Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
NOTE:
This diagnostic assumes the following:
- The battery is completely charged.
- The engine cranking speed is acceptable.
- There is adequate fuel in the fuel tank.
- Crank the engine for up to 15 s.
- Verify that DTC P0117, P0118, P0122, P0123, P018C, P018D, P0222, P0223, P0231, P0232, P023F, P025A, P0335, P0336, P0513, P0562, P0563, P0601, P0602, P0603, P0604, P0606, P0628, P0629, P062F, P0633, P0685, P0689, P0690, P1516, P1631, P1682, P16F3, P2101, P2119, or P2610 are not set.
- If any of the DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If none of the DTCs are set
- If any of the DTCs are set
- Ignition ON
- Verify the security indicator on the instrument cluster illuminates momentarily.
- If the security indicator stays ON or is flashing
Review the Diagnostic Trouble Code (DTC) List - Vehicle , for Immobilizer system DTCs. For additional information, refer to Immobilizer Description and Operation .
- If the security indicator does not stay ON and is not flashing
- If the security indicator stays ON or is flashing
- Verify the scan tool Engine Speed parameter displays greater than 0 rpm while cranking the engine.
- If 0 rpm
Refer to DTC P0335 or P0336 .
- If greater than 0 rpm
- If 0 rpm
- Install the EN 36012-A Ignition System Diagnostic Harness to the spark plug boots.
- Connect the EL 26792 Spark Tester between the boot of a spark plug wire and ground.
- Connect the remaining wires to the appropriate cylinders.
- Verify the spark tester sparks while cranking the engine.
- If the spark tester does not spark
Refer to Electronic Ignition System Diagnosis for diagnosis of the ignition coil.
- If the spark tester sparks
- If the spark tester does not spark
- Ignition OFF, all accessories OFF, install the CH 48027 Digital Pressure Gauge.
- Ignition ON.
- Command the Fuel Pump Enable ON several times with a scan tool.
- Verify that the fuel pressure is between 345-650 kPa (50-94 PSI) with the fuel pump running.
- If not within the specified range
Refer to Fuel System Diagnosis .
- If within the specified range
- If not within the specified range
- Verify that the fuel pressure does not decrease greater than 34 kPa (5 PSI) in 1 minute.
- If not within the specified range
Refer to Fuel System Diagnosis .
- If within the specified range
- If not within the specified range
- Ignition OFF, disconnect the harness connector at a Q17 Fuel Injector.
- Connect the J 34730-2C Injector Test Lamp between the control circuit and the ignition voltage circuit.
- Verify the injector test lamp flashes while cranking the engine.
- If the injector test lamp does not flash
Refer to Fuel Injector Diagnosis .
- If the injector test lamp flashes
- If the injector test lamp does not flash
- Verify the following conditions do not exist:
- Air intake duct to the throttle body collapsed
- Air filter or air intake system restricted
- Gas or coolant fouled spark plugs. Refer to Spark Plug Inspection .
- A skewed manifold absolute pressure (MAP) sensor.
- A skewed engine coolant temperature (ECT) sensor.
- Exhaust system restricted. Refer to Restricted Exhaust .
- Contaminated fuel. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
- An engine mechanical condition, for example, worn timing belt or low compression. Refer to Symptoms - Engine Mechanical .
- If a condition exists
Repair as necessary.
- If no condition exists
- All OK.
NOTE:
It may be necessary to secure the EN 36012-A to the spark plug boots with electrical tape.
NOTE:
An erratic or weak spark is considered a no spark condition.
NOTE:
Do not start the engine for this test.