840739 Mercruiser PIN

Operator Information
* What happened, and when?* Under what conditions?* Does the problem occur at specific engine speeds?* Does the problem occur only when the engine is cold or warmed up, when the weather is cold or warm?* Certain altitudes, loads, gears, etc.* Does the problem occur when other vehicle systems are engaged, or are other vehicle systems also malfunctioning?* What else occurred?* When did the symptoms begin (and what else happened at that time)?Logged Diagnostic Codes
* Do they correlate to probable causes? Did they occur at the same time as the symptoms?* Are some logged repeatedly?Other Symptoms
* Are they related to this symptom?* Do they have common probable causes?* Finally, test each probable cause using the tests suggested by the procedure. Be sure to check connectors, especially on intermittent problems! Do not exchange components to avoid troubleshooting a repeatable problem.P-301: Electronic Service Tool Will Not Communicate With ECM
Probable Root Causes for ECAP:* ECAP connector is receiving battery voltage but the ECM is not* Battery power or ground to ECM (machine wiring)* ECAP cable problem* Machine harness data link wiring problem* ECM or Personality Module problem Perform The Following Tests In Order:1. Ensure the keyswitch is in the ON position and any override switches are not creating the problem, or start the engine and then connect an ECAP. If communication occurs when the engine is started, but not with the keyswitch in the ON position, some type of override switch or system is preventing power to the ECM.2. Start engine, if it cranks, but will not start check the ECM power and ground connections, and the ECM 40-Pin Connectors. Wire a bypass as indicated in the last step of P-503: Electrical Power Supply To The ECM if necessary. For further information refer to P-503: Electrical Power Supply To The ECM.3. Start engine, if it starts, but will not communicate check the Electronic Service Tool connections and wiring. Connect another Electronic Service Tool to the system, and also try another Electronic Service Tool harness cable to determine if the problem is with the Electronic Service Tool or the harness. For further information refer to P-532: ATA (SAE J1587) Data Link.4. Start engine, if it starts, but will not communicate, connect a 40-Pin Breakout T into J1/P1 and access the power (pin-6), ground (ground stud), Data Link+ (pin-7), and Data Link-(pin-1). Make jumper wires and connect these directly to the Electronic Service Tool harness. For further information refer to P-532: ATA (SAE J1587) Data Link.5. Start engine, if it cranks, but will not start and the battery connections have been thoroughly inspected (with no problem found), connect another ECM (first transfer the Personality Module Data from the suspect ECM to the known good ECM). For further assistance refer to P-513: ECM/Personality Module. A new ECM has an unprogrammed Personality Module, and will cause this symptom. Probable Root Causes for ET:* Connector or wiring problem in electronic system wiring harness* Electronic Technician or Communication Adapter Service Tool cable problem* Electrical power supply; faulty keyswitch or input to ECM* Data Link problem* ECM or Personality Module problem Perform The Following Tests In Order:1. Check the wiring harness including ECM Connectors J1/P1, J2/P2, Machine Interface connector J3/P3 and Service Tool Connector J8/P8 for opens/shorts. Refer to P-501: Inspecting Electrical Connectors2. Verify correct operation of Electronic Service Tool and Communication Adapter Tool and connector cables on another engine if possible.3. Refer to P-503: Electrical Power Supply to the ECM. If the keyswitch is not receiving battery voltage, the ECM will remain in a powered down (OFF) state. It can not communicate until 24 VDC is applied to the keyswitch input.4. Refer to P-532: ATA (SAE J1587) Data LinkP-302: ECM Will Not Accept Factory Passwords
Probable Root Causes:* Incorrect screen (Electronic Service Tool expects customer passwords)* Incorrect information used to obtain password* Error entering password* Error entering Reason Code Perform The Following Tests In Order:1. Verify that the Electronic Service Tool is on factory password screen (and expects Factory Passwords rather than Customer Passwords).2. Verify engine serial number used to calculate password was from Electronic Service Tool screen, not from the engine information plate. Verify all information on the Electronic Service Tool screens was provided to Caterpillar to get the password. A new ECM comes with the engine serial number programmed as OXXOOOOO. Be sure to use this number in getting passwords.3. Verify correct passwords were entered (upper case only). Also check each character in password for accuracy (for instance I vs. 1, Z vs. 2, O vs. 0, etc). Turn the keyswitch to the OFF position, then retry. Refer to Passwords for more details. Verify correct Reason Code was entered (upper case only). Turn the keyswitch to the OFF position, then retry.P-303: Diagnostic Lamp Is Malfunctioning
Probable Root Causes:* Lamp does not come ON; burned out bulb or machine lamp circuit problem* Check Engine Lamp continuously flashing; Lamp Flash Switch shorted* Check Engine Lamp continuously ON (not flashing) machine harness is shorted* Intermittent diagnostic codes Perform The Following Tests In Order:1. Check Engine Lamp-turn the keyswitch to the ON position, engine OFF. The Check Engine Lamp should come ON and then turn OFF (it will continue to flash if there is an Active diagnostic code). If the lamp does not operate as indicated above, remove the Check Engine Lamp (pin-22) from J1/P1 ECM 40-Pin connector and connect to the Ground Stud while observing the lamp. If the lamp comes ON, check the ECM power and ground connections. If the lamp does not come ON, the lamp is either burned out, its connections are corroded, or it is not connected to power through the machine harness. For further assistance, refer to P-506: Check Engine and Warning Lamp.2. Connect an Electronic Service Tool and observe the status screen for the Lamp Flash Switch. If the switch status indicates ON when a switch is not in the ON position, it is shorted. If this is not the problem, check for Active diagnostic codes. If none are