Heater Fuel Pump (For 2Ad-Fhv) On-Vehicle Inspection

Disconnect the connector from the heater fuel pump.

Measure the voltage and resistance according to the value(s) in the tables below.

Standard voltage:

Tester connection	Condition	Specified condition
2 - Body ground	Engine switch: START Power heater switch: ON	10 to 14 V
2 - Body ground	Engine switch: START Power heater switch: OFF	Below 1 V

Standard resistance:

Tester connection	Condition	Specified condition
1 - Body ground	Always	Below 1 Ω

Measure the resistance according to the value(s) in the table below.

Standard resistance:

Tester connection	Condition	Specified condition
2 - 1	Always	9 to 12 Ω

Inspect heater fuel pump operation.

1. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1, and check the pressure of the hose by hand.
   

   NOTICE:

   This inspection must be done quickly (within 10 seconds) to prevent damage to the heater fuel pump.

   OK:

   The pressure is applied to the hose.
   

   If the result is not as specified, replace the heater fuel pump.