Fuel Delivery and Air Induction: Testing and Inspection

3MZ-FE FUEL SYSTEM:

ON-VEHICLE INSPECTION

1. CHECK FOR FUEL PUMP OPERATION AND INSPECT FOR FUEL LEAK
(a) When using Techstream:
Check fuel pump operation.
(1) Connect Techstream to the DLC3.
(2) Turn the ignition switch ON and push the Techstream main switch ON.

NOTE: Do not start the engine.

(3) Select the ACTIVE TEST mode on Techstream.
(4) If you need help selecting the ACTIVE TEST on the Techstream, refer to the Techstream's instruction manual.
(5) Turn the ignition switch OFF.
(6) Disconnect Techstream from the DLC3.

(b) When not using Techstream: Check fuel pump operation.
(1) Remove the C/OPN relay from the engine room J/B.
(2) Using a service wire, connect terminals FP and +B of the engine room J/B.

NOTE: Pay close attention to the terminal connecting position to avoid a malfunction.

(3) Turn the ignition switch ON, and check that the fuel pump operates.

NOTE: Do not start the engine.

(c) Check that there are no fuel leaks after doing maintenance anywhere on the fuel system.
(d) Turn the ignition switch OFF.
(e) Remove the service wire from the engine room J/B.
(f) Install the C/OPN relay to the engine room J/B.
2. CHECK FUEL PRESSURE
(a) Check that the battery positive voltage is above 12 V.
(b) Disconnect the cable from the negative (-) battery terminal.

NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Repair Instruction - Initialization).

(d) Disconnect the fuel tube connector from the fuel pipe by pinching part A with your fingers, as shown in the illustration.

- Always read the precautions (Service Precautions) before disconnecting the fuel tube connector (quick type).

- The fuel pipe line may spray fuel as a result of retained pressure that remains in it. Do not allow fuel to be sprayed in the engine compartment.

(e) Install SST (pressure gauge) and the fuel tube connector using SST as shown in the illustration.
SST: 09268-31012
09268-41500
90467-13001
95336-08070
SST: 09268-45014
09268-41200
09268-41220
09268-41250
(f) Wipe up any gasoline.
(g) Reconnect the cable to the negative (-) battery terminal.

NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Repair Instruction - Initialization).

(h) When using Techstream:
Operate the fuel pump (See procedure 1).
(i) When not using Techstream:
Operate the fuel pump (See procedure 2).
(j) Measure the fuel pressure.
Fuel pressure:
304 to 343 kPa (3.1 to 3.5 kgf/cm2, 44 to 50 psi)
If the pressure is high, replace the fuel pressure regulator.
If the pressure is low, check the fuel hoses and connections, fuel pump, fuel filter and fuel pressure regulator.
(k) Start the engine.
(l) Measure the fuel pressure at idle.
Fuel pressure:
304 to 343 kPa (3.1 to 3.5 kgf/cm2, 44 to 50 psi)
(m) Stop the engine.
(n) Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped.
Fuel pressure:
147 kPa (1.5 kgf/cm2, 21 psi)
If the pressure is not as specified, check the fuel pump, pressure regulator and/or injectors.
(o) After checking the fuel pressure, disconnect the cable from the negative (-) battery terminal and carefully remove SST and the fuel tube connector to prevent gasoline from spraying.
(p) Reconnect the fuel inlet tube (fuel tube connector).

CAUTION: Always read the precautions (Service Precautions) before connecting the fuel tube connector (quick type).