Transmission Controls With PCM

PCM/TC DTC/information flag 18 is set when all forward gears are indicated as not available. DTC/information flag 18 is an indicator that all gears are being affected by the same condition.

DTC/INFORMATION FLAG PARAMETERS
^ Vehicle speed is zero.

^ Steady moderate throttle.

^ Turbine speed above 756 rpm.

^ The PCM commanding 1st, 2nd, 3rd, or 4th gears results in no accurate turbine speed pull down.

^ Speed ratio across the torque converter is greater than 180 (no torque).
Speed ratio of 255 = TCC applied and engine speed equal to turbine speed.

TEST DESCRIPTION
^ Check for DTC/information flag 14. If present, repair first and road test the vehicle.
If no diagnostic trouble codes are present then check the following items:
^ Selector switch failed or the harness was wired incorrectly.

^ Transaxle may be hydraulically in neutral and selector switch indicates a forward gear.

^ Shift cable misadjusted.

^ Manual valve disconnected.

^ Verify VSS/TSS using scan tool.