P091

Code Chart P091:

Transaxle Range Switch Circuit:

DESCRIPTION
This diagnostic monitors the Park/Neutral input from the transaxle range switch to the PCM (PD72). The transaxle range switch also sends information relative to gear selection to the instrument panel cluster (ID41). The PCM compares the two decoded signals and if the PCM detects a fault in one of the decoded signals or the engine starts with no Park/Neutral input or if the vehicle is in forth gear and engine speed divided by vehicle speed is between 23 rpm/mph, and the Park/Neutral input indicates Park/Neutral code P091, then code I027 will set.

TEST CONDITIONS
Test continuously.

FAILURE CONDITIONS
Park/Neutral input and Park/Neutral indication from IPC are not the same.
OR
Engine starts with no Park/Neutral input.
OR
PRNDL indication from IPC is illegal (refer to IPC code I027 for illegal PRNDL indications).
OR
Vehicle is in fourth gear, engine speed divided by vehicle speed is between 23 rpm/mph and 35 rpm/mph, and the P/N input indicates in P/N.

ACTION TAKEN
1. PCM turns "ON" the "SERVICE VEHICLE SOON" Malfunction Indicator Lamp (MIL).
2. PCM disables cruise control.