Diagnostic Test

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

CHECK FOR AN ACTIVE DTC
NOTE:
Low battery voltage can cause excessive current draw in very hot and very cold ambient temperatures. Look closely at the temperatures at which this DTC set and make sure the battery can pass a load test before continuing.

NOTE:
Diagnose and repair any other DTCs set in the PCM before proceeding with this test.
1. Turn the ignition on.
2. With the scan tool, read DTCs and review the DTC environmental information.
  Is the good trip counter greater than 0?
  
  Yes
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
  No
  - Go To 2
THROTTLE PLATE INSPECTION
1. Turn the ignition off.
2. Remove the air cleaner assembly.
3. Check for any signs of a foreign material (ice, dirt, or excessive carbon build up) on the throttle plate or in the bore causing the throttle plate to stick.
  Were any problems found?
  
  Yes
  - Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. Repair or replace the Throttle Body Assembly if no problems were found in the connectors. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. Refer to THROTTLE BODY, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
DIRTY AIR FILTER
1. Remove and inspect the air filter.
  Were any problems found?
  
  Yes
  - Replace the air filter.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CONTAMINATED FUEL
1. Inspect the fuel for contamination. (dirt, water, or other foreign material)
  Were any problems found?
  
  Yes
  - Drain the fuel from the fuel tank into an approved gas holding tank and add clean fuel. Refer to DRAINING FUEL TANK .
  No
  - Go To 5
CHECK FOR EXCESSIVE RESISTANCE IN THE (K447) ETC MOTOR (+) CIRCUIT
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
  CAUTION:
  Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the GPEC Diagnostic Adaptor to perform the diagnosis.
3. Connect the (special tool #10436, Adapter, GPEC Diagnostic) in line with the PCM C2 harness connector.
4. Using a voltmeter, perform a voltage drop test by back probing the (K447) ETC Motor (+) circuit at the Throttle Body harness connector and the GPEC Adaptor. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter.
  WARNING:
  When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in possible serious or fatal injury.
5. Start the engine.
  Is the voltage below 0.2 volts?
  
  Yes
  - Go To 6
  No
  - Repair the (K447) ETC Motor (+) for excessive resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK FOR EXCESSIVE RESISTANCE IN THE (K448) ETC MOTOR (-) CIRCUIT
1. Turn the ignition off.
2. Move the Voltmeter leads to back probe the (K448) ETC Negative circuit at the Throttle Body harness connector and the GPEC Adaptor. Make sure the Voltmeter leads are connected so a positive polarity is displayed on the Voltmeter.
  WARNING:
  When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.
3. Start the engine.
  Is the voltage below 0.2 volt?
  
  Yes
  - Go To 7
  No
  - Repair the (K448) ETC Motor (-) for excessive resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
THROTTLE BODY
1. Turn the ignition off.
2. Disconnect the C2 PCM harness connector.
3. Measure the resistance of the ETC Motor by probing the GPEC Adaptor at the (K447) ETC Motor (+) circuit and the (K448) ETC Motor (-) circuit.
  Is the resistance between 2.5 and 25 Ohms at closed throttle?
  
  Yes
  - Go To 8
  No
  - Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. Replace the Throttle Body Assembly if no problems were found in the connectors. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. Refer to THROTTLE BODY, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Perform any Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .