Troubleshooting .................................................................................................................................. 836 EMISSION AND ELECTRICAL DIAGNOSIS........................................................................................... 838 General Description ............................................................................................................................ 838 Notes for Working on Electrical Items............................................................................................ 838 Symbols and Abbreviations ...........................................................................................................
844 Connector Inspecting Procedure ................................................................................................... 846 Parts for Electrical Circuit............................................................................................................... 847 Diagnosis (4HE1-TC Only) ................................................................................................................. 850 Strategy-based Diagnostics........................................................................................................... 850 General Service Information ..........................................................................................................
851 On-Board Diagnostic (OBD) .......................................................................................................... 851 Reading Diagnostic Trouble Codes Using a Tech 2 or Other Scan Tool....................................... 852 Typical Scan Data Values.............................................................................................................. 856 Troubleshooting ............................................................................................................................. 856 Self-diagnosis Functions................................................................................................................
858 Diagnosis Trouble Code List.......................................................................................................... 860 Location of Sensor and Switch ...................................................................................................... 862 Parts Location................................................................................................................................ 864 Engine Control Module (ECM)....................................................................................................... 865 Chart of Engine Control Module (ECM) Input/Output ....................................................................
866 Location of the Engine Control Module (ECM) Connector............................................................. 868 Location of Data Link Connector (DLC)......................................................................................... 868 Brief Explanation Of Emission And Electrical Control System............................................................ 870 MITICS (Mechanically Integrated Timing and Injection Control System)....................................... 870 Governor (Model RLD-M) ..............................................................................................................
871 EGR (Exhaust Gas Recirculation) System .................................................................................... 872 VSS (Variable Swirl System) ......................................................................................................... 874 Engine Control Module (ECM) System Wiring Diagram ................................................................ 875 Auxiliary Engine Control System.................................................................................................... 876 Vacuum Switching Valve (VSV) Circuit..........................................................................................
878 Exhaust Brake and Engine Warm-up Control................................................................................ 880 DTC-P13 Engine Coolant Temperature (ECT) Sensor Circuit High Voltage................................. 881 DTC-P14 Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage.................................. 885 DTC-P21 Rack Sensor Circuit Low Voltage .................................................................................. 889 DTC-P22 Rack Sensor Circuit High Voltage..................................................................................
892 DTC-P23 Solenoid Switch Control Circuit Low Voltage................................................................. 895 DTC-P24 Solenoid Switch Control Circuit High Voltage................................................................ 899 DTC-P26 Quick Warm System (QWS) Relay Control Circuit High Voltage................................... 903 DTC-P31 Exhaust Gas Recirculation (EGR) Electronic Vacuum Regulating Valve (EVRV) Solenoid Control Low Voltage.......................................................................................................
907 DTC-P32 Exhaust Gas Recirculation (EGR) Electronic Vacuum Regulating Valve (EVRV) Solenoid Control High Voltage...................................................................................................... 910 DTC-P33 Variable Swirl System (VSS) Control Circuit Low Voltage............................................. 913 DTC-P34 Variable Swirl System (VSS) Control Circuit High Voltage............................................ 917 DTC-P35 Exhaust Gas Recirculation (EGR) Quick Cut Vacuum Switching Valve (VSV) Control Circuit Low Voltage ..........................................................................................................
920 DTC-P36 Exhaust Gas Recirculation (EGR) Quick Cut Vacuum Switching Valve (VSV) Control Circuit High Voltage.......................................................................................................... 924 DTC-P41 Quick On Start (QOS) Relay Control Circuit Low Voltage ............................................. 927 DTC-P42 Quick On Start (QOS) Relay Control Circuit High Voltage ............................................ 931 DTC-P43 Aneroid Compensator Vacuum Switching Valve (VSV) Control Circuit Low Voltage .... 935 DTC-P44 Aneroid Compensator Vacuum Switching Valve (VSV) Control Circuit High Voltage ...
939 DTC-P45 Engine Speed Sensor Circuit Low Voltage.................................................................... 943 DTC-P52 Electronically Erasable Programmable Read Only Memory (EEPROM) Error.............. 947 DTC-P61 Barometric Pressure Sensor Circuit Error...................................................................... 947 Without Diagnosis Trouble Code ........................................................................................................ 948 Engine Hunting ..............................................................................................................................
949 Startup Failure ............................................................................................................................... 950 White Smoke (Excessive).............................................................................................................. 952 Black Smoke (Excessive) .............................................................................................................. 954