Diagnostic Test

ACTIVE DTC
1. Ignition on, engine not running.
  NOTE: Low battery voltage can also cause excessive current draw, in very hot and very cold ambient temperatures. Make sure the battery can pass a load test before continuing.
2. With a scan tool, read DTCs.
3. Diagnose any other PCM DTCs before continuing.
4. Look closely at the temperatures at which this DTC set.
  Is the DTC active at this time?
  
  Yes
  - Go to step 2
  No
  - Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
THROTTLE PLATE INSPECTION
1. Turn the ignition off.
2. Remove the Air Cleaner Assembly from the Throttle Body.
3. Check for any broken components in the Throttle Body.
4. 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 signs of foreign material or scoring of the throttle plate or bore found?
  
  Yes
  - Remove the debris if possible or replace the Throttle Body Assembly as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 3
DIRTY AIR FILTER
1. Remove and inspect the Air Filter.
  Is the Air Filter dirty?
  
  Yes
  - Replace the Air Filter.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Go to step 4
CONTAMINATED FUEL
1. Inspect the Fuel for contamination. (Dirt, water, or other foreign material)
  Is the fuel contaminated?
  
  Yes
  - Drain the Fuel from the fuel tank into an approved gas holding tank and add clean fuel. Refer to Fuel System/Fuel Delivery - Standard Procedure
  No
  - Go to step 5
EXCESSIVE RESISTANCE IN THE (K961) IAC SIGNAL CIRCUIT
1. Turn the ignition off.
2. Disconnect the 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 PCM Pinout Box 8815 along with the Adapter 8815-1 to perform the diagnosis.
3. Using a voltmeter perform a voltage drop test. Backprobe the (K961) IAC Signal circuit at the IAC harness connector and probe the appropriate terminal of the special tool #8815. 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.
4. Start the engine and allow it to reach normal operating temperature.
5. Monitor the voltmeter.
  Is the voltage below 0.5 of a volt?
  
  Yes
  - Go to step 6
  No
  - Repair the excessive resistance in the (K961) IAC Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
EXCESSIVE RESISTANCE IN THE (K61) IAC CONTROL CIRCUIT
1. Turn the ignition off.
2. Move the voltmeter leads to backprobe the (K61) IAC Control circuit at the IAC harness connector and to probe the appropriate terminal of the special tool #8815. 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 and allow it to reach normal operating temperature.
4. Monitor the voltmeter.
  Is the voltage below 0.5 of a volt?
  
  Yes
  - Go to step 7
  No
  - Repair the excessive resistance in the (K61) IAC Control circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
IAC MOTOR
1. Turn the ignition off.
2. Disconnect the IAC Motor harness connector.
3. Remove special tool #8815 and #8815-1.
4. Connect the C2 PCM harness connector.
5. Remove the IAC Motor.
  NOTE: Inspect the IAC air passages for restrictions and damage to the IAC valve and clean as necessary.
6. Measure the resistance across the IAC Motor pin terminals (component).
  Is the resistance 9.7 +/- 1.0 ohms?
  
  Yes
  - Go to step 8
  No
  - Replace the IAC Motor.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
1. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  No
  - Replace and program the Powertrain Control Module per Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure