DRIVEABILITY TROUBLESHOOTING
Below is a comprehensive list of the frequently asked questions we receive via our email contact form.

NO MAF READING (0V) AND THE VEHICLE RUNS GOOD WITH MAF PLUGGED IN AND UNPLUGGED?
•    Check MAF fuse. If fuse is good, check that the MAF you are using is wired correctly for the harness you ordered.

DTC P0102 (LOW FREQUENCY MAF) VEHICLE RUNS BAD WITH MAF PLUGGED IN BUT RUNS GOOD WITH MAF UNPLUGGED?
•    Check that MAF you are using is wired correctly for the harness you ordered.

NO THROTTLE RESPONSE WITH DBW VEHICLE?

•    GM drive by wire (DBW) systems require that components integral to the system (Pedal, Throttle Body, Throttle Actuator Control Module (Gen III applications only)) are matched to work together. This includes the tune which must have the correct programming to match your throttle components as well. If these steps are not followed a lack of throttle response may ensue.
•    Check brake switch wiring.
•    Call PSI Tech Support with further questions.

FUEL PUMP RELAY WON’T RESPOND/CONSTANTLY CLICKING?
•    This relay is grounded in by the PCM wiring harness grounding lugs. Check that the lugs are tightened the rear of the driver’s cylinder head and that the surface on the engine is clean. Also ensure that the battery, engine and vehicle are grounded properly. Reference the PSI Engine Ground Diagram.
•    If Grounding checks out, contact PSI to ensure that the tune is set for ‘Constant’ fuel pump signal and not ‘PWM’ signal.
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