Diagnosis & Repair
WARNING: This page is about a different car, the 2003 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect park/neutral position switch 9-pin connector. See Fig 1. Check continuity between each terminal when shift lever is moved to each position. See PARK/NEUTRAL POSITION SWITCH CONTINUITY CHECK table. If continuity is to specification, go to next step. If continuity is not to specification, replace park/neutral position switch.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
PARK/NEUTRAL POSITION SWITCH CONTINUITY CHECKShift Lever Position Continuity Between Terminals No. P 1-3, 6-9 R 2-3 N 3-5, 6-9 D, 4 3-7 3 3-4 2, L 3-8 - Reconnect park/neutral position switch connector. Disconnect shift lock control unit assembly 10-pin connector. See Fig 2. Check continuity between each terminal when shift lever is moved to each position. See SHIFT LOCK CONTROL ECU SUB-ASSEMBLY table. If continuity is present, go to next step. If continuity is not present, replace shift lock control ECU sub-assembly.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
SHIFT LOCK CONTROL ECU SUB-ASSEMBLYShift Position Tester Connection Specified Value D 2-10 (AT4-NSSD) No Continuity 4 2-10 (AT4-NSSD) Continuity 2 3-6 (NSSL-ATL) No Continuity L 3-6 (NSSL-ATL) Continuity - Reconnect shift lock control unit assembly connector. Disconnect ECM connectors. Turn ignition switch ON and measure voltage between terminals P, R, N, D, 4, 3, 2, and L of ECM and terminal E1 when shift lever is shifted to specified position. See Fig 3. See PARK/NEUTRAL POSITION SWITCH/ECM VOLTAGE CHECK table. Ensure battery voltage is present at each terminal. If voltage is to specification, replace ECM. If voltage is not to specification, repair or replace harness or connector.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
PARK/NEUTRAL POSITION SWITCH/ECM VOLTAGE CHECKShift Lever Position ECM Terminal P P-E1 N N-E1 R R-E1 D, 4 D-E1 4 4-E1 3 3-E1 2, L 2-E1 L L-E1