2002 Impala 3.4 MAF sensor ground location
May 23rd, 2017, 7:10 PM
#1
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2002 Impala 3.4 MAF sensor ground location
I replaced the engine and transmission mounts (along with struts and lower control arms) in a 2002 Impala 3.4 . My car now throws P0102 MAF low voltage DTC .
I'm a believer in "Where was the human last?" since the car ran fine before I did this so I suspect I disconnected a ground plug or wire . Where are the ground points and connections in the engine compartment located ?
I'm a believer in "Where was the human last?" since the car ran fine before I did this so I suspect I disconnected a ground plug or wire . Where are the ground points and connections in the engine compartment located ?
May 24th, 2017, 10:44 AM
#2
the sensor grds on a transaxle stud g113 near the starter. it shares this grd with the engine oil level sensor. I would unplug the maf sensor. the black wire is grd. test the wire by with a test light connected to power...if the grd is good, the test light should illuminate. test the maf reference voltage and signal wire ; but with a dvom. It should have battery voltage on the pink wire with key on. the signal wire is applied 4.5 volts from the pcm. if the voltage is 0v...you have a shorted to grd or bad pcm.
another way to test the pcm and wiring is to unplug the sensor....this should set a maf high dtc
check the maf wires voltages... you should get 12v, 4.5 volts and 0 volts
jumper the signal wire to grd...this should set a maf low dtc
if you get all this, the wiring and pcm are good, the sensor is bad.
another way to test the pcm and wiring is to unplug the sensor....this should set a maf high dtc
check the maf wires voltages... you should get 12v, 4.5 volts and 0 volts
jumper the signal wire to grd...this should set a maf low dtc
if you get all this, the wiring and pcm are good, the sensor is bad.