Operation CHARM
: Car repair manuals for everyone.
Home
>>
GMC
>>
1993
>>
S15/T15 2WD P/U L4-151 2.5L
>>
Repair and Diagnosis
>>
Powertrain Management
>>
Computers and Control Systems
>>
Overvoltage Protection Relay
>>
Description and Operation
Manuals through 2025 now available!
Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.
LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
lemon-manuals.la
or
lemon-manuals.org.ua
(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)
Or, hide this message:
temporarily
or
permanently
Overvoltage Protection Relay: Description and Operation
PURPOSE
Inform the ECM that there is a basic generator over voltage problem.
OPERATION
If voltage is greater than 17.1 volts for 5 seconds at ECM terminal "B1", sets Diagnostic Fault Code 53.