DTC 0308

ON BOARD DIAGNOSIS LOGIC

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 "FRO2 MNTR-B1 (B2)".
(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-B1(B2)" in "DATA MONITOR" mode changes from "RICH" to "LEAN" to "RICH" 5 times in 1 0 seconds. 5 times (cycles) are counted as shown below:

cycle | 1 | 2 | 3 | 4 | 5

FR O2 MNTR-B1(B2) R-L-R-L-R-L-R-L-R-L-R
R = "FR O2 MNTR-B1(B2)", "RICH"
L = "FR O2 MNTR-B1(B2)", "LEAN"

OR

WITHOUT SCAN TOOLS
(1) Start engine and warm it up sufficiently.
(2) Make sure that malfunction indicator lamp comes on more than 5 times within 10 seconds while keeping at 2,000 rpm in Diagnostic Test Mode II (Front heated oxygen sensor monitor).

DIAGNOSTIC PROCEDURE
For right bank
Refer to TROUBLE DIAGNOSIS FOR DTC P0130.
Refer to TROUBLE DIAGNOSIS FOR DTC P0135.

For left bank
Refer to TROUBLE DIAGNOSIS FOR DTC P0150.
Refer to TROUBLE DIAGNOSIS FOR DTC P0155.