Diagnostic Test Charts

Following are 6 different diagnostic test flow charts, providing the shortest means of testing the system. These include:

• Ignition Switch "OFF" Chart  Tests system power for ECU memory keep-alive voltage.
• Ignition Switch "ON" Power Chart  Tests system power function and fuel pump power function.
• Ignition Switch "ON" Input Chart  Tests closed throttle (idle) switch, wide open throttle (WOT) switch, manifold absolute pressure (MAP) sensor, park/neutral switch, coolant temperature sensor (CTS), manifold air/fuel temperature (MAT) sensor and the respective switch or sensor circuits.
• System Operational Chart  Tests engine start-up and fuel injector circuits, plus function of closed loop air/fuel mixture, coolant temperature sensor, manifold air/fuel temperature sensor, knock sensor and closed loop ignition retard/advance, EGR valve and canister purge solenoid, idle speed actuator, and A/C control.
• Basic Engine Chart  Indicates possible failures within other engine related components.
• Man. Trans. Up-shift Chart  Tests up-shift indicator lamp function on manual transmission vehicles.