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Diagnostic Procedure

NO. 10 LOW IDLE/STALLS DURING DECELERATION DIAGNOSTIC PROCEDURE

STEP INSPECTION RESULTS ACTION
1 VERIFY IF MALFUNCTION INCLUDES ROUGH IDLING
  • Does the engine idle roughly?
 Yes Go to the symptom troubleshooting "NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE".
(See NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE .)
No Go to the next step.
2 DETERMINE IF MALFUNCTION CAUSE IS A/C SYSTEM OR OTHER
  • Turn off the A/C switch and fan switch.
  • Does the A/C magnetic clutch engage?
 Yes Go to the symptom troubleshooting "NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY."
(See NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY .)
No Go to the next step.
3 INSPECT INTAKE AIR SYSTEM FOR AIR LEAKAGE
  • Inspect the following:
  • Proper routing of and no damage to the vacuum lines
  • No air leakage from the intake air system
    • Engine mount loose
  • Is there any malfunction?
 Yes Repair or replace the malfunctioning part according to the inspection results.
No Go to the next step.
4 VERIFY PCM DTC
 Yes Go to the applicable DTC inspection.
(See DTC TABLE .)
No Go to the next step.
5 INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION
 Yes Repair or replace the malfunctioning part according to the inspection results.
No Go to the next step.
6 DETERMINE IF MALFUNCTION CAUSE IS EVAP CONTROL SYSTEM OR OTHER
  • Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from purge solenoid valve side.
  • Plug the open end of the vacuum hose.
  • Drive the vehicle.
  • Does the engine condition improve?
 Yes Inspect the EVAP control system.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION .)
Repair or replace the malfunctioning part according to the inspection results.
No Go to the next step.
7 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 M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.
  • APP1
  • APP2
  • BOO
  • TP1
  • TP2
  • MAF
  • O2S11
    • VSS
  • Do the PIDs indicate the correct values under the trouble condition? (See PCM INSPECTION .)
 Yes Go to the next step.
No APP1, APP2 PIDs are not as specified:

BOO PID is not as specified:

TP1, TP2 PIDs are not as specified:

MAF PID is not as specified:

O2S11 PID is not as specified:

VSS PID is not as specified:

Repair or replace the malfunctioning part according to the inspection results.
8 VERIFY CURRENT INPUT SIGNAL STATUS
  • AC_REQ
  • CPP (MTX)
  • CPP/PNP (MTX)
    • TR (ATX)
 Yes ATX:
  • If there is any malfunction:
    • Repair or replace the malfunctioning part according to the inspection results.

MTX:
  • Go to the next step.
No AC_REQ PID is not as specified:

CPP PID is not as specified: (MTX)

CPP/PNP PID is not as specified: (MTX)

TR PID is not as specified: (ATX)

Repair or replace the malfunctioning part according to the inspection results.
9 Verify test results.
  • If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX .)
  • 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.
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