PRE-RELEASE
A/C relay
| A/C relay |
When the A/C compressor is activated from ACC, DICE will send bus information "A/C ON" provided all other conditions are fulfilled. The value is used by ECM.
The control module then calculates the impending torque requirement of the compressor using the A/C pressure and then requests a corresponding increase in mm 3 /combustion. After a short delay, the control module will ground pin 38, which is connected to the A/C relay.
The control module activates the relay only when the engine has been started.
| Diagnostics |
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If there is an open circuit or short circuit to ground, diagnostic trouble code P0646 will be generated.
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If there is a short circuit to B+, diagnostic trouble code P0647 will be generated.
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System reaction to a fault
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AC relay disengages.
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| Note | ||
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The A/C request from DICE can be read with the diagnostic tool. |
