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Fault Code 12

Synopsis

Description: Memory standby power recently lost
Power loss light: Off
Limp-in mode: None


Possible Causes

Battery or power line recently disconnected - This code is normal if the electrical system has been worked on or the battery has recently been disconnected. It will be removed after 15 ignition switch on/off cycles.

Low system voltage, bad battery or battery terminals - If the system recently had a power drop (due to a dead battery or bad alternator), this code will appear. If the battery terminals are bad and the engine was jumped, this code will appear. See the Diagnosing Your Charging System page for more information.

Bad connection or wiring - Check the wiring and connections between the battery, power module, and logic module (or SMEC). Check all fusible links and power connectors to the battery. Clean and regrease any corroded connectors with dielectric grease and repair any shorts.


Diagnostic Method

Trigger Parameters

- Logic module receives power after previously not having power

Results If Component Fails

Fault code 12 is stored. The logic module is basically telling you that it has lost power and will not remember any previously stored codes or engine sensor table data. The code will be removed after 15 ignition on/off cycles and the logic module will use default values for all look-up tables as a starting point until it "learns" the attributes of the engine.


Fault Code 24

Synopsis

Description: Throttle position sensor (TPS) signal is out of range
Power loss light: On
Limp-in mode: MAP sensor is used as an indication of thottle position

Possible Causes

TPS failure - The TPS is located on the throttle body on the opposite side of the throttle cable. Turn the engine off, disconnect the sensor and test it by connecting an ohmmeter (preferably an analog one) between the center and either outside pin of the sensor. Slowly open the throttle all the way and then slowly close it again. The ohmmeter should show a constant, smooth change in resistance as the throttle is moved. If there are any jumps in reading or no change in reading at all, replace the sensor. If the sensor seems ok, reconnect the sensor cable and turn the ignition on. One outside wire should be 5V, the other ground. The voltage on the center wire should vary as the throttle is opened (about 0V closed, 3V wide open). If power or ground is not present, check the wiring.
Bad connection or wiring - Check the wiring and connections between the sensor and the logic module (or SMEC). Clean and regrease any corroded connectors with dielectric grease. Check connections if there is no power or ground, or for shorts if there is power and resistance, but no output.


Diagnostic Method

Trigger Parameters

- Sensor output less than 0.16V or greater than 4.7V
Results If Component Fails

Fault code 24 is stored, the power loss light is turned on, and the logic module will enter limp-in mode. The logic module will then use the MAP sensor as an indication of the thottle position. A MAP sensor voltage less than 2.0V is considered closed throttle and a MAP sensor voltage greater than 2.0V is considered wide open throttle (WOT).


Fault Code 33

Synopsis

Description: Air conditioning cut-out relay circuit is open or shorted
Power loss light: Off
Limp-in mode: None

Possible Causes

Bad connection or wiring - Check the wiring and connections between the logic module and the relay. Clean and regrease any corroded connectors with dielectric grease and repair any shorts.
Bad relay - Disconnect the relay and apply 12V across the coil terminals (dark blue wire on single connector and dark blue with orange stripe on 3-terminal connector). You should hear a click and the connection between the other two terminals should be shorted.


Diagnostic Method

Trigger Parameters

- Near 0V or near 12V not detected when the relay is turned on or off, respectively
Results If Component Fails

Fault code 33 is stored.


Fault Code 55

Synopsis

Description: End of message
Power loss light: Off
Limp-in mode: None

Possible Causes

No further fault codes are stored. If this is the only code received, then there are no codes stored in memory. This code will always be given, even if nothing is wrong. If you do not get this code, then you may not be retreiving the codes properly, or the power loss light may be burnt out. The light should come on for 1 second when the ignition is initally turned on as a bulb test.

Diagnostic Method

Trigger Parameters

- No further codes in memory