October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.
Engine Controls - Tests W/Codes - Diesel Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Diagnostic Procedure Entering Or Exiting Diagnostic Mode Trouble Code Identification ECM Location Diagnostic Charts Notes Diagnostic Circuit Check Service Engine Soon Light Inoperative ECM Check, Service Engine Soon Light On At All Times Or Won't Flash Code 12 EPR Solenoid Electrical Check EPR Vacuum Circuit Check Code 12, No Reference Pulse Code 14, Coolant Temp Sensor Signal Voltage Low Code 15, Coolant Temp Sensor Signal Voltage High Code 21, Throttle Position Sensor Signal Voltage High Code 22, Throttle Position Sensor Signal Voltage Low Code 23, Throttle Position Sensor MISADJUSTED Code 24, Vehicle Speed Sensor Circuit Code 31, Manifold Absolute Pressure Sensor Signal Voltage Low Code 32, EGR Circuit Loop Error Code 33, Map Sensor Signal Voltage High Code 51, Prom Problem Code 52, ECM Fault Code 53, Voltage Reference Overload