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Test TC-86A: Speed Control Switch Always High

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.
  1. Using scan tool, read speed control inputs. While observing scan tool display, push speed control ON/OFF switch several times and leave on. If scan tool displays speed control switch on and off, go to TEST TC-86B . If scan tool does not display speed control switch on and off, go to next step.
  2. Disconnect 2-pin speed control ON/OFF switch connector (located behind speed control ON/OFF switch). Using a voltmeter, check voltage of speed control signal circuit on 2-pin speed control switch connector (PCM side). See SPEED CONTROL SWITCH CONNECTOR WIRE IDENTIFICATION  table. If voltage is 4.8 volts or less, go to next step. If voltage is more than 4.8 volts, repair short to voltage on signal circuit. Perform TEST VER-4A .
  3. Turn ignition off. Using an ohmmeter, check resistance of ground circuit on 2-pin speed control switch connector (PCM side). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open ground circuit. Perform TEST VER-4A .
  4. Disconnect Powertrain Control Module (PCM) connector. Using an ohmmeter, check resistance of speed control signal circuit between 2-pin speed control switch connector (PCM side) and PCM connector terminal No. 41. See SPEED CONTROL SWITCH CONNECTOR WIRE IDENTIFICATION  table and PCM CONNECTOR WIRE IDENTIFICATION  table. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, go to step 6)  .
  5. Using an ohmmeter, check resistance across speed control ON/OFF switch terminals. If resistance is less than 25 k/ohms, replace PCM. Perform TEST VER-4A . If resistance is 25 k/ohms or more, replace speed control ON/OFF switch. Perform TEST VER-4A .
  6. Disconnect 4-pin clockspring connector. Using an ohmmeter, check resistance of speed control ON/OFF switch signal circuit between 4-pin clockspring connector and PCM connector terminal No. 41. See CLOCKSPRING CONNECTOR WIRE IDENTIFICATION  table and PCM CONNECTOR WIRE IDENTIFICATION  table. If resistance is less than 5 ohms, repair open signal circuit at clockspring connector. Perform TEST VER-4A . If resistance is 5 ohms or more, repair open signal circuit between 4-pin clockspring connector and PCM connector terminal No. 41. Perform TEST VER-4A .
SPEED CONTROL SWITCH CONNECTOR WIRE IDENTIFICATION

Application Wire Color
Breeze, Cirrus & Stratus
Speed Control Switch Signal Circuit Pink/Light Green
Ground Circuit Black/Light Green
Neon & Sebring Conv.
Speed Control Switch Signal Circuit Red/Light Green
Ground Circuit Black/Light Green
PCM CONNECTOR WIRE IDENTIFICATION

Application Wire Color
PCM Terminal No. 41 (Speed Control Switch Signal Circuit)
Breeze, Cirrus & Stratus Pink/Light Green
Neon & Sebring Conv. Red/Light Green
CLOCKSPRING CONNECTOR WIRE IDENTIFICATION

Application Wire Color
Breeze, Cirrus & Stratus
Speed Control Switch Signal Circuit Pink/Light Green
Neon & Sebring Conv.
Speed Control Switch Signal Circuit Red/Light Green
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