DTC 0307

NOTE: The closed loop control has one trip detection logic.




DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the closed loop control. During this check, a 1st trip DTC might not be confirmed.

WITH CONSULT
(1) Start engine and warm it up sufficiently.
(2) Select "MANU TRIG" and "HI SPEED" in "DATA MONITOR" mode with CONSULT, and select "FR O2 SENSOR" and "FR O2 MNTR".
(3) Hold engine speed at 2,000 rpm under no load during the following steps.




(4) Touch "RECORD" on CONSULT screen.
(5) Check the following.
- "FR O2 MNTR" in "DATA MONITOR" mode changes from "RICH" to "LEAN" to "RICH" 5 times in 10 seconds.
5 times (cycles) are counted as shown below:

cycle: I 1 I 2 I 3 I 4 I 5 I
FR O2 MNTR: R-L-R-L-R-L-R-L-R-L-R
R = "FR O2 MNTR", "RICH"
L = "FR O2 MNTR", "LEAN"

OR

WITHOUT SCAN TOOLS
(1) Start engine and warm it up sufficiently.
(2) Check that malfunction indicator lamp goes on more than 5 times in 10 seconds while keeping at 2,000 rpm in Diagnostic Test Mode II.

DIAGNOSTIC PROCEDURE
Refer to TROUBLE DIAGNOSIS FOR DTC P0130.
Refer to TROUBLE DIAGNOSIS FOR DTC P0141.