Question about 2002 Pontiac Montana
WHere can i get wiring schematic for map sensor?
Tips for a great answer:
May 20, 2018 | GMC Cars & Trucks
Jan 27, 2017 | 2005 Pontiac Montana
Jul 08, 2014 | 2001 Pontiac Sunfire
Mar 31, 2014 | 2002 Jeep Grand Cherokee
Feb 26, 2014 | 2006 Pontiac Montana SV6
Dec 13, 2011 | 2006 Pontiac Torrent
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.
Sep 05, 2011 | 2001 Ford Focus
Jun 17, 2011 | 1995 Cadillac DeVille
Apr 05, 2011 | 2003 Chrysler PT Cruiser
Jul 09, 2010 | 2002 GMC Envoy
60 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: