ELECTRIC FUEL PUMP CONTROL SYSTEM (4WD models) - Inspection (Electric Check / Input Signal Check)
EF & EC-180spec tableElectric fuel pump control system applies to 4WD models (GA13DS/GA14DS/GA16DS).
Inspection
ELECTRIC CHECK
- 1Crank or start engine.
- 2Check voltage between terminal 3 and ground. Voltage: Battery voltage should exist. If N.G., check the following: 1) Input signal to control unit; 2) Electric fuel pump control unit; 3) Circuit continuityVoltage: Battery voltage should exist.
INPUT SIGNAL CHECK
Check input signals in each terminal of fuel pump control unit, following the table shown below. If N.G., check harness continuity between fuel pump control unit and each component, or check each component individually. If O.K., perform fuel pump control unit check.
Input Signal Check
Ground
Check terminals (+)6
Negative lead (-)Body earth
Condition—
Circuit tester RangeΩ
Circuit tester Reading0Ω
Battery (ON or START)
Check terminals (+)2
Negative lead (-)Body earth
ConditionIgnition switch "ON"
Circuit tester RangeV
Circuit tester ReadingBattery voltage
Battery (ON or START)
Check terminals (+)2
Negative lead (-)Body earth
ConditionIgnition switch "START*"
Circuit tester RangeV
Circuit tester ReadingBattery voltage
Battery (ACC or ON)
Check terminals (+)4
Negative lead (-)Body earth
ConditionIgnition switch "ON"
Circuit tester RangeV
Circuit tester ReadingBattery voltage
Battery (ACC or ON)
Check terminals (+)4
Negative lead (-)Body earth
ConditionIgnition switch "START*"
Circuit tester RangeV
Circuit tester Reading0V
Alternator "L" terminal
Check terminals (+)1
Negative lead (-)Body earth
ConditionEngine running
Circuit tester RangeV
Circuit tester ReadingBattery voltage
Alternator "L" terminal
Check terminals (+)1
Negative lead (-)Body earth
ConditionEngine stopped
Circuit tester RangeV
Circuit tester Reading0V
Oil pressure switch
Check terminals (+)5
Negative lead (-)Body earth
ConditionEngine running
Circuit tester RangeV
Circuit tester ReadingBattery voltage
Oil pressure switch
Check terminals (+)5
Negative lead (-)Body earth
ConditionEngine stopped
Circuit tester RangeV
Circuit tester Reading0V
NOTE
*: Disconnect starter motor "S" terminal before turning ignition switch to "START".