Diagnosis & Repair

NOTE: Toyota hand-held tester can be used to confirm PNP switch signal from CURRENT DATA.

Access ECM behind glove box. See Figure. Turn ignition on. Using DVOM, backprobe ECM harness connector and measure voltage between ground and specified terminal at appropriate ECM harness connector with shift lever in appropriate position. See PARK/NEUTRAL POSITION SWITCH VOLTAGE table. See Figure. If voltage is not as specified, go to next step. If voltage is as specified, replace ECM.

PARK/NEUTRAL POSITION SWITCH VOLTAGE

Shift Lever Position

Terminal No.

Volts

Park & Neutral

⁽¹⁾ 1

Zero

⁽¹⁾ 2

Zero

⁽¹⁾ 3

Zero

⁽¹⁾ 8

Zero

⁽²⁾ 2

Zero

Reverse

⁽¹⁾ 1

Zero

⁽¹⁾ 2

Zero

⁽¹⁾ 3

⁽³⁾ 7.5-14

⁽¹⁾ 8

Zero

⁽²⁾ 2

⁽³⁾ 9-14

Drive

⁽¹⁾ 1

Zero

⁽¹⁾ 2

Zero

⁽¹⁾ 3

Zero

⁽¹⁾ 8

7.5-14

⁽²⁾ 2

9-14

⁽¹⁾ 1

Zero

⁽¹⁾ 2

7.5-14

⁽¹⁾ 3

Zero

⁽¹⁾ 8

Zero

⁽²⁾ 2

9-14

Low

⁽¹⁾ 1

7.5-14

⁽¹⁾ 2

Zero

⁽¹⁾ 3

Zero

⁽¹⁾ 8

Zero

⁽²⁾ 2

9-14

⁽¹⁾	Terminals are located in ECM harness connector E8.See Figure.

⁽²⁾	Terminals are located in ECM harness connector E9.See Figure.

⁽³⁾	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 does not exist, go to next step. If problem exists, replace PNP switch.

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 Park/Neutral Position Switch Terminals