TROUBLESHOOTING PROCEDURE FOR DTC
Diagnostic trouble code
A/C RELAY-MALFUNCTION
Related items
(according to CC
code)
C018 Line: short circuit
Short circuit to battery line
A/C compressor relay defective
C019 Line: open circuit
Short circuit to ground line, open circuit
A/C compressor relay defective
Pressure switch defective
A/C compressor magnetic clutch
Step Inspection
1 IG ON.
Measure voltage at compressor relay (A/C comp.) pin 86 to GND.
If set value is not attained, check fuse.
2 Measure voltage at compressor relay (A/C comp.) pin 30 to GND.
If set value is not attained, check supply voltage.
3 Check wiring from compressor relay pin 87 to plug of compressor.
Check wiring between relay pin 85 to ECU pin 21.
Check wiring between pressure switch to ECU pin 51, pin 60.
Check A/C compressor magnetic clutch if proceeding tests do not reveal the cause of trouble.
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