Diagnosis & Repair
WARNING: This page is about a different car, the 2000 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Toyota hand-held tester can be used to confirm PNP switch signal from CURRENT DATA.
- Access ECM below stereo, behind instrument panel, just in front of center console. Turn ignition on. Using DVOM, backprobe and measure voltage between ground and specified terminal at ECM harness connector E9. See PARK/NEUTRAL POSITION SWITCH VOLTAGE table. See Figure. If voltage is as specified, no problem is indicated at this time. If voltage is not as specified, go to next step.PARK/NEUTRAL POSITION SWITCH VOLTAGE
Shift Lever Position (1) Terminal No. Volts Park & Neutral 2 Zero 3 Zero 12 Zero 13 Zero Reverse 2 (2) 9-14 3 Zero 12 Zero 13 (2) 9-14 Drive 2 Zero 3 Zero 12 Zero 13 9-14 2 2 Zero 3 9-14 12 Zero 13 9-14 Low 2 Zero 3 Zero 12 9-14 13 9-14 (1) Measure voltage between ground and terminal listed, at ECM harness connector E9. See Figure. (2) Voltage may be slightly less due to lighting of reverse lights. - 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 exists, replace PNP switch. If problem does not exist, go to next step.PARK/NEUTRAL POSITION SWITCH CONTINUITY
Shift Lever Position Continuity Between Terminals No. Park 1 & 3; 6 & 9 Reverse 2 & 3 Neutral 3 & 5; 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. If problem exists, repair wiring as necessary. If problem does not exist, replace ECM.