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G258127t5 : CHECK THE IAT SENSOR SENSING CIRCUIT FOR HIGH 1. Disconnect the battery negative terminal. 2. Disconnect the ECM electrical connector, PI01. 3. Disconnect the MAF sensor electrical connector, PI14. 4. Measure the resistance between PI01, pin 71 (U) and PI14, pin 04 (U). Is the resistance greater than 5 ohms? -> Yes REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.
-> No GO to Pinpoint Test G258127t6.
G258127t6 : CHECK THE IAT SENSOR SENSING CIRCUIT FOR SHORT TO 1. Reconnect the battery negative terminal. 2. Turn the ignition switch to the ON position. 3. Measure the voltage between PI14, pin 04 (U) and GROUND. Is the voltage greater than 3 volts? -> Yes REPAIR the short circuit to high voltage. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.
-> No GO to Pinpoint Test G258127t7.
G258127t7 : CHECK THE IAT SENSOR SENSING CIRCUIT FOR SHORT TO 1. Turn the ignition switch to the OFF position. 2. Measure the resistance between PI14, pin 04 (U) and GROUND. Is the resistance less than 10,000 ohms? -> Yes REPAIR the short circuit to GROUND. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.
-> No INSTALL a new MAF sensor. Mass Air Flow (MAF) Sensor (18.30.15) CLEAR the DTC. TEST the system for normal operation. |