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Climate Control

Diagnostic Manual, Climate Control, Volume 1

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3.1 Air Conditioning (A/C) > 26 Electrical Test Program - Test (Compressor Shut-Off)

Electrical Test Program - Test (Compressor Shut-Off)

	Test scope	Test connection			Test condition	Nominal value	Possible cause/Remedy
1.0	Engine systems control module (N16) Voltage supply	4	N16	21	Ignition: ON	> 10 V	Fuse B blown, Wiring.
2.0	A/C pushbutton control module (N22) Ground connection	3	N16	21	Ignition: ON Engage compressor by pressing	> 10 V	Wiring.
3.0	A/C compressor, electromagnetic clutch (A9k1)	21	N16	22	Engine: at Idle	Compressor must run	Wiring, A9k1.
4.0	A/C compressor, RPM sensor (A9l1)	21 5	N16	22 6	Engine: at Idle	0.25 V~	Wiring, 4.1 , A/C compressor (A9).
4.1	Resistance	5	A9l1	6	Disconnect engine systems control module (N16) from	530 - 900
5.0	RPM signal (TD or TN)	4	N16	16	Engine: at Idle	5.5 - 12 V	Wiring from DI control module (N1/3) to engine systems control module (N16).