I have a 1999 f250 7.3 I was driving down the road today and I lost throttle along with my check engine light coming on. I pulled over and turned my truck off and now it will not fire back up. Any advice ad to what it could be

 

When you crank the engine over does the tach move. If not likely need to replace your CMP.

 

Honestly I didn't check to see if it did or not. Someone else mentioned to me that the injector drive module might be bad.

 

Not likely the IDM start with checking the #30 fuse in the under hood fuse box. Then check the tach for movement. For the truck to shutoff like that it's a good chance it's the CMP(CPS)

 

Well I shut the truck off I just couldn't get it to fire back up

 

if the truck doesn't see a CPS/RPM signal from the CPS, it won't fire the truck.

Do you have access to a scanner? You can watch the ICP build and the IPR move, you can buzz the injectors and ensure the IDM is working, but this little $24 part has stranded many a 7.3, ask me how I know.

I just replaced one last night because my truck was dieing at weird times. Drove today without issue, I hope it's my answer.

It's a 10mm deep socket on a 1/4" Rachet with a 3" extension. Entire job takes 10 min.

You can move the best out of your way to make it easier. Add some dielectric grease to the connector if you can.

 

Here some things you can do to help troubleshoot the issue:

HARD START/NO START DIAGNOSTICS

**NOTE: A hard start/ No start concern with EOT Temp. Below 60F perform step 10 first. You may wish to plug the block heater in for a few hours and see if starting improves.

Tools: Fuel Filter Cap Removal Tool / Flash Light / Tools Flash Light / White Bond Paper / Stop or Wrist Watch w/Second Hand Sweep / DVOM

Step #1: Visual Engine/Chassis Inspection

a. Fuel

b. Oil

c. HPOP Oil Level (.5" - 1" from top is full)

d. Coolant

e. Electrical

f. Hoses Leaks Check

Tools: Flash Light

Fuel Oil Coolant Electrical Hoses Leaks Check

Tools: White Bond Paper

Step #2 Check for:

a. Contaminates

b. Correct Grade and Viscosity

c. Miles/Hours on oil

d. correct level.

Step #3 Intake/Exhaust Restriction

Tools: Flash Light

a. Inspect air filter and ducts

b. Exhaust system

c. Inspect exhaust back pressure device

Step #4 Sufficient Clean Fuel

Tools: Fuel Filter Cap Removal Tool

a. Check if the WATER IN FUEL lamp has been illuminated.

b. After verifying that there is fuel in the tank, drain a sample from fuel filter housing at key on.

c. Fuel pump should run for 20 seconds at key on

Step #5 Electric Fuel Pump Pressure

Tools: DVOM / Fuel Port Adaptor and Pressure Gauge 0-160 PSIG

a. Verify that the fuel pump has voltage and gnd. present at key on.

b. Measure fuel pressure at the Fuel Bowl Test Port key on.

c. Instrument Spec. 42-45 PSIG min at idle. / WOT Under Load =/> 42 PSIG.

* If pressure fails low, go to step 8c on the Performance side of this sheet to identify cause

Step #6 Perform KOEO on Demand Test

Tools: OBD-II On-Board Diagnostics, Phase 2 Vehicle Media Communications Unit (Scanner)

DTCs set during this test are current faults. Make a note of codes for reference. You, may wish to post them on FTE for further assistance.

Note: IDM DTCs displayed here could be current or historical faults a p1316 code indicates there are DTC's stored in the IDM. A suitable Scan Tool will be required to retrieve them. DO NOT Clear the p1316 DTC until they have been retrieved from the IDM.

Step #7 Retrieve Continuous Trouble Codes

Tools: OBD-II On-Board Diagnostics, Phase 2 Vehicle Media Communications Unit (Scanner)

DTCs retrieved during this test are historical faults. * Note: IDM DTCs are cleared when codes are cleared.

Step #8 KOEO Injector Electrical Self-Test

Tools: Bi-Directional Scan Tool.
KOEO Injector Electrical Self-Test
** DO NOT CLEAR CODES PRIOR TO THE KOEO Injector Electrical Self-Test **

Tools: OBD-II On-Board Diagnostics, Phase 2 Vehicle Media Communications Unit (Scanner)

1. All injectors will momentarily buzz, then individual injectors will buzz in sequence 1 through 8.

2. IDM ** DTCs may be transmitted after test is completed**. Record and post to Forum for further direction.

Note: IDM DTCs may be historical if not cleared above note anomalies in sound and identify weak or no sound solenoids.

3. All injectors will momentarily buzz, then individual injectors will buzz in sequence 1 through 8. IDM DTCs may be transmitted after test is completed.

4. Note: IDM DTCs may be historical if not cleared prior to activating the "Buzz-Test".

Step #9 Data List Monitoring

Tools: OBD-II On-Board Diagnostics, Phase 2 Vehicle Media Communications Unit (Scanner)

1. Select the parameters indicated from the NGS parameter list and monitor while cranking engine.

Parameter/Spec:

a. V PWR / 10.5 volt min (The CMP may fall out of the PCM circuit if voltage falls below 10.5v).

b. RPM / 100-150 RPM minimum

c. ICP / 500 PSI or 3.4mPa min. The ICP should steadily climb during cranking. This indicates a healthy HPOP depending upon how high it climbs.

d. ICPv / 0.25v – 0.30v

e. FUEL PW / 1 mS to 6mS

f. MAP & EBP should be within .5 PSIG

* V PWR -If indicating a low voltage condition, check battery voltage, charging system or power and ground circuits to the PCM. GO TO
Data List Monitoring Parameter:

V-PWR 10.5 VDC Minimum. (The CMP may fall out of the PCM circuit if vehicle voltage falls below 10.5v).

RPM 100 RPM Minimum (0 - CMP Suspect)

ICP 500 PSI or 3.4 MPAM Minimum the ICP should steadily climb during cranking. This indicates a healthy HPOP depending upon how high it climbs.

ICPv (KOEO) Spec 0.20v - 0.30v

FUEL PW: 1 MS - 6 MS (<1 / >6 IDM Suspect)

V-PWR - If indicating a low voltage condition, check battery voltage,
charging system or power and ground circuits to the PCM.

DC% - Cranking NTE 20% / 65% is closed. (IPR Suspect)

2. RPM - Low RPM could be an indication of starting / charging system problems **

3. No RPM indicated with the engine cranking - could be CMP circuit fault, check for DTC’s.

4. ICP - A minimum of 500 PSI (3.4 mPa) is required before the injectors are enabled. No or low oil in the reservoir, system leakage, injector O-Rings, or faulty IPR could cause pressure loss.

Note: If no RPM signal is received, IPR duty cycle will default to 14%

5. FUEL PW - Even though a 1 to 6 mS FUEL PW is shown, it’s possible the IDM did not receive the signal due to a CI or FDCS circuit fault or internal IDM failure.

6. MAT: Manifold Air Temperature the PCM uses this signal to adjust fuel and timing.

7. VFD (Volume Fuel Desired)

8. MFD (Mass Fuel Desired)

* RPM -Low RPM could be an indication of starting/ charging system problems, RPM indicated with the engine cranking -could be CMP circuit fault, check for Diagnostic Trouble Codes. GO TO PINPOINT TEST DG

*ICP -A minimum of 500 PSI (3.4 mPa) is required before the injectors are enabled. No or low oil in the reservoir, system leakage, injector O-Rings or faulty IPR could cause pressure loss.

*Go to section 4 step 9c in the PC/ED Manual for a detailed description on how to perform this test. Note: If no RPM signal is received, IPR duty cycle will default to 14% - Monitor when cranking.

*FUEL PW -Even though a 1 to 6 mS FUEL PW is shown, it’s possible the IDM did not receive the signal due to a CI or FDCS circuit fault or
Internal IDM failure.

Step #10 Glow Plug System Operation

Tools: DVOM / Stop or Wrist Watch w/Second Hand Sweep

a. Glow Plug ON time is dependent on oil temperature and altitude. The Glow Plug relay comes on between 1 and 120 sec. and does not come on at all if oil temp is above 131 F.

b. Verify that B+ is being supplied on the large BK/W wire going to the Glow Plug relay.

c. Attach voltmeter leads (I like Alligator Clips) to the glow plug feed terminal (two brown wires or center terminal on the shunt) and the other (GP Side) Lug. When key is "ON" you should read approximately 11.5 vdc +/- .5 vdc when GP Relay is activated. A reading closer to system voltage may indicate a defective GP Solenoid or wiring issue.

d. Using a Bi-Directional Scan Tool and EOT PID’s, verify glow plug "on" time.

e. Turn key to run position, measure voltage ("on “time) (Dependent on oil temperature and altitude) Relay on time Spec. Measurement 1 to
120 seconds B +

f. Note: Wait to Start Lamp "on" time (1 -10 sec.) is independent from Glow Plug "on" time

g. Glow Plug Resistance

h. Remove both 9 pin connectors from valve covers • Measure each Glow Plug resistance to Bat. Ground. Measure engine harness resistance to relay. .1 to 2 ohms

i. Glow Plug Connector to relay 0 to 1 ohms

FRONT
#2 #1
#4 #3
#6 #5
#8 #7

*Add 5 seconds to glow plug on time when above 7000 feet in altitude, but not to exceed 120 seconds.