P0135 code, need advice

[Redog]

OK I've had the P0135 code for a while now, didn't change with the swapping of the PCM. Car still stumbles under WOT also. I don't think it's P0135 related.

Anyway, new O2 sensor, wiring from O2 sensor and plug to main wiring loom was OK, not burnt wires looked OK, no exposed wire. Still have to check the "ground block" but IDK where that is, maybe somebody can direct me to that.

All the wires going to the PCM seem to be in good shape and not loose.

Does anybody know where this "block" is where the 2 O2 sensors are grounded too and how hard iss it to get to? If anybody else has any ideas, let me know.

[Ttop191]

according to shopkey, they share a common ground (G201) which is under the passengers side of the dash.

[Redog]

OK, does it show where under the dash? I've never been under that side of the dash.

Is there a pic?

[Cliff8928]

Actually, the oxygen sensors use G203 in 99-00. In 2001 the HO2S1 wiring changed to have the ground controlled at the PCM. What is the calibration ID running on the PCM?

Here's the info on the diagram..

(1) Blower Motor Resistor Assembly Connector
(2) Blower Motor
(3) Fuse Block - Right IP, C1 and C2
(4) Inflatable Restraint IP Module
(5) Splice Pack, SP203
(6) G203
(7) Body Control Module (BCM)
(8) Blower Motor Resistor Assembly

[Ttop191]

^ hmm interesting cliff, where do you get your info from, because the ground distribution diagram I had up was for the 2000 model year...

[Cliff8928]

From SI (GM service info)