Malfunction Indicator Lamp: Testing and Inspection

"Check Engine" Light Schematic:

A faulty "Check Engine" light system does not set a code in the on-board diagnostic system. However, if the system does not operate properly, troubleshooting can identify the problem. Refer to the schematic diagram and test the "Check Engine" light with the diagnostic chart.

Wire color code identification:

L: Blue
B: Black
Y: Yellow
G: Green
R: Red
W: White
Br: Brown
Lg: Light green
Gr: Gray

"Check Engine" Light Diagnostic Chart:

"CHECK ENGINE" LIGHT DIAGNOSTIC CHART

ECU/Crank Angle Sensor Harness Testing:

"CHECK ENGINE" LIGHT VOLTAGE

1. With ignition switch "OFF," disconnect ECU connector.
2. Turn ignition switch "ON."
3. Check voltage between ECU connector terminal (F119)19 and "Check Engine" light. Voltage should be above 9V.