Guardian 4389 Repair Manual page 93

DC CONTROL
TEST 51 - CHECK
GOOD
FUEL SUPPLY
AND PRESSURE
BAD
FIND AND CORRECT
CAUSE OF NO FUEL OR
LOW PRESSURE
TEST 55 - CHECK
GOOD
FOR IGNITION
SPARK
BAD
TEST 58 - CHECK
GOOD
SHUTDOWN WIRE
BAD
REPAIR OR
REPLACE SHORTED
WIRE 18 OR
CIRCUIT BOARD
PART 4
Problem 10 - Engine Cranks but Won't Start
TEST 53 - CHECK
CIRCUIT BOARD
WIRE 14 OUTPUT
BAD
REPLACE CIRCUIT BOARD
TEST 56 - CHECK
GOOD
SPARK PLUGS
BAD
CLEAN, REGAP
OR REPLACE
FLYWHEEL KEY
TEST 59 - CHECK
AND ADJUST
IGNITION MAGNETOS
BAD
ADJUST OR
REPLACE
TROUBLESHOOTING FLOW CHARTS
TEST 52 - CHECK FUEL SOLENOID
GOOD
(UNITS EQUIPPED WITH IDLE PORT
OF FUEL REGULATOR)
TEST 54 - CHECK FUEL SOLENOID
REPLACE FUEL SOLENOID
TEST 62 -
GOOD
CHECK AND
ADJUST VALVES
BAD
READJUST
CHECK
GOOD
TEST 59
REFER TO ENGINE
SERVICE MANUAL
SECTION 4.3
BAD
TEST 57 - CHECK
ENGINE
COMPRESSION
BAD
GOOD
TEST 63 - CHECK
FUEL REGULATOR
BAD
REPAIR OR
REPLACE
Page 91