0314906 JOHNSON CLIP, Choke shaft

Table 1
Diagnostic Codes Table
Code Conditions which Generate this Code System Response
266-3 Crank Without Injection Input : Voltage Above Normal The Electronic Control Module (ECM) detects high voltage in the circuit. The code is logged. The fuel injection is disabled. The engine will not start.
266-4 Crank Without Injection Input : Voltage Below Normal The ECM detects low voltage in the circuit. "Crank w/o Injection" is a feature that disables fuel injection during engine cranking. The connector for the crank without injection input is located inside the engine compartment. One of the two connectors for the crank without injection must be installed at all times. For normal operation, the connector HHH (engine run) must be installed. In order for "Crank w/o Injection" to be enabled, connector JJJ (crank w/o injection input) must be installed.
Illustration 1 g01644936
Schematic
Illustration 2 g01416792
P1 ECM connector
(P1-44) Crank without injection input (NC)
(P1-35) Crank without injection input (NO)
Illustration 3 g01415758
Location of ECM connectors
Test Step 1. INSPECT THE ELECTRICAL CONNECTORS AND THE WIRING
Turn the keyswitch to the OFF position.
Thoroughly inspect the J1/P1 connector for the ECM and the connector for the crank without injection. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and the sensor connectors that are associated with the active diagnostic code.
Check the ECM connector (allen head screw) for the proper torque. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and wiring for abrasions and for pinch points from the sensors back to the ECM. Expected Result:All connectors, pins, and sockets are completely inserted and coupled. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The harness and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem in the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.STOPTest Step 2. CHECK THE STATUS ON CATERPILLAR ELECTRONIC TECHNICIAN (ET)
Connect Cat ET to the service tool connector.
Turn the keyswitch to the ON position.
Observe the status for "Crank w/o Injection" on Cat ET.
Turn the keyswitch to the OFF position.
Remove connector HHH (engine run) and install connector JJJ (crank w/o injection input).
Turn the keyswitch to the ON position.
Observe the status for "Crank w/o Injection" on Cat ET. Expected Result:The status reads "Off" when connector HHH (engine run) is installed. The status reads "On" when connector JJJ (crank w/o injection input) is installed.Results:
OK - The feature is working properly.Repair: Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect" if the problem is intermittent.STOP
Not OK - The feature is not working properly. Proceed to Test Step 3.Test Step 3. CHECK THE HARNESS FOR A SHORT CIRCUIT
Turn the keyswitch to the OFF position.
Disconnect the J1/P1 ECM connector and the connector for the crank without injection plug.
Measure the resistance between the following terminals:
P1-44 crank w/o injection input (NC) and every pin on the P1 ECM connector
P1-44 crank w/o injection input (NC) and chassis ground
P1-35 crank w/o injection input (NO) and chassis groundExpected Result:The measurements indicate an open circuit.Results:
OK - The measurements indicate an open circuit. Proceed to Test Step 4.
Not OK - A resistance measurement does not indicate an open circuit. There is a short circuit in the harness between the connector and the ECM.Repair: Repair the circuit.Verify that the repair eliminates the problem.STOPTest Step 4. CHECK THE RESISTANCE THROUGH THE HARNESS
Install connector HHH (engine run) at the connector for the crank without injection.
Measure the resistance between P1-44 crank w/o injection input (NC) and chassis ground.
Remove connector HHH (engine run) and install connector JJJ (crank w/o injection input) at the connector for the crank without injection.
Measure the resistance between P1-35 crank w/o injection input (NO) and chassis ground. Expected Result:The measurements indicate a short circuit.Results:
OK - The measurements indicate a short circuit. Proceed to Test Step 5.
Not OK - A resistance measurement indicates an open circuit or excessive resistance in the harness.Repair: Repair the circuit.Verify that the repair eliminates the problem.STOPTest Step 5. SHORT THE INPUTS AT THE ECM
Fabricate two jumper wires that are long enough to create a short between the ECM connector and the engine ground stud. Crimp a connector socket to one end of each of the jumper wires.
Remove the wire from P1-44 crank w/o injection input (NC). Install a jumper wire into this terminal location.
Remove the wire from P1-35 crank w/o injection input (NO). Install a jumper wire into this terminal location.
Reconnect the J1/P1 ECM connector.
Connect the jumper wire in P1-44 crank w/o injection input (NC) to the engine ground stud.
Turn the keyswitch to the ON position.
Observe the status for "Crank w/o Injection" on Cat ET.
Turn the keyswitch to the OFF position.
Disconnect the jumper wire in P1-44 crank w/o injection input (NC) from the engine ground stud.
Connect the jumper wire in P1-35 crank w/o injection input (NO) to the engine ground stud.
Turn the keyswitch to the ON position.
Observe the status for "Crank w/o Injection" on Cat ET.
Turn the keyswitch to the OFF position. Restore the wiring to the original configuration. Expected Result:The status reads "Off" when the wire short is installed in P1-44 crank w/o injection input (NC). The status reads "On" when the wire short is installed in P1-35 crank w/o injection input (NO).Results:
OK - The ECM is functioning properly. The problem is in the wiring harness.Repair: Repair the circuit.Verify that the repair eliminates the problem.STOP
Not OK - The correct inputs appear at the ECM, but the ECM is not responding properly.Repair: Verify your results. Replace the ECM. Refer to electronic troubleshooting Troubleshooting, "ECM - Replace" before replacing the ECM.STOP