Description
This table assumes that the battery condition and the engine cranking speed are OK. If not, refer to Diagnostic Starting Point for diagnosis. Also, make sure that there is adequate fuel in the tank.
Diagnostic Aids
Notice: Use the connector test adapter kit J 35616-A for any test that
requires probing the following items:
• The PCM harness connectors • The electrical center fuse/relay cavities • The component terminals • The component harness connector
| • | Unless the engine enters Clear Flood at the first indication of a flooding condition, a no start may result. |
| • | Check the duct work between the mass air flow (MAF) sensor and the throttle body for air leaks. |
| • | A malfunctioning MAF sensor may cause a no start or a stall after start. If this is suspected, disconnect the MAF sensor. The PCM will ignore the MAF sensor and default to calculated air flow. If this corrects the condition and the connections are OK, replace the MAF sensor. |
| • | If the steps above check OK, refer to Hard Start in Symptoms for diagnosis. |
| • | If the problem is intermittent, refer to Intermittent Conditions . |
Test Description
The numbers below refer to step numbers on the diagnostic table.
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These DTCs are for systems/components which if operating improperly may cause a no-start.
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If the fuel pump is not audible at the fuel tank area, listen underhood at the fuel rail. Fuel flowing through the pressure regulator produces an audible hiss.
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The Fuel System Pressure Test contains the correct procedures and specifications for checking the fuel pressure. If a problem is found, continue diagnosis in the Fuel System Pressure Test.
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Hard Start in Symptoms contains more detailed information as well as additional diagnostic aids.
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Recheck the system for any multiple problems that may be related (for example, fouled spark plugs that were caused by a fuel system problem). Certain engine mechanical problems such as incorrect cam timing, low compression etc., could cause the engine to crank but not start. If this is suspected, refer to Engine Compression Test in Engine Mechanical.
Step | Action | Values | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||||||||||
2 | Is the Malfunction Indicator Lamp (MIL) on with the key On and the engine off? | -- | ||||||||||
Check for any DTCs with the scan tool. Are any of the following DTCs displayed: P0230, P0335, P0385, P0560, P0601, P0602, P1404, P1626, P1631, P1635, P1639? | -- | Go to the applicable DTC table | ||||||||||
4 |
Important: If the engine cranks and does not run, test the ignition relay feed circuits to and from the ignition relay. Refer to Power Distribution Schematics and Circuit Testing in Wiring Systems. Check the fuses that supply power to the Fuel Injectors and the Ignition Control Modules. Is a fuse open? | -- | ||||||||||
5 | Check the Engine Coolant Temperature with the scan tool. Is the Engine Coolant Temperature on the scan tool close to the actual engine coolant temperature? | -- | ||||||||||
6 | Check the TP Angle with the scan tool. Is the TP Angle more than the value specified at closed throttle? | 2% | ||||||||||
Turn OFF the ignition and wait 15 seconds. Turn ON the ignition. The PCM should enable the fuel pump for about 2 seconds. The fuel pump can also be enabled using the scan tool. Does the fuel pump operate? | -- | |||||||||||
Was a problem found? | -- | Go to Fuel System Diagnosis | ||||||||||
Perform the following additional checks:
Was a problem found and corrected? | -- | Go to Hard Start in Symptoms for diagnosis | ||||||||||
10 | Check for a incorrectly calibrated ECT sensor. If the vehicle is completely cool after sitting overnight, the ECT and the IAT should be within a few degrees of each other. The sensor can also be checked using the Temperature vs Resistance table. Is the action complete? | -- | -- | |||||||||
11 | Check for an incorrectly calibrated TP sensor. TP Angle should be near 0 percent at closed throttle and near 100 percent at WOT and increase smoothly as the throttle is slowly opened. If TP Angle is not indicating closed throttle with no pressure on the accelerator pedal, check for a sticking or binding mechanism and correct as neccessary. If a spike or dropout occurs while sweeping the TP sensor through the operating range, check the connections at the sensor. If the connections are OK replace the sensor. For additional information, refer to DTC P0121. Is the action complete? | -- | -- | |||||||||
12 | Repair the Ignition 1 power circuit to the PCM. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |||||||||
13 |
Is the action complete? | -- | -- | |||||||||
Does the engine start and continue to run? | -- | Refer to Test Description . | ||||||||||
15 |
Are there any DTCs displayed? | -- | Go to the applicable DTC table | |||||||||
16 | Were there any additional DTCs noted during the Powertrain OBD System Check that have not been diagnosed? | -- | Go to the applicable DTC table | System OK |
