When problems occur in ECU monitored input or output devices, the dash mounted malfunction indicator lamp (MIL) will light ("CHECK") and stay "ON" while faults are present and the engine is running. With the procedure described, malfunction codes can be retrieved from ECU memory in the form of sequential MIL flashes.
NOTE: The ECU constantly checks for input device malfunctions. However, it only checks for output device malfunctions during a three second period after the ignition is switched "ON" with diagnosis connector "TEN" terminal grounded. If there is more than one code present, the lowest number is displayed first, followed by subsequent codes in numerical order.
MALFUNCTION CODE CHART
Fig. 158 Code Chart
Warm engine to operating temperature. Switch ignition "OFF."
Connect jumper wire between diagnosis connector "TEN" and "GND" terminals.
Switch ignition "ON."
If codes are present, the MIL will light in patterns illustrated on the MALFUNCTION CODE CHART.
When all codes have displayed, the sequence will repeat until the jumper wire is removed.
Record codes and repair as necessary. Refer to DIAGNOSTIC CHARTS for code troubleshooting information.
Following repairs, perform after-repair procedure.
CAUTION: Obtain code number and deactivate audio anti-theft system before disconnecting battery. Refer to ADJUSTMENT PROCEDURES.
To erase codes from ECU memory, disconnect negative battery cable and depress brake pedal for at least five seconds. Reconnect battery cable.
Switch ignition "ON" but do not start engine for six seconds.
Start and warm up engine, then run at 2000 rpm for three minutes. Install jumper wire between diagnosis connector "TEN" and "GND" terminals.
Ensure that the MIL no longer flashes malfunction codes.
Tuesday, November 13th, 2012 AT 1:55 AM