Diagnostic Aids

Any condition that can cause the MAF, MAP, SCIP, and TP sensors to be shifted in value or any condition that may cause the by-pass valve to stick, at the same time may cause this DTC to set.
A slight to moderate resistance of 10-20 ohms on the ignition or ground circuits may cause this DTC to set.

CAUTION: Refer to Road Test Caution .

Road test the vehicle and verify that the MAF sensor calculated g/s and the actual MAF g/s parameters are near or equal to each other.
A skewed MAF sensor, intake air flow restriction or intake air flow leak after the MAF sensor may cause the calculated g/s and MAF g/s parameters to disagree. Road test the vehicle while observing both parameters under various engine loads.
A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 6-10 g/s at idle to 380 g/s or more at the time of the 2-3 shift.
A steady or intermittent high resistance of 15 ohms or more on the ignition 1 voltage circuit will cause the MAF sensor values to be skewed high by up to 60 g/s.
A skewed or stuck ECT or IAT sensor 1 will cause the calculated models to be inaccurate and may cause this DTC to run when it should not. Refer to Temperature Versus Resistance .