DRIVEABILITY Test No 7 - Throttle Position Sensor Circuit (Code 24)

1. With tester connected to diagnostic connector and TPS sensor disconnected, put system in Sensor Test "05". Refer to ENTERING ON-BOARD DIAGNOSTICS  in this article. If display on tester reads between 4-5 volts, go to next step. If display on tester reads zero volts, replace SMEC for a bad logic board. Before replacing SMEC, ensure Orange/Dk. Blue wire at cavity No. 22 of 60-pin connector is not shorted to ground.
   Fig 1: Throttle Position Sensor (TPS) Connector

   
2. Connect a jumper wire between Orange/Dk. Blue and Black/Lt. Blue wire terminals of TPS connector. If display on tester reads zero volts, go to step 4). If display on tester reads 5 volts, go to next step.
   Fig 2: Jumper Connection on Throttle Position Sensor (TPS) Connector

   
3. Connect one end of a jumper wire to ground. Connect other end of wire to Orange/Dk. Blue wire terminal of TPS harness connector. If display on tester reads zero volts, repair Black/Lt. Blue wire of TPS connector for an open circuit to wiring harness splice. If display on tester reads 5 volts, repair Orange/Dk. Blue wire of TPS connector for an open circuit to SMEC.
   Fig 3: Grounding Jumper on Throttle Position Sensor (TPS) Connector

   
4. Turn ignition switch to "RUN" position. Connect a digital voltmeter between Violet/White wire of TPS harness connector and ground. If voltmeter reads at least 4 volts, replace TPS. If voltmeter reads zero volts, repair Violet/White wire for an open circuit to wiring harness splice.

Fig 4: Voltmeter Connection on Throttle Position Sensor (TPS) Connector