Park/Neutral Position Switch Circuit
- Ensure starting system is operating normally. Check for starting system problems and repair as necessary. If starting system is okay, go to next step.
- Perform park/neutral position switch test. See CANCEL SWITCHES in CRUISE CONTROL FUNCTION TEST under TROUBLE SHOOTING. If park/neutral position switch input signal is not as specified, go to next step. If park/neutral position switch input signal is as specified, no problem is indicated at this time. Fault may be intermittent. If sent here from SYMPTOM DIAGNOSIS, perform next test listed.
- If TOYOTA HAND-HELD TESTER or equivalent is not available, go to next step. If tester is available, connect to DLC No. 3 located at left side of center console. See Figure. Turn ignition on. Read signals with shift lever in specified positions. See PARK/NEUTRAL POSITION SWITCH table. If scan tool readings are as specified, replace ECM. If scan tool readings are not as specified, go to step 5.PARK/NEUTRAL POSITION SWITCH
Position Signal P & N PNP Off - On R Reverse Off - On D 4TH/Drive Off - On 2 2ND Off - On L Low Off - On - Remove Electronic Control Module (ECM) with connector attached. See Figure. Turn ignition switch to ON position. With shift lever in specified positions, measure voltage (backprobe) between specified terminals. See FigurePARK/NEUTRAL POSITION SWITCH TERMINAL VOLTAGE table. If voltage is as specified, replace ECM. If voltage is not as specified, go to next step.PARK/NEUTRAL POSITION SWITCH TERMINAL VOLTAGE
Position (1) Terminals Voltage P or N All 0 R, D, 2, & L 3 & Ground 9-14 R 6 & Ground 7.5-14 D 25 & Ground 7.5-14 2 5 & Ground 7.5-14 L 4 & Ground 7.5-14 (1) Electronic Control Module (ECM) 28-Pin Harness Connector E12 - Disconnect park/neutral switch harness connector. With shift lever in specified position, check continuity between specified terminals. See Fig 1PARK/NEUTRAL POSITION SWITCH TERMINAL CONTINUITY table. If readings are as specified, go to next step. If readings are not as specified, replace park/neutral switch.PARK/NEUTRAL POSITION SWITCH TERMINAL CONTINUITY
Position Terminals P 1-3 & 6-9 R 2-3 N 3-5 & 6-9 D 3-7 2 3-4 L 3-8 - Check wiring harness and connectors between ECM and park/neutral position switch. Repair as necessary. If wiring harness and connectors are okay, replace ECM and retest system.