Engine Controls - MIL ON/DTC's P0134/P0171 Set: Overview

Classification:
EC02-012

Reference:
ITB02-024

Date:
May 1, 2002

2000-2002 G20 MIL "ON" DTC P0134 OR P0171

APPLIED VEHICLES:
2000-2002 G20 (P11)

SERVICE INFORMATION

If a 2000 to 2002 G20 has a MIL "On" and either of the following DTCs stored in the ECM:

^ P0134-HO2S1 (B1)

^ P0171 - FUEL SYS - LEAN/BK1

Start with the Service Procedure to find out if the bulletin applies to this vehicle. If it does apply, complete the Service Procedure to repair the incident, if it should occur.

SERVICE PROCEDURE

You will be performing the following, as required:

^ Determine the DTC Stored in ECM from the CONSULT-II Self-diagnosis results.

^ ECM Part Number Check to determine if this bulletin applies.

^ ECM Reprogramming (required if the ECM P/N in the vehicle matches one of those listed under "Current ECM PIN" in Chart A ).

^ Replacing the Front Oxygen Sensor (required if ECM Reprogramming is needed).

Determine the DTC Stored in ECM:

1. Determine which DTC code is stored in the vehicle's ECM by performing CONSULT-II Self-Diagnosis.





2. Print out the Self-Diagnosis results for use in ECM Part Number Check, below. See Figure 1 for an example of the CONSULT-II Self-Diagnosis printout.

ECM Part Number Check





1. Compare the vehicle's current ECM P/N (from your CONSULT-II Self Diagnosis printout) to those shown under Current ECM P/N in Chart A, shown.

A. If the ECM P/N in the vehicle matches one of those listed under "Current ECM P/N" in Chart A (above):

^ Look in the "Vehicle" Column in Chart A (above) and determine the vehicle "configuration" (i.e. 2002 M/T). Make a note of the vehicle configuration and perform ECM Reprogramming, below.

B. If the ECM P/N in the vehicle does not match one of those listed under "Current ECM P/N" in Chart A (above):

^ This bulletin does not apply. Use the appropriate Electronic Service Manual (ESM) to further diagnose and repair the incident.

ECM Reprogramming

1. Perform ECM Reprogramming to install the latest available ECM data.

^ If you are unfamiliar with ECM Reprogramming refer to Attachment A shown in this bulletin.

^ For those familiar with ECM Reprogramming, perform the following:





A) Select model and model year for the applied vehicle (i.e. G20, 2002).

B) Locate the vehicle configuration you made note of in step 1A (i.e. M/T) from those listed in the upper right ECM data description window.

C) Make a note of the "To" number listed in the "ECM Reprogramming Data" Summary screen.

NOTE:
The "To" number will read: 23710-XXXXX.

D) Press "Continue" and follow directions to perform data download from ASIST to CONSULT-II.

E) When reprogramming from CONSULT-II, select the "To" number that you made note of in step C, above.

2. Go to and perform Replacing the Front Oxygen Sensor (below).

Replacing the Front Oxygen Sensor

1. Replace the incident bank front oxygen sensor (see the PARTS INFORMATION section for information). Refer to the EC Section of the appropriate Service Manual for part replacement information.

2. Use CONSULT-II to do the following:

^ Confirm DTC P0134 or P0171 is repaired.

^ Erase the DTC code.





PARTS INFORMATION





CLAIMS INFORMATION