Code 0308

OVERALL FUNCTION CHECK
This procedure can be used for checking the overall function of the closed loop control. During this check, a DTC might not be confirmed.

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) Make sure of the following.
- "FR O2 MNTR-B1(B2)" 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 1 | 2 | 3 | 4 | 5
FR O2 M NTR-B 1 (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

NO TOOLS
1) Start engine and warm it up sufficiently.
2) Make sure that malfunction indicator lamp goes 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 0503.
Refer to TROUBLE DIAGNOSIS FOR DTC 0901.
For left bank
Refer to TROUBLE DIAGNOSIS FOR DTC 0303.
Refer to TROUBLE DIAGNOSIS FOR DTC 1001.