No Initial Combustion

• Check ECM power source circuit (ignition keyed).
• Check ignition signal circuit. See SPARK TEST under IGNITION CHECKS in appropriate articles;

For GS300 BASIC TESTING

For SC300 BASIC TESTING

For SC400 BASIC TESTING

• Check fuel pump control circuit. See CODE 78 in appropriate articles;

For GS300 TESTS W/CODES

For SC300 TESTS W/CODES

For SC400 TESTS W/CODES

• Check spark plugs.
• Check fuel injector circuit.