Question about 2002 Chevrolet Monte Carlo
HI, The DTC set PO102 is for your MAF (mass air flow) sensor. this sensors measures the air moving past it my heating a fine wire much like one inside a light bulb. Even cleaning these will not get the contaminates off. That little wire gets very hot and if dirt gets on it it will bake to it then this throws off its readings for your computer. If you checked and you have your 5 volt reference for this sensor the only other thing is to replace it. You can get re-manufactured one now at any major parts store. Good luck
Posted on Aug 28, 2010
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Posted on Jan 02, 2017
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Fig. Fig. 1: ALDL connector-1994 models
Listings of the trouble for the various engine control system covered in this guide are located in this section. Remember that a code only points to the faulty circuit NOT necessarily to a faulty component. Loose, damaged or corroded connections may contribute to a fault code on a circuit when the sensor or component is operating properly. Be sure that the components are faulty before replacing them, especially the expensive ones. The Assembly Line Diagnostic Link (ALDL) connector or Data Link Connector (DLC) may be located under the dash and sometimes covered with a plastic cover labeled DIAGNOSTIC CONNECTOR.
Fig. Fig. 1: Typical Manifold Absolute Pressure (MAP) sensor
wiring diagram (wire color, terminal identification/location may vary on
Fig. Fig. 2: Using jumper wires and a high impedance voltmeter
test between MAP sensor terminals A and C with the key ON and engine
off. The voltage should be approximately 5 volts
Fig. Fig. 3: Next test between MAP sensor terminals A and B with
the key ON and engine off. The voltage should be approximately 0.5 volts
Throttle position sensor test
TESTINGSee Figures 1, 2 and 3
Fig. Fig. 1: Common Throttle Position Sensor (TPS) wiring diagram
(wire color, terminal identification/location may vary on certain
Fig. Fig. 2: Using jumper wires and high impedance voltmeter, test
between the sensor ground and reference terminals, the voltage should
be approximately 5 volts
Fig. Fig. 3: Next test between the sensor signal and ground
terminals, verify that the TPS voltage increases or decreases smoothly
as the throttle is opened or closed
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