Please check the locations indicated below and follow procedures to extract the code. Send us the code for repair advice or replay with any questions.
DIAGNOSTIC CODESDiagnosis codes
are held in memory and may be displayed by grounding the proper
terminals at the diagnostic connector or check connector. The system
should be interrogated for stored codes before any disconnection of the
battery cables; once disconnected, the stored codes will be lost.
Certain conditions must be met before the codes will be transmitted from
the ECU. The initial conditions are:
Engine at normal operating temperature
Battery voltage 11 volts or above
Throttle fully closed (IDL points engaged)
All accessories and electrical loads
If any of the initial conditions are not met, the ECU will
note a problem and display a switch condition code when the diagnostic
circuit is grounded.Diagnostic Connector Locations
See Figure 1
all equipped vehicles the check connector (near the ignition coil) or
diagnostic connector are located under the hood in the engine area on
the shock tower (passenger side) or near the junction or relay block
(driver's side). A small plastic cap covers the check connector
terminals and hinged plastic cap covers the diagnostic connector. Each
terminal is mark inside the diagnostic cap cover for proper
Fig. Fig. 1: Check connector (lower view) and diagnostic connector (upper view)
Reading Stored Codes
If more than one code is stored, the codes will be transmitted in
numerical order from lowest to highest. The order of the codes does not
indicate the order of fault occurrence.
Check that the initial conditions are met.
Turn the ignition switch
but do not start the engine.
At the diagnostic connector or check connector, use a jumper wire to connect terminals T and E
Observe the CHECK ENGINE warning lamp on the dashboard; read the code(s) based on the number and rate of flashes.
If the system is operating normally, with no codes stored, the
warning lamp will flash on/off in a constant, unchanging pattern. This
is the System Normal signal; the ECU is acknowledging the request for
codes but has nothing to report.
If malfunction codes are stored, the light will blink every
-second. The first number of blinks will indicate the first digit of a 2-digit code. After a 1
second pause, the second digit will be transmitted. If
there is more than one code stored, they will be separated by a 2
-second pause. After all stored codes have been transmitted, the cycle will begin again after a 4
second pause. The codes will continuously transmit until
the jumper wire is disconnected. Even when transmission has stopped,
the codes remain in memory until the memory is cleared.
Record the codes as they are received.
Disconnect the diagnostic jumper; switch the ignition
Clearing Stored Codes
Stored codes will remain in memory until cleared. The
correct method of clearing codes is to turn the ignition switch
, then remove the EFI 15A fuse for at least 30 seconds. The time required will be longer in cold weather.
Disconnecting the negative battery cable will also
clear the memory but is not recommended due to other on-board memories
being cleared as well. Once the system power is restored, re-check for
stored codes. Only the System Normal indication should be present. If
any other code is stored, the clearing procedure must be repeated or the
old code will be stored with any new ones.
After repairs, it is
recommended to clear the memory before test driving the vehicle. Upon
returning from the drive, interrogate the memory; if the original code
is again present, the repair was unsuccessful.