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Using The ECAP Or DDT To Display ACTIVE Codes:
A. With key OFF, install an ECAP or DDT into the 3176 System.B. Turn key ON (engine does not need to be started to view codes).C. Refer to the Operating Manual and Special Instructions for the service tool being used (listed under 3176 Service Tools) to read the diagnostic code(s). On the ECAP, the display menu will direct you to the correct screen to display diagnostic messages.Using The Diagnostic Switch To Display ACTIVE Codes:
A. Turn key ON (engine does not need to be started to view codes).B. The Diagnostic Lamp will turn ON for five seconds, blink OFF, turn ON again for five seconds, then OFF for five seconds. At the end of that time, the lamp will begin to flash the first number of the two-digit code (count the flashes). After two seconds OFF, it will begin to flash the second digit. If two or more codes are present, they will follow the first after a few seconds and be displayed in the same manner.C. Active Diagnostic codes may be displayed at any time by using the Diagnostic Switch. With key ON or engine running, depress the diagnostic switch. Once the code(s) begin to flash, the diagnostic switch may be released.The Diagnostic Lamp will flash out all codes that are currently ACTIVE or that have been ACTIVE since the key was turned ON.LOGGED Diagnostic Codes
When the ECM generates a diagnostic code, it usually logs the code in permanent memory within the ECM. The ECM has an internal diagnostic clock and will record the hour of the first occurrence, the hour of the last occurrence and the number of occurrences of the code. Knowing when and how often the code was generated can be a valuable indicator when troubleshooting intermittent problems. Logged codes can be retrieved or erased using an ECAP or DDT Electronic Service Tool.Those logged diagnostic codes which do not require passwords to clear, will automatically be deleted if no additional occurrences are recorded in 500 hours.When investigating LOGGED Diagnostic Codes, keep in mind:* Some codes can be sensitive and may log occurrences that did not result in operator complaints. If the time the code was logged does NOT correlate to a complaint, there may be nothing to fix.* The most likely cause of an Intermittent Problem is a faulty connection or damaged wiring. Next likely is a component failure (sensor or switch for instance). Least likely is failure of the ECM itself.* One code represents an "event", not a failure. This is Diagnostic Code 35 (Engine Overspeed). Factory passwords are required to clear this code from the log.* Diagnostic Codes that are logged repeatedly may indicate a problem that needs special investigation. Codes that are logged only a few times and do not result in operator complaints, may not need repair.To troubleshoot a Logged Diagnostic Code, first refer to the procedure in this section for troubleshooting the specific CODE. If symptoms continue, use the procedure for troubleshooting SYMPTOMS (see Section 4, Troubleshooting Without A Diagnostic Code).Always clear LOGGED codes after investigating and correcting the problem which generated the code.Diagnostic Code 25 Boost Pressure Sensor Fault
Conditions Which Generate This Code:The Electronic Control Module (ECM) detects a boost pressure sensor signal voltage below 0.3 volts or above 4.7 volts DC for at least a 1/4 of a second. System Response:1. The code is current (Diagnostic Lamp, ECAP, or DDT) and is LOGGED in memory.2. Boost pressure is artificially set to 0 kPa (0 psi) by the ECM, regardless of actual boost pressure at the time. This will limit fuel delivery rate, which in turn limits horsepower. Troubleshooting:Follow P-225: Boost Pressure Sensor Test, in this manual.Diagnostic Code 27 Coolant Temperature Sensor Fault
Conditions Which Generate This Code:The Electronic Control Module (ECM) detects a Coolant Temperature Sensor signal voltage below 0.3 volts DC or above 4.7 volts DC for at least 1/4 of a second. System Response:1. The coolant temperature is artificially set to 32.2° C (90° F) by the ECM, which takes the system out of Cold Mode.2. The code is current (Diagnostic Lamp, ECAP, or DDT) and is LOGGED in memory. Troubleshooting:Follow P-224: Coolant Temperature Sensor Test in this manual.Diagnostic Code 28 Check Throttle Position Sensor Adjustment
Conditions Which Generate This Code:The ECM reads a throttle position signal with a DUTY CYCLE above 95% or below 5% for four seconds. "Duty Cycle" may be read with an Electronic Control Analyzer and Programmer (ECAP) or Digital Diagnostic Tool (DDT), using the Pulse Width Monitor and Probe. The "Duty Cycle" reading must not be confused with the "Throttle Position" reading. "Throttle Position" is the data after being processed within the Electronic Control Module (ECM). Both are read in percent, but "Duty Cycle" (or pulse width) is the raw data from the sensor. DUTY CYCLE MUST BE USED WHEN TESTING OR ADJUSTING THE THROTTLE POSITION SENSOR. System Response:1. The code is current (Diagnostic Lamp, ECAP, or DDT) and is LOGGED in memory. Troubleshooting:Check throttle and linkage for damage. If no damage is found, refer to P-303: Throttle Position Sensor Adjustment, in this manual.Diagnostic Code 32 Throttle Position Sensor Fault
Conditions Which Generate This Code:1. The Electronic Control Module (ECM) has not received a Throttle Position Signal for at least two seconds. System Response:1. Diagnostic Code 32 is current (Diagnostic Lamp, ECAP, and DDT). It is LOGGED in memory only if the engine is running. -AND-2. The "Throttle Position" is set to zero and the ECM will not respond to changes in the Throttle Position Sensor setting. Troubleshooting:Follow P-211: Throttle Position Sensor Test, in this manual.Diagnostic Code 34 Loss Of Engine RPM Signal
It is NORMAL to get a Diagnostic Code 34 with the key ON and engine OFF. The code will not be logged into memory in this condition. Conditions Which Generate This Code:1. If the Speed/Timing Sensor output does not show the correct 24-tooth pattern from the Timing Reference Ring -OR-2. The engine was running and the Engine Speed Signal suddenly dropped near zero, (without