Engine Controls Schematic Icons. Chevrolet Astro

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2002 🢒 Astro - 2WD 🢒 Engine 🢒 Engine Controls - 4.3L 🢒 Engine Controls Schematic Icons

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Refer to

Notice: 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.

in Cautions and Notices.

Important: Twisted-pair wires provide an effective shield that helps protect sensitive electronic components from electrical interference. Depending on application, twisted-pair wires are used on wiring harnesses connecting the following components:

•	The electronic ignition control module

•	The manifold absolute pressure (MAP) sensor

•	The powertrain control module (PCM)

•	The vehicle speed sensor (VSS)

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 30.5 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 (0.236 in).

Refer to Splicing Twisted or Shielded Cable in Wiring Systems.