Performing Self-Test

To perform self-test, turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tool using the following steps:

• Select VEHICLE & ENGINE SELECTION menu.
• Select NEW VEHICLE, YEAR & MODEL.
• Select DIAGNOSTIC DATA LINK.
• Select POWERTRAIN CONTROL MODULE.
• Select DIAGNOSTIC TEST MODE.
• Select RETRIEVE/CLEAR CONTINUOUS DTCs.
• Turn ignition switch to ON position.
• Follow operating instructions from scan tool menu.
• Record DTCs and perform appropriate system test. See SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE. After continuous memory self-test is complete, cycle ignition switch before performing other self-tests or driving vehicle.

An injector circuit fault can result in unrelated DTCs being received from PCM. If engine idles rough or Continuous Memory DTCs are present, turn ignition switch to ON position. Using scan tool, select INJxF PIDs from PID/DATA MONITOR & RECORD menu. There is one INJxF PID available for each engine cylinder and the "x" indicates the appropriate injector number (1-10). If any PID value indicates YES, an injector fault exists. Turn ignition switch to OFF position and disregard any DTCs that are present at this time. On natural gas models, go to TEST HA, step 60) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE. On all other models, go to TEST H, step 56) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE. If all PID values indicate NO, service DTCs that are present in the following order: KOEO DTCs, KOER DTCs and then continuous memory DTCs. See SELF-DIAGNOSTICS - EEC-V - GASOLINE article in ENGINE PERFORMANCE. After test is complete, cycle ignition switch before performing other self-tests or driving vehicle.