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DTC P1178: Air Mass Flow Rate Lean

NOTE: After each repair, clear DTCs. See CLEARING CODES/PCM RESET PROCEDURE  under SELF-DIAGNOSTIC SYSTEM. Turn ignition off and then on. Read DTCs to verify repair is complete. For DLC and PCM connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagrams, see WIRING DIAGRAMS  .

Using scan tool, read DTCs. If DTC P1178 is present, turn ignition off. Inspect intake manifold for air leaks and repair as necessary. If intake manifold system is okay, check for MAF sensor DTCs. Repair as necessary. If MAF DTCs are not present, clear DTCs. Turn ignition off and then on. Read DTCs. If DTC P1178 is not present, repair is complete. If DTC P1178 is present, replace PCM.

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