Diagnostic Procedure

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NO. 9 FAST IDLE/RUNS ON (VIN Y) DIAGNOSTIC PROCEDURE

STEP	INSPECTION	RESULTS	ACTION
1	INSPECT COOLING SYSTEM FOR MALFUNCTION Access the ECT PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (VIN Y)] ). Start the engine and warm it up completely. Is the ECT PID value between 82-112 °C {180-234 °F}?	Yes	Go to the next step.
1		No	ECT PID value is higher than 112 °C {234 °F}: Perform the symptom troubleshooting "NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING". (See NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING [VIN Y] .) ECT PID value is less than 82 °C {180 °F}: Perform the symptom troubleshooting "NO. 18 COOLING SYSTEM CONCERNS-RUNS COLD". (See NO. 18 COOLING SYSTEM CONCERNS-RUNS COLD [VIN Y] ).
2	VERIFY PCM DTC Retrieve PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (VIN Y)] ). Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (VIN Y)] ).
2		No	Go to the next step.
3	VERIFY CURRENT INPUT SIGNAL STATUS CAUTION: While performing this step, always operate the vehicle in a safe and lawful manner. When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the MMDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later. Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [PCM (VIN Y)] ). APP1 APP2 ECT O2S11 O2S12 SHRTFT1 LONGFT1 Do the PIDs indicate the correct values under the trouble condition? (See PCM INSPECTION [VIN Y] ).	Yes	Go to the next step.
3		No	APP1, APP2 PIDs are not as specified: Inspect the APP sensor. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [VIN Y] .) ECT PID is not as specified: Inspect the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [VIN Y] .) O2S11, SHRTFT1, LONGFT1 PIDs are not as specified: Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [VIN Y] .) O2S12 PID is not as specified: Inspect the HO2S. (See HEATED OXYGEN SENSOR (HO2S) INSPECTION [VIN Y] ). Repair or replace the malfunctioning part according to the inspection results. If the malfunction remains: Inspect communication error between TCM and PCM. Repair or replace the malfunctioning part according to the inspection results if necessary. Perform the "INTERMITTENT CONCERN TROUBLESHOOTING" procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [VIN Y] ).
4	DETERMINE IF MALFUNCTION CAUSE IS A/C REQUEST SIGNAL OR OTHER Access the AC_REQ PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (VIN Y)] ). Monitor the AC_REQ PID while turning on and off the air conditioner with switch on the control panel. Does the AC_REQ PID value change from on to off according to switch control panel?	Yes	Go to the next step.
4		No	If the AC_REQ PID is always ON: Perform the symptom troubleshooting "A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY". (See A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [FULL-AUTO AIR CONDITIONER] .) (See A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [MANUAL AIR CONDITIONER] .) If the AC_REQ PID is always OFF: Perform the symptom troubleshooting "A/C DOES NOT WORK SUFFICIENTLY". (See A/C DOES NOT WORK SUFFICIENTLY [FULL-AUTO AIR CONDITIONER] .) (See A/C DOES NOT WORK SUFFICIENTLY [MANUAL AIR CONDITIONER] ).
5	DETERMINE IF MALFUNCTION CAUSE IS DRIVE-BY-WIRE CONTROL SYSTEM OR OTHER Will the engine run smoothly at part throttle?	Yes	Go to Step 7.
5		No	Go to the next step.
6	INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION Perform the Electronic Control Throttle Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [VIN Y] ). Does the drive-by-wire control system work properly?	Yes	Visually inspect the throttle body (damage/scratching). If there is any malfunction: Repair or replace the malfunctioning part according to the inspection results. If there is no malfunction: Go to the next step.
6		No	Repair or replace the malfunctioning part according to the inspection results.
7	INSPECT FUEL INJECTOR OPERATION Perform the Fuel Injector Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [VIN Y] ). Do the fuel injectors operate properly?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning part according to the inspection results.
8	INSPECT HIGH PRESSURE FUEL PUMP Inspect the high pressure fuel pump. (See HIGH PRESSURE FUEL PUMP INSPECTION [VIN Y] ). Is there any malfunction?	Yes	Replace the high pressure fuel pump. (See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [VIN Y] ).
8		No	Go to the next step.
9	INSPECT CRUISE CONTROL SYSTEM Inspect the operation of cruise control system. Does the cruise control system work properly?	Yes	Go to the next step.
9		No	Repair or replace the malfunctioning part according to the inspection results.
10	INSPECT INTAKE-AIR SYSTEM FOR AIR LEAKAGE Inspect for leakage in intake-air system. Is there any leakage?	Yes	Repair or replace the malfunctioning part according to the inspection results.
10		No	Injector driver malfunction. Replace the PCM. (See PCM REMOVAL/INSTALLATION [VIN Y] ). If the problem remains, overhaul the engine.
11	Verify the test results. If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [VIN Y] ). If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If the vehicle is repaired, troubleshooting is completed. If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.