2.2L Eng Oxygen Sensor Code - New Control Unit (CAT. 4, NO. 029/87)

Publication date: 1987-08-31
Reference number: CAT. 4, NO. 029/87

2.2L ENG OXYGEN SENSOR CODE - NEW CONTROL UNIT

TECHNICAL SERVICE BULLETIN

Reference Number(s): CAT. 4, NO. 029/87, Date of Issue: 8/31/87

OXYGEN SENSOR

Model: 1987 & 1988 B2200

Bulletin No.: 029/87

Date: 8/31/87

Category: 4

DESCRIPTION

Because the Oxygen 2 sensor fluctuates over a wide range of readings, a specified time (3 minutes) has been allowed to determine a failure. This delay in the failure code eliminates premature and misleading codes.

Previous units (1986 B2000) could indicate a failed Oxygen 2 sensor under certain circumstances without any problem existing. This condition could have occurred under the following examples:

Engine kept idling for extended periods.
High ambient air temperature causing excessive fuel vapors.
If duty is fluctuating at the high end of the range.

The 1987 B2200 control unit is capable of detecting some intermittent failures and storing these in memory until retrieved. To simulate a failed Oxygen 2 sensor, follow the procedure below.

PARTS INFORMATION

NEW PART #	OLD PART #	DESCRIPTION	INTER- CHANGEABILITY	APPLIED MODEL
E532 40 700A	E52140 700	Tail Pipe	NEW to OLD	5-Door Hatchback3-Door Hatchback (except Turbo)
E533 40 700B	E527 40 700	Tail Pipe	NEW to OLD	4 Door Sedan (except Turbo)
E534 40 700A	E540 40 700	Tail Pipe	NEW to OLD	Wagon
B649 40 700A	B649 40 700	Tail Pipe	NEW to OLD	DOHC Turbo(2WD)

NOTE: Simulation of Failed °2 Sensor Procedure

Bring engine to operating temperature.
Turn engine "off".
Disconnect the Oxygen 2 sensor connector.
Restart engine. Hold the engine RPM at 1500 or more for 3 minutes (time is very important). After 3 minutes, trouble code 15 should be indicated and failsafe will fix duty at 20%.
After the simulation test, clear memory by disconnecting the negative battery cable and apply the brake to clear the control unit memory.