Corrosion is the enemy of many vehicle components and systems. Follow this SureTrack Real Fix to see how corrosion caused a no start condition on this 2002 Volvo S80 and how it was diagnosed.
Vehicle
2002 Volvo S80 T-6 2.9L
Title
Engine Does Not Start, Cleaned Powertrain Control Module Ground
Complaint
The customer states the engine will not start.
Cause
Confirmed the customer’s complaint and found the engine did not start. Used an inline spark tester on the spark plug cranked the engine and found spark was not present. Disconnected the connector for the coil on plug, used the multi-meter to measure the specified 12 Volt supply and less than 100mv ground while cranking the engine and found the less than 100mv ground pulse was not present. Key on, used the multi-meter to test the fuse for the powertrain control module and found voltage was present on both sides of the fuse. Accessed the connector for the powertrain control module, backprobed the ground terminals A53, A54 and A63 and found the grounds were not present. Visually inspected the main ground G96 at the right side engine compartment fender for the powertrain control module and the transmission control module and found no apparent faults. removed the bolt from the main ground G96 harness connector and found the wiring harness connector was corroded.
Correction
Cleaned the powertrain control module ground and verified the vehicle operated properly. The customer’s concern did not return.
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