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Code 2 - Ambient Air Temperature Sensor Error

WARNING: This page is about a different car, the 2006 Suzuki Verona. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Code 2 - Ambient Air Temperature Sensor Error Circuit Diagram
G04720094Courtesy of SUZUKI OF AMERICA CORP.

This code will set if the output of the ambient air temperature sensor indicates a probable short circuit or an open in the sensor or the associated wiring harness or a malfunction of the ATC controller.

STEP ACTION VALUE CHART

Step Action Value(s) Yes No
1
  1. Disconnect the ambient air sensor connector from the front bumper harness.
  2. Measure the resistance between the ambient air sensor connector terminals.

Is the resistance equal to the specified value at 20 - 25 °C (68 - 77 °F)?		 2,600 - 2,100 Ω Go to Step 5 Go to Step 2
2
  1. Remove the ambient air sensor from behind the front bumper.
  2. Examine the wiring for any open or short and examine the connector for any damage.

Is there a problem with the wiring or the connector?		 - Go to Step 3 Go to Step 4
3 Repair the problem found in the ambient air sensor wiring or the connector.
Is the repair complete?		 - System OK -
4 Replace the ambient air sensor.
Is the repair complete?		 - System OK -
5
  1. Turn the ignition to ON.
  2. Measure the voltage between the 2 terminals in the ambient air sensor connector on the front bumper harness.

Is the voltage equal to the value specified?		 > 4 V Go to Step 7 Go to Step 6
6
  1. Reconnect the in-car sensor to the controller.
  2. Turn the ignition switch to ON.
  3. Observe the temperature display area.

Does this display indicate the continuing presence of a code 2 condition?		 - Go to Step 8 System OK
7
  1. Pull the ATC controller from the instrument panel, leaving the wiring harness connected.
  2. Measure the voltage between terminals A13 and B8 by backprobing the connectors.

Is the voltage equal to the value specified?		 < 4 V Go to Step 8 Go to Step 9
8 Replace the ATC Controller.
Is the repair complete?		 - System OK -
9
  1. Trace the wiring for the ambient air sensor from the ATC controller, through connectors C217, C210, C103 and C101 at the engine fuse block, and C108 to the ambient air sensor connector on the front bumper harness.
  2. Repair any open or high resistance condition in the wiring or a connector terminal.

Is the repair complete?		 - System OK -
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