Pinpoint Test TP - 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.
TP CIRCUIT PIN IDENTIFICATION
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| TP | 2M | 47 | LT GRN/WHT |
| SIGRTN | 2D | 46 | YEL/GRN |
| VREF | 2K | 26 | LT GRN/RED |
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 below. If output voltage is not within specification, go to next step.
TP SENSOR OUTPUT VOLTAGE
| Throttle Opening | (1) Voltage | ||
|---|---|---|---|
| 1/4 | 0.5 | ||
| 1/2 | 2.75 | ||
| 3/4 | 3.88 | ||
| Full Open | 5.0 | ||
|
|||
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.