Service Manual - Revised Diagnostic Aids/DTC PO134

File in Section: 6E - Engine Fuel & Emission

Bulletin No.: 51-65-60

Date: September, 1995

SERVICE MANUAL UPDATE

Subject:
Section 6E3 - Driveability and Emissions - Revised Diagnostic Aids on the Facing Page of DTC PO134 Heated Oxygen Sensor (HO2S) Error

Models:
1994-95 Chevrolet Lumina
1994-95 Oldsmobile Cutlass Supreme
1994-95 Pontiac Grand Prix
with 3.4L Engine (VIN X - RPO LQ1) (SFI)

This bulletin is being issued to correct the Diagnostic Aids section of the facing page for DTC P0134 - Heated Oxygen Sensor (HO2S) Error.

THE FAULTY HO2S HEATER OR HEATER CIRCUIT IS INCORRECT

With the ignition "ON" the Tech 1 displays an HO2S voltage at bias (approximately 450 mV). The Tech 1 display will not change from the bias voltage reading. With the ignition "ON", engine running, the vehicle will remain in open loop until the following conditions are met:

^ Engine run time is greater than 40 seconds.

^ Engine coolant temperature is above 43°C (110°F).

^ Throttle angle is greater than 3%.