CONTROL GP-ENGINE ELECTRONIC 4176014 - Caterpillar

Illustration 8 g01331468
Typical bypass harness
Illustration 9 g01625152
Pin locations on the breakout connector
(4) Data Link +
(5) Data Link -
(52) SAE J1939 Data Link +
(56) Battery +
(57) Battery +
(61) SAE J1939 Data Link -
(68) Battery -
(69) Battery -
(70) Keyswitch
Batteries give off flammable fumes which can explode.To avoid injury or death, do not strike a match, cause a spark, or smoke in the vicinity of a battery.
Do not connect the bypass harness to the battery until the 20 Amp in-line fuse has been removed from the Battery + line. If the fuse is not removed before connection to the battery, a spark may result.
Turn the keyswitch to the ON position.
Disconnect engine harness connector J1/P1 from the ECM.
Construct a bypass harness for the electronic service tool. Connect the bypass harness to ECM connector J1. Refer to Illustration 8 for the bypass harness.Note: This bypass directly connects the circuit for the keyswitch to the ECM. The ECM will remain powered until the connection to the unswitched battery + line is disconnected. Remove the 20 Amp fuse from the in-line fuse holder to power down the ECM. Do not connect the bypass to the battery posts without first removing the 20 Amp in-line fuse or do not remove the bypass from the battery posts without first removing the 20 Amp in-line fuse.Expected Result:The electronic service tool is operating correctly.Results:
OK - Repair: Perform the following repair:There is a problem in the wiring. Inspect the wiring and fuses to the connector. Repair the wiring and/or batteries, or replace the wiring and/or batteries, as required.Verify that the repair eliminates the fault.STOP
Not OK - Verify that the 20 Amp fuse in the bypass harness of the electronic service tool is not open. A fuse that is open is a blown fuse. Proceed to Test Step 8.Test Step 8. Change Electronic Service Tool Components
If another electronic engine is available, connect the electronic service tool to the other engine. Ensure that the same cables are used.
Turn the keyswitch to the ON position. Determine if the electronic service tool operates correctly on the other engine.
If another engine is not available in the shop, find a different set of electronic service tool cables. Ensure that the set of electronic service tool cables is a complete set.
Use the new set of cables and connect the electronic service tool to the Data Link connector.
Turn the keyswitch to the ON position.
If changing cables allows the electronic service tool to operate properly, use the following procedure:
Replace the pieces from the old set of cables into the new set of cables that operate. Replace one cable at a time.
Apply power to the electronic service tool after each of the cables is replaced. Use this method to find the faulty piece.
If changing cables does not allow the electronic service tool to operate properly, connect another electronic service tool.
Turn the keyswitch to the ON position. Expected Result:Result 1 The original electronic service tool works on another engine.Result 2 A different electronic service tool works on the original engine while the engine