Symptom Troubleshooting Chart - Automatic Transmission External Controls

SYMPTOM TROUBLESHOOTING CHART - AUTOMATIC TRANSMISSION EXTERNAL CONTROLS

Problem	Possible Cause	Action
Shift interlock system does not release/lock properly	Clutch pedal position (CPP) switch connector jumper missing or incorrectly installed. Circuit(s) Fuse(s) Shift lock actuator Brake pedal position (BPP) switch	See AUTOMATIC TRANSMISSION EXTERNAL CONTROLS PINPOINT TEST 1: SHIFT INTERLOCK SYSTEM DOES NOT RELEASE / LOCK PROPERLY , .
Shift control is out of proper gear relationship	Transmission shift cable and bracket Retainer bracket Shift control linkage	See AUTOMATIC TRANSMISSION EXTERNAL CONTROLS PINPOINT TEST 2: SHIFT CONTROL IS OUT OF PROPER GEAR RELATIONSHIP , .
Transmission range indicator does not correspond to the gear	Transmission shift cable bracket	Tighten bolts holding transmission shift cable bracket. See SHIFT CABLE AND BRACKET ADJUSTMENT .
	Transmission control indicator linkage	Adjust PRNDL at the steering housing. See SHIFT INDICATOR CABLE AND BRACKET ADJUSTMENT .
	Transmission shift cable loose from the transmission retainer bracket	Reinstall transmission shift cable into bracket. Replace if damaged. See SHIFT CABLE AND BRACKET REMOVAL / INSTALLATION .
	Shift linkage	Verify the transmission shift cable adjustment. Adjust the transmission shift cable if necessary. See SHIFT CABLE AND BRACKET ADJUSTMENT . Verify digital transmission range (DTR) sensor for proper adjustment. See DIGITAL TRANSMISSION RANGE SENSOR REMOVAL / INSTALLATION , .
	Clip securing the transmission shift cable to the shift control selector lever	Install the clip properly.
Transmission range indicator lamp does not illuminate	Bulb Circuits)	See SYMPTOM TROUBLESHOOTING CHART - INSTRUMENT CLUSTER AND PANEL ILLUMINATION , .
Transmission Control (OD ON/OFF) switch (TCS) inoperative	Blown fuse Damaged TCS or TCS not cycled during self test Damaged powertrain control module (PCM) Circuitry open/shorted	See TRANSMISSION CONTROL SWITCH (TCS) REMOVAL / INSTALLATION . See AUTOMATIC TRANSMISSION EXTERNAL CONTROLS PINPOINT TEST 3: THE TRANSMISSION CONTROL SWITCH (OVER-DRIVE OD, ON/OFF) IS NOT OPERATING PROPERLY , .
Transmission control (OD ON/OFF) indicator lamp (TCIL) does not illuminate	Bumed out bulb Circuitry open/shorted Damaged powertrain control module	See AUTOMATIC TRANSMISSION EXTERNAL CONTROLS PINPOINT TEST 4: TRANSMISSION CONTROL INDICATOR LAMP (TCIL) (OVER-DRIVE OD, ON/OFF) DOES NOT ILLUMINATE , .
Transmission control (OD ON/OFF) indicator lamp (TCIL) stays illuminated	Circuitry open/shorted Damaged powertrain control module	See AUTOMATIC TRANSMISSION EXTERNAL CONTROLS PINPOINT TEST 5: TRANSMISSION CONTROL INDICATOR LAMP (TCIL) STAYS ILLUMINATED , .