Diagnosis & Repair
NOTE:
Toyota hand-held tester can be used to confirm PNP switch signal from CURRENT DATA.
- Access ECM behind bottom center of instrument panel, in front of console. Turn ignition on. Using DVOM, backprobe and measure voltage between ground and specified terminal at ECM harness connector E6. See PARK/NEUTRAL POSITION SWITCH VOLTAGE table. See Figure. If voltage is as specified, replace ECM. If voltage is not as specified, go to next step.PARK/NEUTRAL POSITION SWITCH VOLTAGE
Shift Lever Position (1) Terminal No. Volts Park & Neutral 8 Zero 18 Zero 19 Zero 22 Zero Reverse 8 (2) 10-14 18 Zero 19 Zero 22 (2) 10-14 Drive 8 Zero 18 Zero 19 Zero 22 10-14 2 8 Zero 18 10-14 19 Zero 22 10-14 Low 8 Zero 18 Zero 19 10-14 22 10-14 (1) Measure voltage between ground and terminal listed, at ECM harness connector E6. See Figure. (2) Voltage may be slightly less due to lighting of reverse lights. - 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 2 & 7; 5 & 6 Reverse 2 & 8 Neutral 2 & 9; 5 & 6 Drive 2 & 10 2 2 & 3 Low 2 & 4 - Check wiring between battery and PNP switch and between PNP switch and ECM. See WIRING DIAGRAMS article. If problem exists, repair wiring as necessary. If problem does not exist, replace ECM.