A6 Sedan V6-2.8L (AHA) (1998)
-
Disconnect 3-pin harness connector from Mass Air Flow sensor (MAF).
-
Connect multimeter US 1119 (Fluke 83 or equivalent) between harness connector terminals 2 (Ground) and 3 (B+), using adapter cables from VW
1594 connector test kit.
Specified value: 9.0-14.5 volts
If there is no voltage:
-
Switch ignition off.
-
Check wiring using applicable wiring diagram.
Checking wiring
-
Switch ignition off.
-
Connect VAG 1598/22 test box to ECM harness connector.Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting
VAG 1598/22 Test Box" See: Computers and Control Systems/Testing and Inspection
-
Check wiring for open circuits, between ECM/test box and 3-pin MAF sensor harness connector.
-
Connector terminal 1 to ECM/test box socket 13
-
Connector terminal 2 to ECM/test box socket 12
-
Specified value: max. 1.5 Ohms
-
Check wiring for short circuits between terminals of 3-pin connector, and between connector and ECM/test box.
-
Connector terminal 1 to ECM/test box socket 12
-
Specified value: Infinity Ohms
-
Switch multimeter to 20 VDC measuring range.
-
Check wiring at 3-pin connector for short circuit to B+ (battery positive voltage), according to applicable wiring diagram.
-
Connector terminal 1 to vehicle Ground
-
Connector terminal 2 to vehicle Ground
-
Specified value: 0 volts
If wiring is OK:
-
Replace Mass Air Flow sensor (MAF) -G70-.
-
Check readiness code.If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code.
Refer to "Moniters, Trips and/or Drive Cycle (Readiness Codes)/Checking Readiness Code" See: Computers and Control Systems/Testing and
Inspection
Refer to "Moniters, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code See: Computers and Control Systems/Testing and
Inspection