7.3L Diesel

NOTE: Two people are required to perform this procedure.

Perform Key On Engine Off (KOEF) Self-Test while holding the throttle wide open (WOT).
After last service code has been displayed, remain in Self-Test.
While in Self-Test, place 0.515 inch gauge block (Rotunda number T83T-7B200-AH) between the fuel pump lever travel screw and the Gauge Boss.
Cycle the Overdrive Cancel Switch (OCS) once.
Observe Self-Test Output (STO) of Star tester for:
- Constant Tone, Solid Light, or "STO LO" readout means the TP sensor adjustment is within range, cycle to get out of this test.
- Beeping Tone, Flashing light, or "STO LO" erratic readout (4 per second) adjustment is required.
- Beeping Tone, Flashing light, or "STO LO" erratic readout (1 per second) adjustment is required.
If tone is undetectable, TP sensor may have worn internal substrate. Check by trying to move sensor.
If TP sensor and bracket screws are tight and there are no signs of wear between the mounted parts, loosen TP sensor attachment screws and rotate sensor one way or the other until a constant tone, solid light, or "STO LO" readout is obtained. Tighten TP sensor attachment screws. Remove gauge block; Rerun quick test.
If bracket shows signs of wear due to movement or vibration, remove epoxy from TPS bracket screw heads. Loosen those screws and turn the TPS/bracket assembly to get block. Rerun quick test.
If the service codes are still present or a steady tone cannot be obtained, Replace the TP sensor.

CAUTION: Do not turn the fuel pump lever travel screw. This screw has been preset and should not be tampered with.

TPS VOLTAGE SPECIFICATIONS ⁽¹⁾

Application

Idle

Wide Open Throttle

2.3L

0.20

4.84

2.9L

0.34

4.84

2.9L ⁽²⁾

0.20

4.84

3.0L

0.20

4.84

4.0L

0.20

4.84

4.9L

0.34

4.84

5.0L

0.34

4.84

5.8L

0.34

4.84

7.5L

0.34

4.84

⁽¹⁾	Minimum and maximum specifications are given.

⁽²⁾	Vehicles equipped with mass airflow sensor only.