Diagnostics.
To read codes, plug the two black ones together, switch ignition to on, count the flashes
The long pulses (1.3 Seconds) indicate Tens and the short pulses (0.2 Seconds) indicate ones. Pulses are separated by Short Pauses (0.2 Seconds), multiple codes are separated by a Long Pause (1.8 Seconds).
The simplest way for an inexperienced mechanic to retrieve codes is to write the codes down in a sort of Morse Code (dots and dashes), and start a new line when you get a 1.8 Second pause (for NEW code), and then add the actual numbers up after code retrieval is completed.
(See Example Below)
--- CODE EXAMPLE, SINGLE CODE ---
1.3 second pulse (10)
0.2 second pause
1.3 second pulse (10?.for a total of 20)
0.2 second pause
0.2 second pulse (1?..for a total of 21)
0.2 second pause
0.2 second pulse (1?..for a total of 22)
0.2 second pause
0.2 second pulse (1?..for a total of 23)
(Code 23 ? MAF Sensor)
--- CODE EXAMPLE, MULTIPLE CODE ---
1.3 second pulse (10)
0.2 second pause
1.3 second pulse (10?.for a total of 20)
0.2 second pause
0.2 second pulse (1?..for a total of 21)
0.2 second pause
0.2 second pulse (1?..for a total of 22)
0.2 second pause
0.2 second pulse (1?..for a total of 23)
1.8 second pause (this means NEW code)
1.3 second pulse (10)
0.2 second pause
0.2 second pulse (1?..for a total of 11)
0.2 second pause
.2 second pulse (1?..for a total of 12)
(Codes 23 and 12, MAF Sensor and Starter Circuit)
How to clear them!
Ensure engine is at normal operating temperature, turn engine off
Locate the two ECU connectors, located under the steering column and consist of a black plastic male and female connector, and a green male female connector
With the ignition OFF connect black to black and green to green.
Turn on ignition, do not start the engine, depress the accelerator pedal to full throttle, then return it to the half-throttle position and hold for a few seconds, and then release
Engine Check lamp turns on
Start engine and then drive for at least one minute, keeping road speed above 10mph.
ECU is now re-set.
At this point the check engine light should start to flash the all clear signal (steady 1/2 second interval flashes). If the check engine light does not flash, or indicates some other sequence, there is a fault present in the system, and should be professionally checked for necessary repairs.
Stop the car and turn off the engine.
Disconnect the black and green connectors.
Job complete
