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Diagnostic Manual, Climate Control, Volume 1

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LOCATION:    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).