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Code 1 - In-Car Sensor Error

Fig 1: Code 1 - In-Car Sensor Error Circuit Diagram
G04720093Courtesy of SUZUKI OF AMERICA CORP.

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

DIAGNOSTIC PROCEDURE

Step Action Value(s) Yes No
1
  1. Disconnect the in-car sensor connector from the ATC controller.
  2. Examine the wiring from the sensor to the connector and the connector for any signs of damage.
  3. Measure the resistance between the in-car sensor connector terminals.

Is there any sign of damage in the wiring or connector, or is the resistance outside the specified value at 20 - 25 °C (68 - 77 °F)?		 2,600 - 2,100 Ω Go to Step 2 Go to Step 3
2 Repair the damaged wiring or the connector, or replace the in-car sensor as required.
Is the repair complete?		 - System OK -
3
  1. Turn the ignition to ON.
  2. Measure the voltage between the 2 connector terminals on the controller housing.

Is the voltage equal to the value specified?		 > 4 V Go to Step 7 Go to Step 4
4 Check the terminals on the in-car sensor connector.
Is any problem found with the connector?		 - Go to Step 5 Go to Step 6
5 Repair the connector terminals or replace the in-car sensor or ATC controller as required.
Is the repair complete?		 - System OK -
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 1 condition?		 - Go to Step 7 System OK
7 Replace the ATC controller.
Is the repair complete?		 - System OK -
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