Symptom Related Diagnostic Procedures

*ENGINE CRANKS BUT DOES NOT START











Diagnostic Test

1. NO START PRE-TEST





NOTE: The following list of items must be checked before continuing with any no start tests.

The battery must be fully charged and in good condition. A low charged battery may produce invalid test results. If the battery is low, charge the battery and then attempt to start the vehicle by cranking the engine for 15 seconds, 3 consecutive times.

This will allow any DTCs to set that may have been erased due to a dead battery.

Try to communicate with the PCM. If not able to communicate, check fuses.

Ensure the Power and Ground to the PCM are OK.

Make sure the PCM communicates with the DRB III(R) and that there are no DTCs stored in the PCM memory. If the PCM reports a No Response condition refer to Manufacturer Trouble Codes for the proper tests.

Read the PCM DTCs with the DRB III(R). If any DTCs are present, they must be repaired before continuing with any other No Start diagnostic tests.

Ensure that the Bus is functional. Attempt to communicate with the Instrument Cluster and Sentry Key Remote Entry Module (SKREEM). If you are unable to establish communications, refer to Manufacturer Trouble Codes for the proper diagnostics.

The SKREEM System must be operating properly. Check for proper communication with the DRB III(R) and check for DTCs that may be stored in the SKREEM. Repair the DTC(s) before continuing.

Verify that the fuel tank is not empty before continuing.

Crank the engine several times. Using the DRB III(R), read PCM DTCs. If a DTC is present, perform the DTC diagnostics before continuing.

Were any problems found?

Yes

- Repair as necessary.
- Perform POWERTRAIN VERIFICATION TEST - VER 1. Powertrain Verification Test - Ver 1

No

- Go To 2

2. OPEN FUSE

Turn the ignition off.

Check for open fuses.

Are there any open fuses?

Yes

- Replace the open fuse and check the related circuit(s) for a short to ground.
- Perform POWERTRAIN VERIFICATION TEST - VER 1. Powertrain Verification Test - Ver 1

No

- Go To 3

3. POSSIBLE MECHANICAL PROBLEMS

Turn the ignition off.

Check for any of the following conditions/mechanical problems.

ENGINE VALVE TIMING - must be within specifications, check for broken timing components

ENGINE COMPRESSION - must be within specifications

ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks.

Are there any engine mechanical problems?

Yes

- Repair as necessary.
- Perform POWERTRAIN VERIFICATION TEST - VER 1. Powertrain Verification Test - Ver 1

No

- Go To 4

4. FUEL PUMP RELAY OUTPUT CIRCUIT OPEN





With the ignition off.

Disconnect the Fuel Pump harness connectors.

NOTE: Check connectors - Clean/repair as necessary.

Verify the Fuel Pump Relay is getting voltage on the Fused Engine Control Relay Output circuit and Fused B(+) circuit before continuing.

Measure the resistance of the Fuel Pump Relay Output circuit from the Relay Control Module B harness connector to the Fuel Pump harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 5

No

- Repair the Fuel Pump Relay Output circuit for an open.
- Perform POWERTRAIN VERIFICATION TEST - VER 1. Powertrain Verification Test - Ver 1

5. FUEL PUMP DELIVERY

With the ignition off.

Follow the diagnostics for Checking Fuel Delivery of this manual.

Was the No Start condition solved after following the above diagnostic test?

Yes

- Test Complete.

No

- Check for contamination/water in the fuel. Ensure the fuel being used in this vehicle meets manufacturer's Fuel Requirement.
- Perform POWERTRAIN VERIFICATION TEST - VER 1. Powertrain Verification Test - Ver 1