Written by Hawaiian Hardbody

Start engine.

Turn the dial on the ECM fully clockwise.

After the LED flashes 5 times, turn the dial fully counter clockwise.

Make sure LEDs do not flash for 5 minutes when racing or idling the engine.

If it flashes, count the number of flashes, turn engine off, and see decoding chart. Perform real-time diagnosis insepction and repair or replace malfunctioning part if present.

If LEDs do not flash for 5 minutes, turn engine off.

"decoding chart:"

If the RED LED flashes 3 times for 1.5 seconds, check the Crankshaft Position Sensor. Check the harness continuity at CPS when the engine is stopped. Inspect the harness for dust and clean if necessary. Check the pin terminal at ECM for bends and remove them as necessary. Reconnect harness and recheck continuity. During real-time diagnosis, tap the harness connector or component and check if trouble code is displayed. If so, replace terminal.

If the GREEN LED flashes twice-3 times for 0.5 seconds, check Mass Air Flow Sensor. Check the harness continuity at MAF when the engine is stopped. Inspect the harness for dust and clean if necessary. Check the pin terminal at ECM for bends and remove them as necessary. Reconnect harness and recheck continuity. During real-time diagnosis, tap the harness connector or component and check if trouble code is displayed. If so, replace terminal.

If GREEN LED flashes 4 times for 0.2 seconds 3 times, check the ignition signal. Check the harness continuity when the engine is stopped. Inspect the harness for dust and clean if necessary. Check the pin terminal at ECM for bends and remove them as necessary. Reconnect harness and recheck continuity. During real-time diagnosis, tap the harness connector or component and check if trouble code is displayed. If so, replace terminal.