5.OFi, 5.8Fi, FSi
Keep alive power wire (KAPWR) connections
To eliminate the possibility of losing data gained by adaptive learning strategy, the keep
alive power wire (KAPWR) should be connected directly to the positive post of the starting
(number 1) battery or the starting battery side of the selector switch. Ensure the
grounding circuit remains connected (is not broken by a disconnect switch), to ensure a
complete circuit. While the loss of this data is in no way harmful, the re-acquisition of
this data can result in poor performance characteristics for up to ten minutes of the
running cycle whenever the power is disconnected. The power demanded by the (KAPWR)
circuit is not sufficient to discharge the battery.
If a battery switch is used, care must be given to operate the engine only when the switch
is in the "B1" or "BOTH" position. Operation with the switch in the
"B2" position will cause a voltage mismatch between the ECA and the alternator
output and result in poor performance. while these problems are temporary in nature,
operation in the "B2" position is not recommended.
CAUTION: Do not operate the engine with the switch in the "B2"position. Do not
install the (KAPWR) wire to the common terminal of the battery selector switch.
Wiring Harness Guidelines:
· Electromagnetic compatibility of components and interconnecting wiring is highly
sensitive to location within the vehicle.
· Low voltage/current signals are especially sensitive and the following guidelines must
be closely observed.
High Voltage Ignition Components:
· Sensitive component wiring must not be mounted/ routed any closer than 15 cm to a high
voltage component, e.g. spark plug wires.
· If unable to comply with this recommendation, a shielded (with the shield grounded at a
point beyond 15 cm) shall be used.
Starter Motor:
· Sensitive components and wiring must not be mounted/routed any closer than 25 cm to
starter
motor high current capacity cables. Alternator Output Wiring:
· Sensitive components and wiring must not be mounted any closer than 10 cm to alternator
output wiring.
General Guidelines:
· The EEC-IV subsystem must have its own wiring
harness to minimize interference.
· The (KAPWR) wire must be connected and right angles to the main battery feed when
connected
directly to the battery post (figure 2).
· Bundling of low level wiring and high current/voltage frequency wiring must be kept to
a minimum.
· If these requirements cannot be met, low level signal wiring must be twisted pairs of
10-12 twists per foot.
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