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.
Tests W/Codes Expand All (for easy ctrl-f) Collapse All Introduction Check Engine Light Retrieving Codes Trouble Code Identification Charts Clearing Codes Diagnostic Charts Diagnostic Circuit Check Chart A-1, No "Check Engine" Light Chart A-2, "Check Engine" Light Won't Flash "On" Steady Chart A-3, Engine Cranks But Will Not Run Chart A-5, Engine Cranks But Will Not Run, (Fuel System Electrical Test) Chart A-7, Fuel System Pressure Test Chart A-9, Cold Start Injector Valve Codes 12 & 13, No Rpm Signal No Signal For 2 Seconds Code 14, Ignition Signal Circuit No Signal Code 21, Oxygen Sensor Circuit Open Or Shorted Circuit Code 22, Coolant Temperature Sensor Circuit Open Code 24, Manifold Air Temperature (Mat) Sensor Circuit Low Temperature Indicated Code 25, Oxygen Sensor Circuit Lean Exhaust Indicated Code 26, Oxygen Sensor Circuit Rich Exhaust Indicated Code 31, Manifold Absolute Pressure Sensor Open Or Shorted Circuit Code 41, Throttle Switch Circuit Code 42, Vehicle Speed Sensor (VSS) Circuit Code 43, No Crank Signal No Signal From Starter Code 51, No A/C Signal Code 71, EGR Gas Temperature Sensor Circuit (CALIFORNIA Only) Summary