Engine Controls Schematic Icons
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Engine Controls Schematics
Schematic and Routing Diagram
CAUTION
!
The OBD II symbol is used on the circuit diagrams in order to alert the
technician that the circuit is essential for proper OBD II emission
control circuit operation. Any circuit which fails and causes the
malfunction indicator lamp (MIL) to turn ON, or causes emissions-
related component damage, is identified as an OBD II circuit.
NOTE
Twisted-pair wires provide an effective shield that helps protect
sensitive electronic components from electrical interference. If the
wires were covered with shielding, install new shielding.
In order to prevent electrical interference from degrading the
performance of the connected components, you must maintain the
proper specification when making any repairs to the twisted-pair wires
shown:
• The wires must be twisted a minimum of 9 turns per 31 cm (12 in) as
measured anywhere along the length of the wires
• The outside diameter of the twisted wires must not exceed 6.0 mm
(0.25 in)
Engine General Information and Diagnosis:
Icon Definition
1A-4