Ford Corsar Repair Manual page 217

TROUBLE DIAGNOSES
DlAG
CODE 13
-
OXYGEN SE1
CODE 13 IS SET IF:
UOST
ISOR
(1)
The engine has been running for a minimum number of revolutions
(ie 2000 revolutions). Equivalent to 1 minute at 2000 rpm.
AND
(2)
The engine temperature
>
70 degrees.
AND
(3)
The engine is not operating at idle.
AND
(4)
The system is operating in closed loop zone
AND
(5)
The engine R P M is greater than 1300.
AND
(6)
The oxygen sensor stays in the mid-range for more than 10 seconds
SOCEDURE 11
-
:SIGNAL INDICATES OPEN CIRCUIT).
Engine at normal operating temperature.
Connect diagnostic plug.
Run engine at approx.
-
2000 rpm for 2
minutes and note ECM light.
r - - - -
02 SENSOR
Flashing open loop.
I
Ignition "off".
Disconnect oxygen sensor
and ground lead AN18 to
1
I
DIAGNOSTICS INPUT
- - J
Flashing closed loop.
I
m
I
Stop engine
Ignition on.
Ensure any other codes are noted.
Clear codes.
Remove diagnostic plug.
Run engine at approx. 2000 rpm for two
minutes and note ECM light.
Start engine and hold rpm at
2000 while watching ECM light.
It
may
flash "Open Loop" for
up to 30 seconds. But should
then go out.
(Error code 44, lean could
be set by this test).
Does it?
I
earth.
Light stays "off"
Code 13 is intermittent.
If no other codes were
stored.
Check for an
intermittent fault.
1 I
Light came "on"
plug.
Note code and refer to
applicable code chart.
l
Yes
I
I
I l I
Ignition off.
I
(
Ignition off.
Check for open O2 sensor earth circuit
AE16 between ECM terminal 6 and engine
earth.
If ok, it is a faulty oxygen sensor
connector.
Or sensor. See below.
Check for open O2 sensor signal circuit AN18.
Check for open 0 , sensor earth circuit AE16
between ECM terminal 6 and engine earth.
Check for good continuity from engine block
to battery negative. Repair if bad.
If ckt's AN18 and AE16 are both ok, it,is a faulty ECM.
NOTE: Oxygen sensor contamination
-
If fuel containing lead or silicone is used, or engine repairs using unapproved RTV gasket sealer
are performed, the sensor may be contaminated. It may send a "false" rich exhaust indication to the ECM and the ECM will
attempt to drive the fuel system lean to compensate. Poor driveability or a malfunction code
13
could result.
If this happens, the sensor will need
to
be replaced, but every affempt to locate the source of contamination should be pursued.