Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.

NOTE:

This diagnostic assumes the following:

Crank the engine for up to 15 s.
Verify that P0201 - P0204, P0230, P0231, P0232, P023F, P025A, P0335, P0336, P0351 - P0354, P0601, P0602, P0603, P0604, P0606, P0607, P060E, P062F, P0685, P0689, P0690, P069E, P1516, P1682, P2610 or P2635 is not set.
- If any of the DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If none of the DTCs are set
Ignition ON.
Verify the security indicator on the instrument panel cluster illuminates momentarily.
- If the indicator stays ON or is flashing
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle and Immobilizer Description and Operation
- Go to next step: If the indicator does not stay ON and is not flashing
Verify the scan tool Engine Speed parameter is greater than 0 RPM while cranking the engine.
- If 0 RPM
  Refer to DTC P0335 or P0336 for further diagnosis.
- Go to next step: If greater than 0 RPM
Ignition OFF.
Disconnect the T8 ignition coil from a cylinder and spark plug.
Connect a J 26792 HEI Spark Tester between the boot of the ignition coil and ground.

NOTE:

An erratic or weak spark is considered a no spark condition.

Verify that the spark tester sparks while cranking the engine.
- If the spark tester does not spark
  Refer to Electronic Ignition System Diagnosis for further diagnosis.
- Go to next step: If the spark tester sparks
Ignition ON.

NOTE:

If the engine is too hot, high fuel pressure readings may result due to hot soak fuel boiling. Allow the engine coolant temperature to cool to less than 60° C (150° F) before attempting to verify fuel pressure.
The Fuel Pump Enable may need to be commanded On a few times in order to obtain the highest possible fuel pressure.
Additional DTCs may set when using the fuel pump output control.

Command the Fuel Pump Enable On several times with a scan tool.
Verify that the scan tool Fuel Pressure Sensor parameter is between 345 - 650 kPa (50 - 94 psi) while the fuel pump is running.
- If not within the specified range
  Refer to Fuel System Diagnosis .
- Go to next step: If within the specified range
Verify that the scan tool Fuel Pressure Sensor parameter, after the pump has turned OFF, decreases to less than 600 kPa (87 psi), and does not decrease greater than 34 kPa (5 psi) in 1 minute.
- If not within the specified range
  Refer to Fuel System Diagnosis .
- Go to next step: If within the specified range
Ignition OFF, disconnect the harness connector of a fuel injector.
Connect a test lamp between the control circuit and the ignition voltage circuit of the harness connector.

NOTE:

Perform the fuel injector test on at least 3 fuel injectors

Verify the test lamp flashes while cranking the engine.
- If the test lamp does not flash
  Refer to Fuel Injector Circuit Diagnosis .
- Go to next step: If the test lamp flashes
Verify that the conditions listed below do not exist:
- Collapsed or restricted air intake duct to the throttle body
- Restricted air filter
- Gas or coolant fouled spark plugs
- A skewed manifold absolute pressure (MAP) sensor. Refer to DTC P0106 .
- A skewed engine coolant temperature (ECT) sensor. Refer to DTC P0117, P0118, or P0119 .
- A restricted exhaust system. Refer to Restricted Exhaust .
- Contaminated fuel. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
- An engine mechanical condition, for example, worn timing chain and gears or low compression. Refer to Symptoms - Engine Mechanical , or Engine Compression Test .
  - If a condition exists
    Repair as necessary.
  - Go to next step: If no conditions exist
All OK