly
programmed from the factory. The ECM must
be returned to be properly “activated”.
– If everything is in good condition, try a new
ECM.
Fault code P1202: See detailed information un-
der OSPS in subsection COMPONENT INSPEC-
TION AND ADJUSTMENT (4-TEC).
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.
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