P0643
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE lamp on.
Loss of performance.
Cruise control out of order.
Voltage Supply Group 1, Open/Short to B+
Fault symptoms
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Cruise control out of order.
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On-Board Diagnostics
Type of diagnosis:
Enable criteria:
Fault criteria:
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Control module output shorted to B+/open circuit.
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System reaction to a fault:
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Limp Home, torque limitation.
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Cruise control is switched off.
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Idling set to 1400 rpm.
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Check the wiring
A fault in the control module's female connector can generate a DTC. Check the contact for oxidation, dislodge pins and pin clamping force.
Jiggle the leads and in-line connectors at various points and in different directions to detect any intermittent breaks or short circuits in the wiring. Observe the multimeter, test lamp or diagnostic tool while doing this. Check switches, connectors and crimp connections for oxidation, dislodged pins and pin clamping force.
Diagnostic help
Diagnosis checks the power supply to:
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Camshaft position sensor
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Accelerator pedal position sensor
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For more information, see also:
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"Read Values" menu
for a description of read values.
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"Activate" menu
for a description of applications.
