Check Mode Procedure

1NZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: CHECK MODE PROCEDURE

CHECK MODE PROCEDURE
HINT: Techstream only:
Compared to normal mode, check mode has more sensing ability to detect malfunctions. Furthermore, the same diagnostic items which are detected in normal mode can also be detected in check mode.

1. CHECK MODE PROCEDURE (Using Techstream)
(a) Check the initial conditions.
(1) Battery positive voltage 11 V or more
(2) Throttle valve fully closed
(3) Shift position in the P or N
(4) A/C switched OFF
(b) Connect Techstream to the DLC3.
(c) Turn the power switch ON (IG).





(d) Change the ECM to check mode using Techstream. Make sure the MIL flashes as shown in the illustration.
NOTE: All DTCs and freeze frame data recorded will be erased if: 1) Techstream is used to change the ECM from normal mode to check mode or vice-versa, or 2) during check mode, the power switch is switched from ON (IG) to ON (ACC) or OFF.

(e) Start the HV main system (READY ON). The MIL should turn off after the system starts.
(f) Simulate the condition of the malfunction described by the customer.
(g) After simulating the malfunction conditions, check DTCs, freeze frame data and other data using the tester.
(h) After checking DTCs, inspect applicable circuits.