12A Fault Code 27 Injector 3 & 4

1. Connect diagnostic read-out tool to engine test connector.
2. Turn ignition off, then connect a voltmeter between tan wire of injector 6-way connector and ground.
3. Disconnect electrical connectors from injector Nos. 1 and 2.
4. Disconnect red connector from logic module, then connect one end of a jumper wire to terminal No. 3 of connector.
5. Press ATM button on read-out tool, then make and break jumper wire connection to ground several times.
6. If voltmeter pulsates as connection is made, replace logic module.
CAUTION: Before replacing the logic module check the terminal in cavity No. 3 of the red connector to make sure it is not crushed causing a poor connection.
7. If voltmeter does not pulsate as connection is made, proceed to Test 12 step B.