LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2006 >> Verona Base >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning System >> Automatic >> Diagnostic Information and Procedures >> Code 3 - Coolant Temperature Sensor Error
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Code 3 - Coolant Temperature Sensor Error

Fig 1: Code 3 - Coolant Temperature Sensor Error Circuit Diagram
G04720095Courtesy of SUZUKI OF AMERICA CORP.

This code will set if the output of the coolant 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 coolant temperature sensor connector from the ATC harness.
  2. Examine the wiring from the sensor to the connector and examine the connector for any signs of damage.
  3. Measure the resistance between the coolant temperature sensor connector terminals.

Is there any sign of damage in the wiring or the 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 coolant temperature sensor as required.
Is the repair complete?		 - System OK -
3
  1. Turn the ignition to ON.
  2. Measure the voltage between the 2 coolant temperature sensor connector terminals on the ATC harness.

Is the voltage equal to the specified value?		 < 4 V Go to Step 7 Go to Step 4
4 Check the terminals on the coolant temperature sensor connector.
Is any problem found with the connector?		 - Go to Step 5 Go to Step 6
5 Repair the connector terminals, replace the coolant temperature sensor or ATC controller as required.
Is the repair complete?		 - System OK -
6
  1. Reconnect the coolant temperature sensor to the ATC harness.
  2. Turn the ignition switch to ON.
  3. Observe the temperature display area.

Does this display indicate the continuing presence of a code 3 condition?		 - Go to Step 9 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 B9 by backprobing the connectors.

Is the voltage equal to the value specified?		 < 4 V Go to Step 9 Go to Step 8
8
  1. Trace the wiring from controller terminals A13 and B9 to the coolant temperature sensor connector terminals on the ATC harness connectors.
  2. Repair any open, high resistance found in the wiring or connector terminals.

Is the repair complete?		 - System OK -
9 Replace the ATC controller.
Is the repair complete?		 - System OK -
scientia non olet · About LEMON Manuals