Automatic Air Conditioning System

AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): 14: Engine Coolant Temperature Communication Circuit

DTC 14 - Engine Coolant Temperature Communication Circuit

DESCRIPTION

The sensor connected to the ECM detects the engine coolant temperature that is used for warm up control when the engine is cold. The sensor sends a signal to the A/C amplifier via the ECM.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. DIAGNOSTIC TROUBLE CODE CHECK
(a) Check for DTC P0115 or P0117 or P0118 is output.
Result:





B -- CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - ECM)
A -- GO TO ENGINE CONTROL SYSTEM
2. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - ECM)
(a) Disconnect the connectors from the ECM and the A/C amplifier.





(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





*1: 3MZ-FE
*2: 2AZ-FE
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE AIR CONDITIONING AMPLIFIER