Note that component replacement may NOT solve the problem in all cases.
This code will flash whenever the diagnostic terminal is grounded with the
ignition in run, and the engine off. If this code appears while the engine
is running, no reference pulses from the distributor are reaching the
ECM.
Check for a misadjusted throttle position sensor.
Check the wiring and connectors from the oxygen sensor.
Replace the oxygen sensor.
If engine is experiencing overheating, the problem must be fixed before
continuing. Check all wiring and connectors associated with the
coolant temperature sensor.
Replace the coolant temperature sensor.
If engine is experiencing overheating, the problem must be fixed before
continuing. Check all wiring and connectors associated with the
coolant temperature sensor.
Check the wiring connections at the ECM.
Check for a sticking or misadjusted TPS plunger.
Check all wiring and connections between the TPS
and the ECM.
Adjust or replace the TPS.
Check the TPS adjustment.
Check the ECM connector.
Replace the TPS.
Check the MAT sensor, wiring and connectors for an
open sensor circuit. Replace the MAT sensor.
A fault in this circuit should only be detected when the vehicle is moving.
Disregard this code if it is set when the drive wheels are not turning.
Check the connections at the ECM.
Check the TPS setting.
Check the voltage signal from the MAT sensor to the
ECM. It should be above 4 volts.
The EGR solenoid should not be energized
and vacuum should not pass to the EGR valve.
The diagnostic switch should close at about 2 inches of vacuum.
With vacuum applied, the switch should close.
Check the EGR vacuum lines for leaks.
Replace the EGR solenoid.
Replace the EGR valve.
Check the vacuum hoses from the MAP sensor.
Check the electrical connections at the ECM.
Replace the MAP sensor.
This code will be set when the signal voltage from the
MAP sensor is too low. Instead, the
ECM will substitute a fixed MAP value and use the
TPS to control fuel delivery.
Replace the MAP sensor.
This code will be set when the closed throttle speed is 50 RPM above or below
the correct idle speed for 30 seconds. Check for vacuum leaks.
Replace the IAC.
If the vehicle will not start and run, check the wire leading to terminal 12
of the ECM.
Check the EST wire (terminal 19 of the ECM)
leading to the HEI module (terminal E). Check all distributor wires.
Check the wire leading from EST terminal A to ECM
terminal 12, and the wire from EST terminal A to ECM
terminal 3. Replace the HEI module.
Note this service bulletin regarding code 42.
Check the ECM wiring connections, particularly
terminals 15 and 8. Check for vacuum leakage at the
TBI base gasket,
vacuum hoses or the intake manifold gasket.
Replace the oxygen sensor.
Check the evaporative charcoal canister and its components for the presence
of fuel. Replace the oxygen sensor.
Make sure that the PROM is properly installed in the
ECM. Replace the PROM.
Check the CALPAK PROM to insure proper installation. Replace the PROM.
This code will be set if the voltage at ECM terminal
B2 is greater than 17.1 volts for 2 seconds. Check the charging system.
Be sure that the ECM ground connections are tight.
If they are, replace the ECM.
When the Service Engine Soon (Check Engine) light comes on, the ECM has
detected a problem with one of the sensor circuits in the car, and it sets a
trouble code. The ECM holds stored trouble codes in memory as long as it has
power from the battery. To retrieve the stored trouble codes, do the
following:
- Remove the black trim plate on the center console where the cigerette
lighter is.
- Take a paperclip or wire, and ground the two terminals on the top, closest
to the passenger side of the car.
- Watch the Service Engine Soon (Check Engine) light.
It will flash a series of codes at you. First, it should flash:
FLASH-PAUSE-FLASH-FLASH. That is 1-2, code 12.
This signifies that the ECM is not recieving reference pulses from the
distributor, and therefore that the car is not running.
It will flash this code three times, with a long pause between each code.
If there are any stored trouble codes, it will flash them after this, starting
with the lowest numbered codes, up to the highest numbered, each one repeated
three times. It does NOT flash the codes back in the order in which they were
set.
One more example. If you see the following:
FLASH-pause-FLASH-FLASH-long pause
FLASH-pause-FLASH-FLASH-long pause
FLASH-pause-FLASH-FLASH-long pause
FLASH-pause-FLASH-FLASH-FLASH-long pause
FLASH-pause-FLASH-FLASH-FLASH-long pause
FLASH-pause-FLASH-FLASH-FLASH-long pause
FLASH-FLASH-FLASH-FLASH-pause-FLASH-FLASH-FLASH-FLASH-long pause
FLASH-FLASH-FLASH-FLASH-pause-FLASH-FLASH-FLASH-FLASH-long pause
FLASH-FLASH-FLASH-FLASH-pause-FLASH-FLASH-FLASH-FLASH-long pause
FLASH-pause-FLASH-FLASH-long pause
FLASH-pause-FLASH-FLASH-long pause
FLASH-pause-FLASH-FLASH-long pause
Then your ECM is giving you code 13
(oxygen sensor) and
code 44 (lean exhaust).
(In case you are wondering, these are the codes I got when my
Oxygen sensor on my 2m4 went bad.)
From: Sketch
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