Circuit Description
This chart assumes that battery condition and engine cranking speed is OK, quantity and quality of fuel is OK and glow plug system is operating OK.
Diagnostic Aids
If no trouble is found and the cause of an Engine Cranks But Will Not Run has not been found, check for:
| • | 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 sensor and the Optical/Fuel Temperature are disconnected or faulty at the same time, a Engine Cranks But Will Not Run condition will exist.
Test Description
Number(s) below refer to the step number(s) 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 | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Important: Before clearing DTC(s) use the Scan Tool Capture Info to record freeze frame and failure records for reference, as data will be lost when Clear Info function is used. Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||
2 | Check for proper condition of batteries. Refer to Engine Electrical. Is condition of batteries OK? | -- | ||
3 | Check for adequate fuel in tank. Is fuel at a adequate level? | -- | ||
4 | Check the quality of fuel. Refer to Fuel System Contamination. Is fuel quality OK? | -- | ||
5 | Check glow plug system operation. Refer to Glow Plug System. Are glow plugs operating OK? | -- | ||
Check for proper cranking speed. Refer to Engine Electrical. Is cranking speed OK? | -- | |||
7 | Check for a restriction in the fuel return system. Refer to Fuel System. Does the fuel return system operate properly? | -- | ||
Check injection pump ground wire. Is ground OK? | -- | |||
9 | Ignition ON. Does MIL come ON? | -- | Go to Table A-1 | |
10 | Install scan tool. Does scan tool display data? | -- | Go to Table A-2 | |
11 |
Is there fuel at injection line? | -- | ||
Disconnect Optical/Fuel temperature sensor. Does vehicle start? | -- | |||
13 |
Is voltage greater than or equal to specified value? | 1.2 V | ||
14 |
Is test light ON? | -- | ||
15 |
Is test light ON? | -- | ||
16 | Replace fuel injection pump. Refer to Fuel Injection Pump Replacement Is the action complete? | -- | -- | |
17 | Injection system OK. Refer to Diesel Driveability. | -- | -- | -- |
18 | Check the fuel inject control circuit for an open or ground between the fuel solenoid driver and the PCM. Was a problem found? | -- | ||
19 | Check the closure ground circuit for an open between the fuel solenoid driver and the PCM. Was a problem found? | -- | ||
20 | Inspect the fuel solenoid driver connector and PCM connector for proper connection. Was a problem found? | -- | ||
21 | Repair the open in the ignition feed circuit. Is the action complete? | -- | -- | |
22 | Repair the circuit as necessary. Is the action complete? | -- | -- | |
23 | Make appropriate repairs. Is the action complete? | -- | -- | |
24 | Replace the faulty PCM. Important: If the PCM is faulty, the new PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming Is the action complete? | -- | -- | |
25 |
Does the engine start and continue to run? | -- | ||
26 |
Are any DTCs displayed? | -- | -- | |
27 | Using the Scan Tool, select Capture Info, Review Info. Are any DTCs displayed that have not been diagnosed? | -- | Go to the Applicable DTC Table | System OK |
