With Message Center

NOTE: It may be necessary to service non-EEC-IV faults before running the quick test.
Continuous codes recorded in this step will be used for diagnosis in CONTINUOUS MEMORY CODES after a pass code is received in both Key On Engine Off (KOEO) and Engine Running (ER) self-tests.
Deviation from this procedure may cause false codes to be output.

1. START engine and bring to normal operating temperature.
NOTE: If engine will not start or stalls after starting, proceed with the Key On Engine Off (KOEO) self test.
2. Turn the key OFF, then wait ten seconds.

Electronic Instrument Cluster Center In Self-Test Mode:

3. Depress and hold the Gauge Select, English Metric, and Speed Alarm buttons at the same time, then turn the ignition switch to the ON position and release the buttons.
4. Press the gauge select button three times, until cluster mode "dEALEr 4" is displayed.

Jumper Wire Installed Between Pin #2 And Self Test Input (STI):

5. To start the self test either jumper the STI to SIG RTN, or connect a scan tool and depress the test activation switch.
6. Record all codes received.
7. To exit the self-test, turn the ignition switch to the OFF position and remove the jumper wire or unlatch the scan tool switch and remove the scan tool.
8. If a pass code (11 or 111) is received for hard codes (11/111-10-any code), proceed with substep a. If any hard codes are received, refer to the appropriate service code chart for diagnostic path.
After completing the proper pinpoint test(s), return to this test and perform the KOEO test again. If no codes are received, go to pinpoint test QA, step QA1. QA1 - Check VREF Voltage At Self-Test Connector
a. IF THE CHECK ENGINE LIGHT IS ON:
Refer to the appropriate continuous memory code chart before addressing any other symptoms.
b. IF ENGINE RUNS OR IDLES ROUGH:
Go to pinpoint test S, step S1. S1 - ISC-BPA Check
c. IF CONTINUOUS MEMORY FAULT CODES 45, 46, 215, 216, 217, 232, OR 238 WERE RECEIVED DURING KOEO SELF TEST:
Go to IGNITION SYSTEMS for diagnostics.
IF THESE CODES WERE NOT RECEIVED:
Go to pinpoint test S, step S2. S2 - Check For RPM Drop
d. IF NONE OF THE ABOVE SITUATIONS ARE PRESENT:
Perform computed timing check. 3.1-4.0 - Check for Codes/Computed Timing Check