GM Troubleshooting Part 7 - Sensors and ascendancy valves (non EGR)

!: GM Troubleshooting Part 7 - Sensors and ascendancy valves (non EGR)

This is part 7of a multi part video series about how to troubleshoot any ignition, fuel injection or timing issue. I describe the sensors and how to troubleshoot them: Throttle Position Sensor (TPS), 2) Manifold Absolute Pressure (MAP), Intake Air Temperature (IAT), Engine Coolant Temperature (ECT), Engine Temperature sensor for the gauge in your dash, Knock Sensor (KS) TPS - dtc 21 or 22, variable resistor. checking wire harness grey(+) to black should show 5Vdc from ECM. From sensor, signal (dk blue wire) to common (blk wire) should show ~7Kohms at WOT and 1.9kohms @ throttle closed. Should be smooth resistance changes while adjusting TPS position. MAP - just disconnect it. if problem goes away replace the MAP IAT- 8kohms @-5 deg C, 2.2kohms @ 37 deg C, 5 VDC from ECM ECT - 177 ohms @ 100 degC, 2238ohms @ 30 degC, 3520 @ 20 deg C, 9420 ohms @ 0 degC, 21.4k ohms @ -15 deg C. When these fail, they fail with higher resistance, telling the ECM it is too cold which causes the ECM to richen the mixture. Note: there is a separate video for the EGR valve (part 6 in the series)

GM Troubleshooting Part 7 - Sensors and ascendancy valves (non EGR)

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