Question about 1994 Geo Metro
Posted by Anonymous on
Wont go to high idle
this is the IAC failing not TPS, the tps only signals to the ECU
that you are at idle.
Posted on Sep 15, 2014
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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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Fig. Fig. 3: Location of the MAP sensor-TBI system shown
Fig. Fig. 4: Probe the terminals of the MAP sensor to check for proper reference voltage
Fig. Fig. 5: Manifold Absolute Pressure (MAP) sensor wiring diagram
TPS TESTINGSee Figures 2, 3 and 4
Fig. Fig. 2: Using a DVOM, backprobe terminals A and B of the TPS sensor to check for proper reference voltage
Fig. Fig. 3: Using the DVOM, backprobe terminals C and B of the
TPS sensor, open and close the throttle and make sure the voltage
Fig. Fig. 4: Throttle Position Sensor (TPS) wiring diagram
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