A4 Quattro Sedan L4-1.8L Turbo (AEB) (1998)
-
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: Powertrain Management/Computers and Control Systems/Testing and Inspection
-
Check wiring for open circuits between ECM/test box and 4-pin MAF sensor harness connector.
-
Connector terminal 2 to ECM/test box socket 12
-
Connector terminal 4 to ECM/test box socket 13
-
Specified value: max. 1.5 Ohms
-
Check wiring for short circuits between terminals of 4-pin connector, and between connector and ECM/test box.
-
Connector terminal 4 to ECM/test box socket 12
-
Specified value: Infinity Ohms
-
Switch multimeter to 20 VDC measuring range.
-
Check wiring at 4-pin connector for short circuit to B+ (battery positive voltage), according to applicable wiring diagram.
-
Connector terminal 2 to vehicle Ground
-
Connector terminal 4 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 "Monitors, Trips and/or Drive Cycle/Displaying Readiness Code" See: Powertrain Management/Computers and Control Systems/Testing
and Inspection
Refer to "Monitors, Trips and/or Drive Cycle/Generating Readiness Code" See: Powertrain Management/Computers and Control Systems/Testing
and Inspection