0317291 JOHNSON SUPPORT, Stbd., rear

Table 1
Diagnostic Trouble Codes for the Circuit for the Injector Solenoids
J1939 Code Description Notes
651-5 Engine Injector Cylinder #01 : Current Below Normal These diagnostic codes indicate an open circuit (low current) in either the solenoid or the wiring for the electronic unit injector.
The Electronic Control Module (ECM) detects the following conditions:
A low current condition (open circuit) for each of five consecutive attempts to operate
Battery voltage above 9 VDC for 2 seconds
If equipped, the warning light will come on. The ECM will log the diagnostic code.
The engine will have low power and/or rough running.
When an "Cylinder Cutout Test" is performed, a faulty electronic unit injector will indicate a low reading in comparison with the other electronic unit injectors.
The ECM will continue to attempt to operate the electronic unit injector after the diagnostic code has been logged. An open circuit will prevent the operation of the electronic unit injector.
652-5 Engine Injector Cylinder #02 : Current Below Normal
653-5 Engine Injector Cylinder #03 : Current Below Normal
654-5 Engine Injector Cylinder #04 : Current Below Normal
655-5 Engine Injector Cylinder #05 : Current Below Normal
656-5 Engine Injector Cylinder #06 : Current Below Normal
651-6 Engine Injector Cylinder #01 : Current Above Normal These diagnostic codes indicate a short circuit (high current) in either the solenoid or the wiring for the electronic unit injector.
The ECM detects the following conditions:
A high current condition (short circuit) for each of five consecutive attempts to operate
Battery voltage above 9 VDC for 2 seconds
If equipped, the warning light will come on. The ECM will log the diagnostic code.
The engine will have low power and/or rough running.
The ECM will continue to attempt to operate the electronic unit injector after the diagnostic code has been logged. A short circuit will prevent the operation of the electronic unit injector.
652-6 Engine Injector Cylinder #02 : Current Above Normal
653-6 Engine Injector Cylinder #03 : Current Above Normal
654-6 Engine Injector Cylinder #04 : Current Above Normal
655-6 Engine Injector Cylinder #05 : Current Above Normal
656-6 Engine Injector Cylinder #06 : Current Above Normal An electrical fault can prevent the electronic unit injector from operating. An open or short circuit in the ECM that is unique to one electronic unit injector will prevent that electronic unit injector from operating. An open or short circuit in common wiring within the ECM can prevent the two electronic unit injectors that share that common wiring from operating.Perform this procedure under conditions that are identical to the conditions that exist when the fault occurs. Typically, faults with the injector solenoid occur when the engine is warmed up and/or when the engine is under vibration (heavy loads).These engines have Electronic Unit Injectors (EUI). The ECM sends a pulse to each injector solenoid. The pulse is sent at the correct time and at the correct duration for a given engine load and speed. The solenoid is mounted on top of the fuel injector body.If an open circuit is detected in the solenoid circuit, a diagnostic code is generated. The ECM continues to try to fire the injector. If a short circuit is detected, a diagnostic code is generated. The ECM will periodically try to fire the injector. If the short circuit remains, this sequence of events will be repeated until the fault is corrected."Injector Solenoid Test"Use the "Injector Solenoid Test"to diagnose an open or short circuit diagnostic code while the engine is not running. The "Injector Solenoid Test" will send a signal to each solenoid. The electronic service tool will indicate the status of the solenoid as "OK", "Open", or "Short".
Illustration 1 g02857098
Schematic of the circuit for the injector solenoids
Illustration 2 g01981233
View of the pin locations on the P2 connector for the injector solenoids
(60) Supply (cylinder 1)
(59) Return (cylinder 1)
(52) Supply (cylinder 2)
(51) Return (cylinder 2)
(63) Supply (cylinder 3)
(64) Return (cylinder 3)
(66) Supply (cylinder 4)
(65) Return (cylinder 4)
(62) Supply (cylinder 5)
(61) Return (cylinder 5)
(50) Supply (cylinder 6)
(49) Return (cylinder 6)
Illustration 3 g02041293
Typical example of the fuel injector
Illustration 4 g01951833
Typical example of the harness connector for the fuel injectors
Illustration 5 g01951828
Typical example of the connector in the cylinder head
Test Step 1. Inspect Electrical Connectors and Wiring
Electrical Shock Hazard. The electronic unit injectors use DC voltage. The ECM sends this voltage to the electronic unit injectors. Do not come in contact with the harness connector for the electronic unit injectors while the engine is operating. Failure to follow this instruction could result in personal injury or death.
Turn the keyswitch to the OFF position. A strong electrical shock hazard is present if the keyswitch is not turned OFF.
Thoroughly inspect the connectors at the cylinder head. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with injector solenoids.
Check the screw for the ECM connector for the correct torque of 6 N m (53 lb in).
Check the harness and wiring for abrasion and for pinch points from the injectors to the ECM. Results:
All connectors, pins, and sockets are correctly connected and/or inserted and the harness is free of corrosion, of abrasion and of pinch points. - The harness is OK. Proceed to Test Step 2.
There is a fault in the connectors and/or the harness. - Repair: Repair the connectors or the harness and/or replace the connectors or the