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5. DETECT MALFUNCTIONING PART • Check the following parts: − Relay • Check harness for an open or short between MAF sensor and fuse. • Repair an open circuit or short to ground in harness or connectors. • With the X-431, view DTC in ECM. Is DTC P0102 present? Yes >> Go to the next step. No >> The system is now operating properly. 6. CHECK MAF SENSOR REFERENCE VOLTAGE • Check voltage between MAF sensor terminal 4 and ground in the MAF sensor electrical connector • 5 V should exist. Is the check result normal? Yes >> Go to the next step. No >> Repair the circuit for an open or short to NOTE : The Immobilizer control module must be matched to the new ECM 7. CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT • Turn ignition switch off. • Disconnect ECM harness connector. • Check harness continuity between MAF sensor terminal 3 and ECM terminal 17. • Continuity should exist. • Check harness for short to ground. Is the check result normal? Yes >> Go to the next step. No >> Repair or replace open circuit or short to ground in harness or connectors. 8. CHECK THE MAF SENSOR OUTPUT SIGNAL CIRCUIT FOR AN OPEN OR SHORT • Check harness continuity between MAF sensor terminal 5 and ECM terminal 37. • Continuity should exist. • Check harness for a short to ground or power. Is the check result normal? Yes >> Go to the next step. No >> Repair or replace circuit for an open or short to ground in harness or connectors. DIAGNOSIS & TESTING LTSMD030042 03
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