Diagnosis & Repair
NOTE:
Toyota hand-held tester can be used to confirm PNP switch signal from CURRENT DATA.
- Access ECM behind glove box. See Figure. Turn ignition on. Using DVOM, backprobe and measure voltage between ground and specified terminal at appropriate ECM harness connector. See PARK/NEUTRAL POSITION SWITCH VOLTAGE table. See Figure. If voltage is not as specified, go to next step. If voltage is as specified, no problem is indicated at this time.PARK/NEUTRAL POSITION SWITCH VOLTAGE
Shift Lever Position ECM Terminal No. Volts Park (1) 5 Zero (2) 17 Zero (2) 18 Zero (2) 19 Zero (2) 22 9-14 Reverse (1) 5 Zero (2) 17 (3) 9-14 (2) 18 Zero (2) 19 Zero (2) 22 Zero Neutral (1) 5 Zero (2) 17 Zero (2) 18 Zero (2) 19 Zero (2) 22 Zero Drive (1) 5 9-14 (2) 17 Zero (2) 18 Zero (2) 19 Zero (2) 22 Zero 2 (1) 5 Zero (2) 17 Zero (2) 18 9-14 (2) 19 Zero (2) 22 Zero Low (1) 5 Zero (2) 17 Zero (2) 18 Zero (2) 19 9-14 (2) 22 Zero (1) Measure voltage between ground and terminal listed, at ECM harness connector E7. See Figure. (2) Measure voltage between ground and terminal listed, at ECM harness connector E4. See Figure. (3) Voltage may be slightly less due to lighting of reverse lights. - Turn ignition off. Disconnect PNP switch harness connector. Check continuity between appropriate PNP switch terminals (component side) with shift lever in appropriate position. See PARK/NEUTRAL POSITION SWITCH CONTINUITY table. See Fig 1. If problem does not exist, go to next step. If problem exists, replace PNP switch.PARK/NEUTRAL POSITION SWITCH CONTINUITY
Shift Lever Position Continuity Between Terminals No. Park 3 & 5; 6 & 9 Reverse 2 & 3 Neutral 1 & 3; 6 & 9 Drive 3 & 7 2 3 & 4 Low 3 & 8 - Check wiring between battery and PNP switch. Check wiring between PNP switch and ECM. See WIRING DIAGRAMS article. It may be necessary to consult wiring diagram in appropriate STARTERS article in STARTING & CHARGING SYSTEMS for additional PNP switch wiring. If problem exists, repair wiring as necessary. If problem does not exist, replace ECM.