Engine Controls - Revised DTC P1601 Serial Communication

File In Section: 6E - Engine Fuel & Emission

Bulletin No.: 61-65-67

Date: January, 1997

SERVICE MANUAL UPDATE

Subject:
Section 6E - Engine Controls - Revised DTC P1601 - Serial Communication
Malfunction

Models:
1996-97 Buick Skylark
1996-97 Chevrolet Cavalier
1996-97 Oldsmobile Achieva
1996-97 Pontiac Grand Am, Sunfire
with 2.2L, 2.4L Engine (VINs 4, T - RPOs LN2, LD9)

This bulletin is being issued to revise the DTC P1601 table for the following Service Manuals:

^ 1996 GMP/96-J-2

^ 1996 GMP/96-N-2

^ 1997 GMP/97-J-2

^ 1997 GMP/97-N-2

In Step 2, the test description should read: When the PCM controlled coolant level telltale stays illuminated, serial data is lost to the IPC.

If the engine starts and continues to run, an optional test is to observe the following telltales and gauges for proper operation. If all of these telltales illuminate or the gauges are not operating properly, serial data is lost to the IPC:

^ Oil Pressure Telltale

^ Voltage Telltale

^ Tachometer (if equipped)

^ Temperature gauge (if equipped)

In Step 2 of the Action column, the statement should read as follows:

1. Turn the ignition switch ON with the engine OFF.

2. Observe the IPC and check the Coolant Level telltale for illumination.

Is the telltale ON?