Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Toyota Highlander. 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.

Connect scan tool to Data Link Connector (DLC) No. 3. See Figure. Using scan tool, monitor gear position while shifting transmission through all gears. If scan tool display agrees with gear position, replace ECM. If scan tool display does not agree with gear position, go to next step.

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 and 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.

Fig 1: Identifying PNP Switch Terminals (Component Side)