Qt1 Carry Out The Pcm Quick Test

NOTE: If the vehicle was brought in with an emission compliance concern, GO to PINPOINT TEST EM: EMISSION COMPLIANCE .

NOTE: For applications that use a stand-alone transmission control module (TCM), the PCM does not output TCM related diagnostic trouble codes (DTCs). Refer to the appropriate AUTOMATIC TRANSMISSION article for diagnosis and testing.

NOTE: If unable to access the PCM DTCs, or a diagnostic tool communication concern exists, GO to Pinpoint Test PINPOINT TEST QA: UNABLE TO ACTIVATE SELF-TEST/NETWORK COMMUNICATION ERROR . For additional information on retrieving malfunction indicator lamp (MIL) and non-MIL DTCs, refer to Diagnostic Methods article CONTINUOUS MEMORY SELF-TEST .

Complete the preliminary checks looking for obvious concerns that may relate to the symptom. Check for the following items:
- related electrical connectors or fuses
- vacuum lines (leaks, routing)
- air intake system (leaks, restrictions)
- fuel quality (octane, contamination, winter/summer blend)
- cooling system (engine operating at proper temperature)
Access any related Technical Service Bulletin (TSB) information (if available).
Carry out the PCM self-test to access any DTCs. Record any key on engine off (KOEO), key on engine running (KOER) (if the engine runs) and continuous memory (MIL and non-MIL) DTCs.

Are any DTCs present?

Yes	No
GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS for direction to repair DTCs after noting the following: Diagnose DTCs in the following order (begin diagnosis with the first DTC output in that mode and diagnose any circuit related DTCs first). For multiple circuit DTCs that are set as a result of a concern with more than one component, REFER to SYSTEM WIRING DIAGRAMS and identify the common cause such as SIG RTN, VREF, or VPWR. Continue DTC diagnosis by referring to the appropriately identified pinpoint test. Any KOEO self-test DTCs Any KOER self-test DTCs Any continuous memory self-test DTCs. Retrieve any available freeze frame data and disregard any identical/related continuous DTCs already repaired.	GO to STEP 2: NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX for direction to the proper symptom chart in STEP 3: NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHARTS . If the symptom is not listed, REFER to the applicable service information article.

Yes

GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS for direction to repair DTCs after noting the following:
Diagnose DTCs in the following order (begin diagnosis with the first DTC output in that mode and diagnose any circuit related DTCs first). For multiple circuit DTCs that are set as a result of a concern with more than one component, REFER to SYSTEM WIRING DIAGRAMS and identify the common cause such as SIG RTN, VREF, or VPWR. Continue DTC diagnosis by referring to the appropriately identified pinpoint test.

Any KOEO self-test DTCs
Any KOER self-test DTCs
Any continuous memory self-test DTCs. Retrieve any available freeze frame data and disregard any identical/related continuous DTCs already repaired.

GO to STEP 2: NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX for direction to the proper symptom chart in STEP 3: NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHARTS .
If the symptom is not listed, REFER to the applicable service information article.