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HOMESERVICE MANUALSCHEVROLET1995ASTRO VAN CARGO, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 4.3LTROUBLE CODE CHARTSCODE 23, INTAKE AIR TEMP. LOW - "L", "M", "S" & "T" SERIESDIAGNOSTIC AIDS
1995 Chevrolet Astro Van Cargo, RWD

Diagnostic Aids

1995 Chevrolet Astro Van Cargo, RWDSECTION Diagnostic Aids

If engine is allowed to cool overnight, coolant and MAT sensors should read close to each other, when measured with a scan tester. A Code 23 will also result if signal and ground circuits become open.

CODE 23 TERMINAL & CIRCUIT WIRING IDENTIFICATION

Application PCM Terminal Wire Color
"L" & "M" Series
4.3L
IAT Sensor Signal B9 Tan
IAT Sensor Ground B4 Purple
"S" & "T" Series
4.3L (VIN W) CPI
IAT Sensor Signal B9 Tan
IAT Sensor Ground B4 Black
TEMPERATURE-TO-RESISTANCE VALUES (1)(2)

°F (°C) Ohms
210 (100) 185
160 (70) 450
100 (38) 1800
70 (20) 3400
40 (4) 7500
20 (-7) 13,500
0 (-18) 25,000
-40 (-40) 100,700
(1) Measure resistance across sensor terminals.
(2) Temperatures are approximates.
Fig 1: Code 23 Schematic ("L", "M", "S" & "T" Series - 4.3L) Intake Air Temperature Low
G91E07386
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.