- 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 |
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 |
- 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 |
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- 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.