3838693 Volvo.Penta Engine control unit

Check Engine Light
A cab mounted "Check Engine" light is included with the 3406B PEEC engine. The "Check Engine" light indicates an engine fault condition or a 3406B PEEC system fault.If the check engine lamp is on during normal engine operation, the 3406B PEEC has detected a system fault. Use the Check Engine light in the cab or service tools to identify the diagnostic code. Check Engine Light - The "Check Engine" light will be ON and will blink every five seconds whenever a diagnostic fault is detected by the ECM. The light should also be ON whenever the START switch is turned on, but the engine is not running. This condition will test whether the light is operating correctly.If the Check Engine light comes on and stays on after initial start-up, the 3406B PEEC has detected a system fault.Diagnostic Codes-Interpretation
When The Vehicle Is Equipped With Cruise Control (CC):
If the truck is equipped with cruise control (CC), turn the CC switch to OFF and move the SET/RESUME switch to RESUME position. The Check Engine Light will flash to indicate a 2-digit fault code while the switch is held in the RESUME position.When The Vehicle Is Not Equipped With Cruise Control (CC):
Some trucks are equipped with a Check Engine Light Switch to check diagnostic codes.
Check Engine Light Diagnostic Connection The Check Engine Light can be used to communicate the specific PEEC system diagnostic fault. This can be done by connecting a push button momentary switch from position E of connector P1 to ground.With the Check Engine light switch ON, the Check Engine light will then flash to indicate the 2-digit diagnostic fault code. This can be done by connecting a push button momentary switch from position E of connector P1 through the momentary switch and back to position B of connector P1.With the switch depressed, the "Check Engine" light will begin to flash. The sequence of flashes represents the 3406B PEEC system diagnostic message.The first sequence of flashes adds up to the first digit of the diagnostic code. After a two second pause, a second sequence of flashes will occur which represents the second digit of the diagnostic code. Any additional codes will follow and will be displayed in the same manner.Refer to 3406B PEEC Truck Engine Test Procedures, Form SENR3479 and the Service Manual for troubleshooting the 3406B PEEC System. For further information or assistance for repairs, contact an authorized Caterpillar dealer.Some trucks have electronic dashboards that provide a direct readout of 3406B PEEC engine diagnostic codes. Follow the truck manufacturer's instructions to obtain engine diagnostic codes.Use the light in the cab to determine the diagnostic code. Otherwise the fault can be identified using a Caterpillar service tool, ECAP (Electronic Control Analyzer Programmer) or DDT (Digital Diagnostic Tool).Interpreting Diagnostic Codes
When reading diagnostic codes with one of the procedures outlined in the previous section, a Code 55 is displayed, then the system has not detected any faults or codes. The following is a list of 3406B PEEC diagnostic (fault) codes and their descriptions. Contact an authorized Caterpillar dealer for further information or repairs.Permanent Fault Logging
When equipped with permanent fault logging personality module (8TC8565-UP and engines reworked with new module), Fault Code 46-Low Oil Pressure, will NOT be broadcast with the ignition key ON only and the engine not running. If there are no active faults, the only fault that is displayed with ignition key ON is Fault Code 34-Loss of Engine rpm Signal.Intermittent Fault
If the Check Engine light comes on during engine operation, and then goes out, an intermittent fault may be occurring.The 3406B PEEC is equipped with permanent fault logging. It will automatically log (or remember) most intermittent faults to help a service technician diagnose an engine problem.To read Diagnostic Codes with the Check Engine Light, the Cruise Control Switches must be used with the ON/OFF switch in the OFF position. Then hold the SET/RESUME switch in RESUME position. Refer to Reading Diagnostic Codes in this section for information.If there are no active codes logged into the system, only Code 34-Loss of Engine Speed Signal will be displayed.Any diagnostic codes that have been logged since the ignition key was ON and all current codes will be broadcast.With the ignition key in the ON position and the engine not running, the Check Engine Light will turn ON for five seconds, blink OFF for 1/10 second, turn on again for five seconds and then flash the codes that were logged into the memory (if the engine has not been started). The momentary switch (push button) is not needed with engines equipped with Cruise Control. If the engine is not equipped with Cruise Control, then a momentary switch can be installed between connector P1, position H and back to position B.Refer to the section Reading Diagnostic Codes in this publication for additional information.Operation of Engine with Active Diagnostic Codes
If the check engine lamp is ON during normal engine operation, first check to ensure that the engine has the proper oil pressure. If low engine oil pressure occurs, the 3406B PEEC system will limit the maximum engine rpm that can be obtained until the oil pressure problem is corrected.If oil pressure is registering in the normal range, it is permissible to operate the engine. However, the vehicle must be driven to a dealer for maintenance.
If oil pressure is below 15 psi (103 kPa), DO NOT operate the engine. Engine damage can result.
If the 3406B PEEC engine has the proper oil pressure and the check engine light is ON, this indicates that the 3406B PEEC system has identified a malfunction.When the engine speed sensor can no longer sense engine speed (Loss of Engine Speed Signal-Code 34), a shutdown will occur.Limp Home Mode Procedure
Use this procedure to get your vehicle in for service if a Throttle Position Sensor fault (Code 32) occurs.If the engine has proper oil pressure but the engine rpm drops to low idle with no response from the throttle, the Cruise Control SET/RESUME switch can be used to raise engine rpm.Cruise mode