CS35 2013.04
3.1.13-221 3.1.13-221Electronic Control System - ME7
DTC P0645, P0647
1. DTC Description
2. Possible Sources
3. Diagnosis Procedures
Refer to: A/C Compressor Not Work Diagnosis (4.1.1 Heating, Ventilation and Air Condition-
ing, Symptom Diagnosis and Testing).
Fault Code Description Definition
P0645
A/C compressor relay control
circuit open circuit
A/C compressor relay operating power is supplied
by the main relay that under the control of ECM
ECM controls the internal grounding of A/C com-
pressor relay through terminal 69 of ECM wiring
harness connector E01, and the relay pickup.
There is a drive circuit control relay coil equipped
within the ECM for grounding. Drive circuit provides
a feedback circuit to ECM, ECM determines the con-
trol circuit open, short circuit to ground or power
through monitoring the feedback voltage.
P0647
A/C compressor relay control
circuit voltage is too high
Fault
Code
Test Tactics
Setting Conditions (Control
Strategy)
Fault
P0645
Hardware circuit
inspection
Open circuit
•A/C relay
• Circuit
•ECM
P0647 Short circuit to power supply
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