3) Cylinder Head Temperature Sensor
If you are experiencing any irregular performance as the engine temperature changes, inspect the
connections on the cylinder head temperature sensor. We routinely see monitor logs with a poor
connection or a faulty sensor which will send erroneous data to the AutoTune system. This condition
can easily be identified by recording a monitor log during the operation of the engine. Normal operation
would show a steady gradual engine temperature changes as the engine warms up.
We recommend that all ECM related wiring connectors, system relays and ECM fuses are inspected
and cleaned by swabbing with alcohol and Q-Tip to remove scale and oxidation build-up. Then, apply a
light coat of dielectric grease on the connector before reconnecting.
This will improve conductivity by preventing future corrosion or scale from forming.
It is highly recommended to do the same for the fuse box and all fuse spades.
Replace severely corroded parts
3. Service the Battery
Often overlooked or assumed in good order, yet roughly 50% of the vehicle we see at Rallies have
loose battery cables or improper mounting of ancillary connectors on the battery which will give you
problems.
A) REMOVE ECM FUSE then the battery cables; clean and prepare them before re-installation.
