Chery Tiggo. Manual — part 121
P0645 - A/C Clutch Relay Circuit
DIAGNOSIS & TESTING
LTSMW030065T
03
DIAGNOSIS & TESTING
LTSMW030066T
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
• After engine has been
started for 5 seconds, A/C
can be turned on.
• 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 resume.
• If A/C high side
pressure is above 20.0
bar, A/C will be shut off. If
A/C high side pressure is
below 19.5 bar, A/C will
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
resume.
• If system voltage is
below 8.04 V, A/C will be
shut off. If system voltage
is above 10.01 V, A/C will
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 engine and warm it up to the normal operating temperature.
• Turn A/C switch on then select view DTC.
• If DTC is detected, go to Diagnostic Procedure - Step 1.
• If the DTC is not detected, the DTC condition is intermittent (See Diagnosis & Testing Diagnostic Help in Sec-
tion 03 Electronic Engine Controls).
NOTE :
While performing electrical diagnosis & testing, always refer to the electrical schematics for specific circuit
and component information.
DIAGNOSIS & TESTING
03
Diagnostic Procedure
1.
CHECK GROUND CONNECTIONS
• Turn ignition switch off.
• Loosen and retighten ground screws on the body (See Ground Inspection in Section 03 Electronic Engine Con-
trols).
• Inspect ground connections E-207 and E-208 mounting position (See Vehicle Wiring Harness Layout - Engine
Room Harness (With 1.6L/1.8L Engine) in Section 16 Wiring).
Are the ground connections OK?
Yes
>>
Go to the next step.
No
>>
Repair or replace ground connections.
2.
CHECK A/C CLUTCH RELAY CONTROL CIRCUIT
• Turn off A/C switch.
• Check A/C clutch relay control circuit supply voltage
between ECM terminal 69 and ground in the ECM
electrical connector E-001.
• Battery voltage should exist.
Is the check result normal?
Yes
>>
Go to step 4.
No
>>
Go to the next step.
3.
DETECT MALFUNCTIONING PART
• Check the following:
− Fuse FB18, SB2
− Front fuse and relay box K, E, J
− A/C compressor relay, EMS relay (R2)
− Check harness for an open or short between ECM terminal 69 and fuse 12.
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Repair or replace malfunctioning part.
DIAGNOSIS & TESTING
LTSMD030065
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