Circuit Description
This chart assumes that battery condition and engine cranking speed is OK. The quantity and quality of fuel is OK and the glow plug system is operating properly.
Diagnostic Aids
If no trouble is found and the cause of an Engine Cranks But Does Not Run has not been found, check for the following conditions:
| • | Proper cranking speed, 100 RPMs cold - 180 RPMs hot (a scan tool can be used to check cranking speed by pulling the FUEL SOL fuse and monitoring engine speed on scan tool while cranking) |
| • | Water or foreign material in fuel system |
| • | Basic engine problem |
If the crankshaft position (CKP) sensor and the optical/fuel temperature sensor are disconnected or malfunctioning at the same time, an Engine Cranks But Does Not Run condition will exist.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step checks for proper cranking speed (see Diagnostic Aids).
-
This step will check the ground wire on the injection pump (wire located on top of pump).
-
This step will determine if the injection pump or wiring is at fault.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||
1 |
Important: Before clearing DTCs use the Scan Tool Capture Info to record Freeze Frame/Failure Records for reference, as data will be lost when Clear Info function is used. Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |
2 | Check for proper condition of batteries. Refer to Battery Inspection/Test in Engine Electrical. Is the condition of the batteries OK? | -- | Go to Step 3 | Go to Step 22 |
3 | Check for adequate fuel in the tank. Is the fuel at an adequate level? | -- | Go to Step 4 | Go to Step 22 |
4 | Check the quality of the fuel. Refer to Contaminants-in-Fuel Diagnosis . Is the fuel quality OK? | -- | Go to Step 5 | Go to Step 22 |
5 | Check the glow plug system operation. Refer to Glow Plug System Diagnosis . Are the glow plugs operating OK? | -- | Go to Step 6 | Go to Step 22 |
Check for the proper cranking speed. Refer to Diagnostic Aids. Is the cranking speed OK? | -- | Go to Step 7 | Go to Step 22 | |
7 | Check the fuel supply system. Refer to Fuel System Diagnosis . Does the fuel system operate properly? | -- | Go to Step 8 | Go to Step 22 |
Check the injection pump ground wire (located on top of the injection pump). Is the ground OK? | -- | Go to Step 9 | Go to Step 22 | |
9 | Install a scan tool. Does the scan tool display data? | -- | Go to Step 10 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications |
10 |
Does the VTD Fuel Disabled parameter display Active while the engine is being cranked? | -- | Go to Diagnostic System Check - Theft Deterrent in Theft Deterrent | Go to Step 11 |
11 |
Is there fuel at each injection line? | -- | Injection System is OK | Go to Step 12 |
Disconnect the optical/fuel temperature sensor. Does the vehicle start? | -- | Go to Step 16 | Go to Step 13 | |
Is the voltage more than or equal to the specified value? | 1.2 V | Go to Step 14 | Go to Step 17 | |
14 |
Does the test lamp illuminate? | -- | Go to Step 15 | Go to Step 18 |
15 |
Does the test lamp illuminate? | -- | Go to Step 16 | Go to Step 20 |
16 | Replace fuel injection pump. Refer to Fuel Injection Pump Replacement . Did you complete the replacement? | -- | Go to Step 24 | -- |
17 | Check the fuel injection control circuit for an open or short to ground between the fuel solenoid driver and the PCM. Was a problem found? | -- | Go to Step 21 | Go to Step 19 |
18 | Check the closure ground circuit for an open between the fuel solenoid driver and the PCM. Was a problem found? | -- | Go to Step 21 | Go to Step 19 |
19 | Inspect the fuel solenoid driver connector and the PCM connector for a proper connection. Was a problem found? | -- | Go to Step 21 | Go to Step 23 |
20 | Repair the open in the ignition 1 voltage circuit. Did you complete the repair? | -- | Go to Step 24 | -- |
21 | Repair the circuit as necessary. Did you complete the repair? | -- | Go to Step 24 | -- |
22 | Make the appropriate repairs. Did you complete the repair? | -- | Go to Step 24 | -- |
23 | Replace the PCM. Refer to Powertrain Control Module Replacement . Did you complete the replacement? | -- | Go to Step 24 | -- |
24 |
Does the engine start and continue to run? | -- | Go to Step 25 | Go to Step 2 |
25 | Using the scan tool, select Capture Info, Review Info. Are any DTCs displayed that have not been diagnosed? | -- | System OK | |
