Question about Chevrolet TrailBlazer
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Posted on Jan 02, 2017
all your sensors run off the 5 volt ref. so you will have to trace your wiring harness from the pcm\ecm all the way out under the hood to locate the broken or pinched wire.
Posted on Feb 26, 2010
SOURCE: 2001 PT Cruiser DTC 340
Check over the wiring pretty close going to the sensor. Its on the left end of the head just under the valve cover. It has a 3 wire electrical connector, the sensor is bolted to the head with 2 10mm bolts. Look over the wiring for any rub spots around sharp edges, etc.
You might want to check the timing of the timing belt and the crankshaft position sensor as well, these can cause the code also.
However, more than often it is due to failure of camshaft position sensor.
Let me know,if needed further assistance.
Hope i helped you.
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Posted on Jul 06, 2011
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First, using your scan tool with the Key on and engine running, monitor the MAP Sensor voltage. If it is reading less than 5 volts, turn engine off, unplug the MAP sensor and, using a DVOM (Digital Volt/Ohm Meter) check for 5Volts on the 5 Volt reference circuit.
1. If there is not 5 Volts on the reference circuit, then check for the reference voltage at the PCM connector. If it is present at the PCM connector but not the MAP connector, repair the open in the wiring loom between the PCM and MAP harness connector.
If 5 Volt reference is NOT present at the PCM connector, check powers and grounds of PCM and repair/replace as needed.
2. If you have a 5 Volt reference at the MAP connector, jumper the 5 volt reference circuit to the signal circuit. Now check the MAP voltage on the scan tool. It should be 4.5 to 5 Volts. If it is, replace MAP sensor. If not, repair open/short in the signal circuit wiring and re-check.
3. If all appears okay, perform a wiggle test. Start engine and manipulate the harness, connector and tap on the MAP sensor. Note any changes in voltage or engine speed. Repair connector, harness, or sensor as needed.
4. If the wiggle test checks out, use a vacuum pump (or just use your lungs) to draw a vacuum on the MAP sensor vacuum port. As you add vacuum the voltage should decrease. With no vacuum, the MAP sensor should read approximately 4.5 volts. If there is no change in MAP sensor reading on the scan tool, replace MAP sensor.
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