Question about Holden Cars & Trucks
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR (VOLTAGE HIGH-LOW VACUUM) You have a vacuum system leak mate. Go over the schematic under the bonnet and check each one carefully. Then check the air filter box and it's hose pipe for cracks. You have unmetered air entering into the mass flow sensor. No worries... Go Pies!
Posted on Apr 17, 2015
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Posted on Jan 02, 2017
your check engine lamp is probably on because the vehicles computer is not receiving a vehicle speed signal, because your speedo is not working. You need to check the sensor on the gearbox and the head unit in the dash cluster. The gearbox sensor has three wires, one is power to the sensor and should read 12volts with ignition on (but engine off), a second wire is the earth for the sensor and should read 0volts and the third is the signal wire which can read anything from 5 to 12 volts. This signal should jump between zero volts and the signal voltage (5 to 12 volts) when the gearbox is rotated by turning a rear wheel (with the other wheels chocked to prevent the vehicle moving..and rotate the wheel by hand as some of these vehicles have a limited slip differential which can cause serious accidents if you try this with the engine turning the wheels...so don't). If the sensor is not getting 12 volts, check fuses and harness connections, if the signal voltage is missing check the head unit as this comes from the head unit to the sensor. If the signal voltage does not fluctuate when the wheels are rotated, or stays at zero volts, suspect the sensor.
Posted on Dec 19, 2009
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