Check reference values between ECM terminals and ground under the following conditions:
ECM TERMINAL
NO.
ITEM CONDITION
DATA (AVERAGE
DC VOLTAGE)
69 Air compressor relay
• Ignition switch ON or after engine is
started.
• If IAT is above 140.3°C, A/C will be shut
off.
• If ECT is above 140.3°C, A/C will be shut
off. If ECT is below 111.8°C, A/C will be
resume.
• If engine speed is above 6520 RPM or
below 520 RPM, A/C will be shut off.
• If A/C high pressure is above 20 bar, A/C
will be shut off. If A/C high pressure is
below 19.5 bar, A/C will be resume.
• If evaporator temperature is below 1.5°C,
A/C will be shut off. If evaporator
temperature is above 4.5°C, A/C will be
resume.
• If system voltage is below 8.04 V, A/C will
be shut off. If evaporator temperature is
above 10.01 V, A/C will be resume.
0 V or 12 V
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO. DTC DEFINITION
DTC DETECTION
CONDITION
DTC SET
CONDITION
POSSIBLE CAUSE
P0645
A/C clutch relay
circuit
Engine is running
ECM detected that
the input signal is
out of the
acceptable range.
• Fuse
• A/C compressor
relay
• Harness or
connectors
• ECM
DTC Confirmation Procedure:
Before performing the following procedure, confirm that battery voltage is more than 12 V.
• Turn ignition switch off.
• Connect the X-431 scan tool to the Data Link Connector (DLC) - use the most current software available.
• Turn ignition switch on.
• With the scan tool, record and erase stored DTCs in the ECM.
• Start the engine and warm it to normal operating temperature.
• With the scan tool, select view DTCs in the ECM.
• If the DTC is detected, the condition is current. Go to Diagnostic Procedure - Step 1.
• If the DTC is not detected, the DTC condition is intermittent (See Diagnostic Help and Intermittent DTC Trou-
bleshooting in Section 03 Electronic Engine Controls for more information).
NOTE :
While performing electrical diagnosis & testing, always refer to the electrical schematics for specific circuit
and component information.
DIAGNOSIS & TESTING
03–152
Chery Automobile Co., Ltd.
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