A8 Sedan V8-3.7L (AEW) (1997)
-
Connect multimeter US 1119 (Fluke 83 or equivalent) and measure resistance across of IAT sensor terminals.
Specified values (vs. sensor temperature):
-
At 0 °C: approx. 14.80 - 18.00 kohms
-
At 20 °C: approx. 5.60 - 6.80 kohms
-
At 40 °C: approx. 2.30 - 2.90 kohms
-
At 60 °C: approx. 1.00 - 1.40 kohms
If resistance values differ from specified values:
-
Replace IAT sensor -G42-.
-
Check readiness code. If DTC memory has been erased, generate new readiness code.
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Code)/Checking, Readiness Code" See: Computers and Control Systems/Testing and
Inspection
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Code)/Generating, Readiness Code" See: Computers and Control Systems/Testing and
Inspection
-
If resistance values are OK:
-
Check wiring between ECM as follows:
-
Connect VAG1598/19 test box to ECM harness connector. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/VAG1598/19
Test Box, Connecting" See: Computers and Control Systems/Testing and Inspection
-
Check wiring for open circuit or short circuit to B+ or Ground between 2-pin IAT sensor connector and ECM.
2-pin IAT sensor connector terminal
VAG1598/19 test box socket (ECM terminal)
1
A22
2
A19