Throttle Position Sensor

NOTE: Enter this test only when a Code 12 is displayed during QUICK TESTS procedure or when directed here from another PINPOINT TEST.

Fig 1: Identifying TP Circuits (TP)

TP CIRCUIT PIN IDENTIFICATION

Circuit	PCM Pin	BOB Pin	Wire Color
IDL	1E	28	GRN/ORG
SIGRTN	2C	46, 49	BLU/YEL
TP	2G	47	ORG
VREF	2A	26	WHT/BLK

1) Turn ignition off. Install BOB. Turn ignition on. Measure voltage between BOB test pins TP and SIGRTN while opening throttle. Compare voltage to specification in appropriate TP SENSOR OUTPUT VOLTAGE table. If output voltage is not within specification, go to next step.

TP SENSOR OUTPUT VOLTAGE

Throttle Opening

⁽¹⁾ Voltage

1/8

1.00

1/4

1.60

3/8

2.37

1/2

2.74

5/8

3.15

3/4

3.43

7/8

3.60

Full Open

4.02

⁽¹⁾	Voltage may differ by 15 percent.

2) Turn ignition off. Unplug TP sensor connector at throttle body. Turn ignition on. Measure voltage between VREF wire on TP harness connector and ground. If voltage is 4-5 volts, go to next step. If voltage is not 4-5 as specified, go to PINPOINT TEST VREF.

3) Turn ignition off. Install BOB, leaving PCM disconnected. Inspect TP wire for continuity or shorts to ground. If wire is okay, replace TP sensor. Repair wire as necessary.