P1760
Symptom: "CHECK ACS" warning lamp on. If engine load is absent, a minor decrease in comfort will result.
Engine load, signal wrong
Fault symptom
"CHECK ACS" warning lamp on. If engine load is absent, a minor decrease in comfort will result.
Condition
Engine load is a PWM signal from the TRIONIC system. The frequency is proportional to engine rpm. The input signal is absent or faulty.
Diagnostic procedure
1 Check the engine load signal
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Connect the Scan tool diagnostics instrument to the car's data link connector.
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Select the "ENGINE LOAD" command in the "READ FUNCTIONS" menu. The nominal value at idling speed is about 0%%.
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Open the throttle and note whether the value increases considerably.
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Is functionality OK?
Continue with point 2.
Repair or replace the lead in question and proceed to point 2.
2 Final check
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Clear the diagnostic trouble code.
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Perform a drive cycle by driving the car at varying engine rpm and loads for 5 minutes.
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Check whether the diagnostic trouble code has recurred.
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Has the diagnostic trouble code recurred?
Continue as described in the section "Before replacing a control module", see
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The steps taken to rectify the fault were correct.
