Engine Cranks But Does Not Run

CIRCUIT DESCRIPTION
This engine is equipped with a distributorless ignition system called the Electronic Ignition (EI) system. The primary circuit of the (EI) system consists of 2 separate ignition coils, an electronic Ignition Control Module (ICM) and a Crankshaft Position (CKP) sensor as well as the related connecting wires and the Ignition Control (IC) portion of the Powertrain Control Module (PCM). Each secondary circuit consists of the secondary winding of the coil, spark plug wires and the spark plugs. Refer to Engine Controls Schematics.


IMPORTANT: The Camshaft Position (CMP) sensor is only used for a misfire detection and is not part of the ignition system.

DIAGNOSTIC AIDS
^ A small amount of resistance in the battery positive voltage circuit to the PCM may cause a no start. Test the battery positive voltage circuit for excessive resistance or corrosion. Refer to Wiring Repairs in Diagrams.
^ The PCM grounds will cause a NO START only if all of them are not making a good connection. Refer to Testing for Intermittent and Poor Connections in Diagrams. Test/inspect the throttle position (TP) sensor for the following conditions:
- Binding
- Sticking
- Intermittently shorted
- Intermittently open
^ The ECT may be skewed within specifications and not set a code. On a cold vehicle the ECT and IAT should be 30°C or 5°F of each other. On a HOT vehicle let cool to ambient temperature then test.
^ The MAP sensor may be skewed within specifications and not set a code. Refer to DTC P0105 Manifold Absolute Pressure (MAP) Sensor Performance/Range for diagnostic testing. P0105

If the CKP sensor is loose it may cause an intermittent NO START by moving away from the reluctor wheel. Inspect the sensor and matting surface for being clean and tight.

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. If the engine starts, the problem could be intermittent. Basic engine mechanical problems, the Vehicle Theft Deterrent (VTD) system (if equipped) and poor connections could cause a no start condition.
3. This step will determine if the cause of the no start or start and stall is related to the VTD.
5. If the signal is over 2.5 volts, the engine may be in the Clear Flood Mode which will cause starting problems.
6. If the engine coolant sensor is below -30°C (-22°F), the PCM provides fuel for this extremely cold temperature which will severely flood the engine.
8. Voltage at the spark plug is checked using the spark plug tester tool. No spark indicates a basic ignition problem.
9. This test will determine if there is fuel pressure at the fuel injection unit and holding steady.
11. Use the injector test lamp in order to test the injector circuits. A blinking lamp indicates that the PCM is controlling the injector.