P0686
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE lamp on.
Engine turns off.
Engine fails to start.
Main Relay Circuit. No Voltage to Control Module
Fault symptoms
On-Board Diagnostics
Type of diagnosis:
Enable criteria:
Fault criteria:
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The many relay has been switched off too early.
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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
Functions in the diagnostic tool related to the fault:
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.
