Test H: Speed Control Is Inoperative
CAUTION:
When battery is disconnected, vehicle computer and memory system may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.
- Turn ignition switch to LOCK position. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). DLC is located below left side of instrument panel, to right of steering column. Monitor Powertrain Control Module (PCM) PID IDBRKSW. If PID indicates ON, go to next step. If PID indicates OFF, go to step 3 .
- Turn ignition switch to LOCK position. Disconnect PCM 58-pin harness connector C175a. PCM is located at rear of engine on passenger's side. See Figure . Measure voltage between ground and PCM harness connector C175a terminal No. 40 (Orange wire). See Figure . If any voltage is present, repair short to voltage in brake light circuit. See AUTOLAMP SYSTEMS - LS article. If no voltage is present, replace PCM.
- Monitor PCM PID PBA_SW. If PID indicates OFF when parking brake is released, go to next step (manual transmission) or step 8 (automatic transmission). If PID indicates ON, repair instrument panel concern. See ANALOG INSTRUMENT PANELS - LS article.
- Monitor PCM PID CPP. If PID indicates YES, go to next step. If PID indicates NO, go to step 11 .
- Turn ignition switch to LOCK position. Disconnect Clutch Pedal Position (CPP) switch harness connector C258. Measure resistance between CPP switch terminals No. 1 and 3 (component side) while depressing and releasing clutch pedal. See Fig 1 . Resistance reading should be less than 5 ohms in one position and more than 10 k/ohms in the other position. If resistance are as specified, go to next step. If resistance readings are not as specified, replace CPP.
- Disconnect PCM 32-pin harness connector. PCM is located at rear of engine on passenger's side. See Figure . Measure resistance in White wire between CPP switch harness connector C258 terminal No. 1 and PCM harness connector C175b terminal No. 22. See Fig 2 and Fig 3 . Measure resistance between ground and CPP switch harness connector C258 terminal No. 1 (White wire). Resistance should be less than 5 ohms between CPP switch and PCM, and more than 10 k/ohms between ground and CPP switch. If resistances are as specified, go to next step. If any resistance is not as specified, repair open and/or short to ground in White wire between CCP an PCM. See WIRING DIAGRAMS .
- Measure resistance in Brown wire between CPP switch harness connector C258 terminal No. 3 and PCM 58-pin harness connector C175a terminal No. 17. See Figure and Fig 2 . Measure resistance between ground and CPP switch harness connector C258 terminal No. 3 (Brown wire). Resistance should be less than 5 ohms between CPP switch and PCM, and more than 10 k/ohms between ground and CPP switch. If resistances are as specified, go to next step. If any resistance is not as specified, repair open and/or short to ground in Brown wire between CCP and PCM.
- Disconnect Digital Transmission Range (DTR) sensor harness connector C167. Measure resistance between DTR sensor terminals No. 2 and 4 (component side) while placing transmission selector in "P" and "D5". See Fig 4 . Resistance should be less than 5 ohms when transmission selector is in "P" and more than 10 k/ohms in "D5". If resistances are as specified, go to next step. If resistance is not as specified, replace DTR sensor.
- Measure resistance in White/Green wire between DTR switch harness connector C167 terminal No. 4 and PCM harness connector C175b terminal No. 22. Measure resistance between ground and DTR switch harness connector C167 terminal No. 4 (White/Green wire). Resistance should be less than 5 ohms between DTR switch and PCM, and more than 10 k/ohms between DTR switch and ground. If resistances are as specified, go to next step. If any resistance is not as specified, repair open and/or short to ground in White/Green wire between DTR switch and PCM.
- Measure resistance in Brown/Red wire between DTR switch harness connector C167 terminal No. 2 and PCM 58-pin harness connector C175a terminal No. 17. Measure resistance between ground and DTR switch harness connector C167 terminal No. 2 (Brown/Red wire). Resistance should be less than 5 ohms between DTR switch and PCM, and more than 10 k/ohms between DTR switch and ground. If resistances are as specified, go to next step. If any resistance is not as specified, repair open and/or short to ground in Brown/Red wire between DTR sensor and PCM.
- Connect all disconnected components. Monitor PCM PID SCCS while pressing and releasing speed control switches. If PID agrees with control switch position, go to next step. If PID does not agree with control switch position, replace speed control switch.
- Monitor PCM PID VBAT. If PID indicates more than 10 volts with engine running, repair engine performance concern. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If PID indicates less than 10 volts with engine running, repair charging system concern. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.