Diagnostic Procedure
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Toyota RAV4, 2002 Toyota Highlander, 2002 Toyota Camry, 2002 Lexus RX 300, and 2001 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If Toyota scan tool is not available, begin at step 2.
- Install scan tool to DLC3. Turn ignition on. Monitor PNP switch function. Move the gearshift lever through all gear ranges, while observing the scan tool. See Fig 1. If the readings are within specification, check for intermittent condition: Loose terminal tension, corroded terminals, cut or broken wiring or chaffed wiring harness. If readings are not within specification, go to step 3.
- Turn ignition on. Measure the voltage between terminals "P", "N" R", "D", "2" and "L" of the ECM connector and ground when the gearshift lever is shifted into the positions shown in figure. See Fig 2. If the readings are within specification, check for intermittent condition: Loose terminal tension, corroded terminals, cut or broken wiring or chaffed wiring harness. If readings are not within specification, go to step 3.
- Raise and support vehicle. Remove the PNP switch. Check the continuity between each terminal shown when the gearshift lever is moved into each position. See Fig 3 and Figure . If continuity is within specification, replace the PNP switch. If continuity is not within specification, go to next step.
- Check harness and connector between battery and PNP switch, and PNP switch and ECM. If problem was found, replace wiring harness and connector. If no problem was found, replace ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE.