B Series Truck 4WD L4-2606cc 2.6L SOHC (1992)
Fuel Pump Relay: Testing and Inspection
Fuel Pump Relay (Circuit Open Relay)
^ Perform tests in order listed.
TEST 1 - RELAY SWITCHING FUNCTION CHECK
1.
Disconnect relay from its harness connector.
2.
Apply 12 volts and ground to relay terminals listed below and check for correct result.
12V/Grnd - CORRECT RESULT
"STA"/"E1"
-
Energizes relay, connects terminals "B" and "Fp" (continuity).
"B"/"Fc" -
Energizes relay, 12 volts becomes available at terminal Fp.
^ If results are not correct as described, replace relay.
TEST 2 - RELAY RESISTANCE CHECK
^ Check resistance between the following relay terminals.
"STA"/"E1"
-
Resistance: 21 - 43 ohms
"B"/"Fc" -
Resistance: 109 - 226 ohms
"B"/"Fp" -
Resistance: infinite (no continuity)
^ If results are not as described, replace relay.
TEST 3 - RELAY CIRCUIT (WIRING) CHECK
^ Check voltage at following terminals with relay installed, under conditions listed below.
3A - IGNITION "OFF"
No voltage at any terminal.
3B - IGNITION "ON" ENGINE NOT RUNNING
Terminal "STA"
- 0 volts
Terminal "B" - 12 volts
Terminal "Fp" - 0 volts
Terminal "Fc" - 12 volts
3C - IGNITION IN "START" POSITION (CRANKING)
Terminal "STA"
- 12 volts
Terminal "B" - 12 volts
Terminal "Fp" - 12 volts
Terminal "Fc" - 0 volts (or nearly zero)
3D - IGNITION "ON" ENGINE RUNNING