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Testing Procedure

To ensure correct diagnosis and repair, testing should be done in the following order:

  1. Get information about conditions present when malfunction occurred. Retrieve and record DTCs and freeze-frame data. See RETRIEVING DIAGNOSTIC TROUBLE CODES . If MIL is on, and DTCs are not accessible, check for ECM fail-safe mode. See FAIL-SAFE MODES . If symptoms exist, but DTCs or freeze-frame data do not exist, go to next step. If symptoms do not exist, but DTCs or freeze-frame data exist, go to step  3.
  2. Attempt to duplicate conditions present when malfunction occurred. If malfunction is detected, perform basic inspection. See ON-VEHICLE ADJUSTMENTS article. Then go to diagnosis by SYMPTOMS in TROUBLESHOOTING - NO CODES article. If malfunction can not be verified, problem may be intermittent. See INTERMITTENTS in TROUBLESHOOTING - NO CODES article.
  3. Clear DTCs and freeze-frame data. See CLEARING DIAGNOSTIC TROUBLE CODES . Attempt to reset DTC by performing DTC CONFIRMATION TEST in appropriate DTC diagnostic test. If multiple DTCs are present, diagnose in order of priority. See MULTIPLE DTC PRIORITY IDENTIFICATION . If DTC does not reset, problem may be intermittent. See INTERMITTENTS in TROUBLESHOOTING - NO CODES article. If DTC resets, go to next step.
  4. Perform appropriate diagnostic procedure. See appropriate test under DIAGNOSTIC TESTS. After repairs are made, perform appropriate DTC CONFIRMATION TEST to verify repair. Clear DTCs. If SRT codes are not set, drive vehicle in specified driving pattern to set all SRT codes. See SYSTEM READINESS TEST .
MULTIPLE DTC PRIORITY IDENTIFICATION (1)

Priority DTC
1 P0101, P0102, P0103, P0112, P0113, P0117, P0118, P0128, P0181, P0182, P0183, P0221, P0222, P0223, P0226, P0227, P0228, P0327, P0328, P0335, P0340, P0460, P0461, P0462, P0463, P0464, P0500, P0605, P1223, P1224, P1225, P1226, P1227, P1228, P1229, P1464, P1706, U1000 & U1001
2 P0031, P0032, P0037, P0038, P0132, P0133, P0134, P0138, P0139, P0217, P0441, P0444, P0445, P0447, P0452, P0453, P0506, P0507, P0650, P0710, P0720, P0725, P0740, P0750, P1065, P1111, P1122, P1124, P1126, P1143, P1144, P1146, P1147, P1444, P1446, P1448, P1490, P1491, P1705, P1760 & P1805
3 P0011, P0171, P0172, P0300, P0301, P0302, P0303, P0304, P0420, P0442, P0455, P0456, P0705-P0725, P0740-P0755, P1121, P1148, P1217, P1456, P1564, P1572 & P1574
(1) If DTC U1000 or DTC U1000 is present, perform diagnosis for DTC U1000 or DTC U1001 first.
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