Generac Power Systems GP Series Diagnostic And Repair Manual

Section 3 Troubleshooting Flowcharts
34 Diagnostic Repair Manual
Problem 11 – Engine Overspeeds
Problem 12 – Idle Control “RPM Does Not Decrease”
Problem 13 – Idle Control “RPM Does Not Increase When Load Is Applied”
Problem 14 - Engine “Hunts” / Erratic Idle
TEST 1 - CHECK
NO-LOAD
VOLTAGE &
FREQUENCY
TEST 51 - CHECK
WIRES 11S & 44S
OR
WIRES 11S & 22S
TEST 5 - CHECK
STEPPER MOTOR
OPERATION
GO TO PROBLEM 2
REPAIR OR REPLACE
PRODUCING
VOLTAGE
NO
VOLTAGE
BAD
BAD
GOOD
GOOD
REPLACE
CIRCUIT
BOARD
REPAIR OR REPLACE
GOOD
BAD
TEST 52 - CHECK
IDLE CONTROL
SWITCH
REPLACE
BAD
REPLACE PRINTED
CIRCUIT BOARD
VERIFY THAT
THERE IS NO LOAD
ON THE
GENERATOR
GOOD
TEST 53 - CHECK
IDLE CONTROL
WIRING
GOOD
BAD
TEST 54 - CHECK
IDLE CONTROL
TRANSFORMERS
(ICT)
REPLACE
BAD
REPAIR OR REPLACE
REPLACE
PRINTED
CIRCUIT BOARD
VERIFY THAT WIRE 11 &
WIRE 44 ARE ROUTED
THROUGH IDLE CONTROL
TRANSFORMERS (ICT)
ROUTE THROUGH IDLE
CONTROL TRANSFORMERS
AND RE-TEST
GOOD
GOOD
TEST 55 - CHECK
TR1 & TR2
WIRING
BAD
ADJUST OR REPLACE
BAD
BAD
REPLACE
REPAIR
OR
REPLACE
GOOD
GOOD
BAD
BAD - ENGINE MISS
APPARENT
GOOD
TEST 56 - CHOKE
TEST
TEST 29 - CHECK
SPARK
TEST 30 - CHECK
SPARK PLUG
TEST 35 - CHECK /
ADJUST IGNITION
MAGNETOS
ADJUST / RE-TEST
TEST 40 - CHECK /
ADJUST VALVES
REPLACE
PRINTED
CIRCUIT BOARD
NO
SURGING
STILL
SURGING
TEST 5 - CHECK
STEPPER MOTOR
OPERATION
TEST 39 - CHECK
CARBURETION
GOOD

Generac Power Systems GP Series Specifications

General

Brand	Generac Power Systems
Model	GP Series
Category	Portable Generator
Language	English